{"id":"CVE-2026-105274","revision":null,"records":[{"revision":"f354464f74a647eaa2855a41a77309ba","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-105274","aliases":[],"title":"hex_core decompresses registry and Erlang term API responses without size limits","description":"Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in hexpm hex_core allows an untrusted repository mirror, or a server answering hex_core's API requests, to exhaust the memory of the Erlang VM running hex_core. The same code is vendored in Hex (mix_hex_repo, mix_hex_api) and rebar3 (r3_hex_repo, r3_hex_api).\n\nhex_repo:get_names/1, hex_repo:get_versions/1, hex_repo:get_package/2 and hex_repo:get_policy/2 decompress the registry response with zlib:gunzip/1 and decode the signed envelope before verifying its signature. A mirror doesn't have the repository's private key, but it chooses the compressed bytes, so a small response decompresses into an envelope of any size before the signature check rejects it.\n\nhex_api decodes responses with the application/vnd.hex+erlang content type through hex_safe_binary_to_term:safe_binary_to_term/1, which calls binary_to_term(Binary, [safe]). The safe option prevents atom creation, but it accepts compressed terms and doesn't limit the size of the decoded term, and the check that rejects functions and ports runs after the term has been built. The fix for CVE-2026-21619 added the safe option and that check without bounding the decoded size.\n\nThis issue affects rebar3: from 3.9.1 before 3.27.3; hex: from 2.1.0 before 2.5.2; hex_core: from 0.1.0 before 0.20.0.","state":0,"publishedAt":"2026-10-12T16:43:58.73+00:00","modifiedAt":"2026-10-15T18:05:12.446+00:00","affected":[{"ecosystem":"Vendor product","name":"rebar3","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"cpes\": [\n                        \"cpe:2.3:a:erlang:rebar3:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"r3_hex_repo\",\n                        \"r3_hex_api\"\n                    ],\n                    \"packageName\": \"rebar3\",\n                    \"packageURL\": \"pkg:otp/rebar3?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Frebar3&vcs_url=repository_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Frebar3.git\",\n                    \"product\": \"rebar3\",\n                    \"programFiles\": [\n                        \"apps/rebar/src/vendored/r3_hex_repo.erl\",\n                        \"apps/rebar/src/vendored/r3_hex_api.erl\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"r3_hex_repo:get_names/1\"\n                        },\n                        {\n                            \"name\": \"r3_hex_repo:get_versions/1\"\n                        },\n                        {\n                            \"name\": \"r3_hex_repo:get_package/2\"\n                        },\n                        {\n                            \"name\": \"r3_hex_api:request/4\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/erlang/rebar3\",\n                    \"vendor\": \"erlang\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"3.27.3\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.9.1\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"https://github.com","name":"erlang/rebar3","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://github.com\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:erlang:rebar3:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"r3_hex_repo\",\n                        \"r3_hex_api\"\n                    ],\n                    \"packageName\": \"erlang/rebar3\",\n                    \"packageURL\": \"pkg:github/erlang/rebar3\",\n                    \"product\": \"rebar3\",\n                    \"programFiles\": [\n                        \"apps/rebar/src/vendored/r3_hex_repo.erl\",\n                        \"apps/rebar/src/vendored/r3_hex_api.erl\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"r3_hex_repo:get_names/1\"\n                        },\n                        {\n                            \"name\": \"r3_hex_repo:get_versions/1\"\n                        },\n                        {\n                            \"name\": \"r3_hex_repo:get_package/2\"\n                        },\n                        {\n                            \"name\": \"r3_hex_api:request/4\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/erlang/rebar3\",\n                    \"vendor\": \"erlang\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"360838a22f5b3a88c0358207f2923059bcbb3afb\",\n                            \"status\": \"affected\",\n                            \"version\": \"209c02ec57c2cc3207ee0174c3af3675b8dc8f79\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"https://repo.hex.pm","name":"hex_core","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://repo.hex.pm\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:hexpm:hex_core:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"hex_repo\",\n                        \"hex_api\",\n                        \"hex_safe_binary_to_term\"\n                    ],\n                    \"packageName\": \"hex_core\",\n                    \"packageURL\": \"pkg:hex/hex_core\",\n                    \"product\": \"hex_core\",\n                    \"programFiles\": [\n                        \"src/hex_repo.erl\",\n                        \"src/hex_api.erl\",\n                        \"src/hex_safe_binary_to_term.erl\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"hex_repo:get_names/1\"\n                        },\n                        {\n                            \"name\": \"hex_repo:get_versions/1\"\n                        },\n                        {\n                            \"name\": \"hex_repo:get_package/2\"\n                        },\n                        {\n                            \"name\": \"hex_repo:get_policy/2\"\n                        },\n                        {\n                            \"name\": \"hex_api:request/4\"\n                        },\n                        {\n                            \"name\": \"hex_safe_binary_to_term:safe_binary_to_term/1\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/hexpm/hex_core\",\n                    \"vendor\": \"hexpm\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"0.20.0\",\n                            \"status\": \"affected\",\n                            \"version\": \"0.1.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"https://github.com","name":"hexpm/hex_core","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://github.com\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:hexpm:hex_core:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"hex_repo\",\n                        \"hex_api\",\n                        \"hex_safe_binary_to_term\"\n                    ],\n                    \"packageName\": \"hexpm/hex_core\",\n                    \"packageURL\": \"pkg:github/hexpm/hex_core\",\n                    \"product\": \"hex_core\",\n                    \"programFiles\": [\n                        \"src/hex_repo.erl\",\n                        \"src/hex_api.erl\",\n                        \"src/hex_safe_binary_to_term.erl\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"hex_repo:get_names/1\"\n                        },\n                        {\n                            \"name\": \"hex_repo:get_versions/1\"\n                        },\n                        {\n                            \"name\": \"hex_repo:get_package/2\"\n                        },\n                        {\n                            \"name\": \"hex_repo:get_policy/2\"\n                        },\n                        {\n                            \"name\": \"hex_api:request/4\"\n                        },\n                        {\n                            \"name\": \"hex_safe_binary_to_term:safe_binary_to_term/1\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/hexpm/hex_core\",\n                    \"vendor\": \"hexpm\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"ebe25d110717f6a3addba5232cd4a7dc1c76b628\",\n                            \"status\": \"affected\",\n                            \"version\": \"fbb6d9de472e5edb8d6fb6b32a91cb266137892e\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"hex","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"cpes\": [\n                        \"cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"mix_hex_repo\",\n                        \"mix_hex_api\"\n                    ],\n                    \"packageName\": \"hex\",\n                    \"packageURL\": \"pkg:otp/hex?repository_url=https:%2F%2Fgithub.com%2Fhexpm%2Fhex&vcs_url=repository_url=git%2Bhttps:%2F%2Fgithub.com%2Fhexpm%2Fhex.git\",\n                    \"product\": \"hex\",\n                    \"programFiles\": [\n                        \"src/mix_hex_repo.erl\",\n                        \"src/mix_hex_api.erl\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"mix_hex_repo:get_names/1\"\n                        },\n                        {\n                            \"name\": \"mix_hex_repo:get_versions/1\"\n                        },\n                        {\n                            \"name\": \"mix_hex_repo:get_package/2\"\n                        },\n                        {\n                            \"name\": \"mix_hex_repo:get_policy/2\"\n                        },\n                        {\n                            \"name\": \"mix_hex_api:request/4\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/hexpm/hex\",\n                    \"vendor\": \"hexpm\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"2.5.2\",\n                            \"status\": \"affected\",\n                            \"version\": \"2.1.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"https://github.com","name":"hexpm/hex","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://github.com\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"mix_hex_repo\",\n                        \"mix_hex_api\"\n                    ],\n                    \"packageName\": \"hexpm/hex\",\n                    \"packageURL\": \"pkg:github/hexpm/hex\",\n                    \"product\": \"hex\",\n                    \"programFiles\": [\n                        \"src/mix_hex_repo.erl\",\n                        \"src/mix_hex_api.erl\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"mix_hex_repo:get_names/1\"\n                        },\n                        {\n                            \"name\": \"mix_hex_repo:get_versions/1\"\n                        },\n                        {\n                            \"name\": \"mix_hex_repo:get_package/2\"\n                        },\n                        {\n                            \"name\": \"mix_hex_repo:get_policy/2\"\n                        },\n                        {\n                            \"name\": \"mix_hex_api:request/4\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/hexpm/hex\",\n                    \"vendor\": \"hexpm\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"d8b60eee97abb119d525306f048969a217d793a5\",\n                            \"status\": \"affected\",\n                            \"version\": \"671f695ac548ed01f5828c2a739ecaa942b21007\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","score":2.1,"severity":"LOW"}],"references":["https://github.com/hexpm/hex_core/security/advisories/GHSA-7c4r-cgf9-9jmq","https://cna.erlef.org/cves/CVE-2026-105274.html","https://osv.dev/vulnerability/EEF-CVE-2026-105274","https://github.com/erlang/rebar3/commit/209c02ec57c2cc3207ee0174c3af3675b8dc8f79","https://github.com/erlang/rebar3/commit/360838a22f5b3a88c0358207f2923059bcbb3afb","https://github.com/hexpm/hex_core/commit/fbb6d9de472e5edb8d6fb6b32a91cb266137892e","https://github.com/hexpm/hex_core/commit/ebe25d110717f6a3addba5232cd4a7dc1c76b628","https://github.com/hexpm/hex/commit/671f695ac548ed01f5828c2a739ecaa942b21007","https://github.com/hexpm/hex/commit/d8b60eee97abb119d525306f048969a217d793a5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-105274","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-105274","identifiers":["CVE-2026-105274"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-09T15:04:17.9226009+00:00","complete":true,"records":1769,"lastAttemptAt":"2026-11-09T15:04:17.9226009+00:00","lastSuccessAt":"2026-11-09T15:04:18.1621362+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:04:18.1621395+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-24e6fde7b744113daefb8f6135035fb8a5c69c9617c9c0d40574a0376532ffd3-49ad16fb0d34ddf0ae41aa46fedfe58e1df7005677e5f3c7ea3ce3ccbb1e0589","complete":true,"records":421457,"lastAttemptAt":"2026-11-09T15:02:15.2169676+00:00","lastSuccessAt":"2026-11-09T15:02:15.1121329+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:02:15.2169676+00:00","snapshotPublishedAt":"2026-11-09T14:25:18+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-45c23973f1c040bfabdc3f7d346a18c1","complete":false,"records":13655,"lastAttemptAt":"2026-11-09T15:14:18.05021+00:00","lastSuccessAt":"2026-11-09T15:14:18.1153181+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:14:18.1153181+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-09T15:04:17.9226009+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T15:04:17.9226009+00:00","lastSuccessAt":"2026-11-09T15:04:18.1628494+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:04:18.1628497+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-122e73413fbf41e4b6ede4e4f5660885","complete":true,"records":13667,"lastAttemptAt":"2026-11-09T15:04:19.7498555+00:00","lastSuccessAt":"2026-11-09T15:04:19.744+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:04:19.744+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13707,"expectedIdentifiers":13707,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-980593e6977a6d1b4fb1eed5a1ffe88a468736f89f0a06f710924ad59132c023","complete":true,"records":9914,"lastAttemptAt":"2026-11-09T15:04:17.5233893+00:00","lastSuccessAt":"2026-11-08T11:07:07.068788+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:04:17.5233893+00:00","snapshotPublishedAt":"2026-11-08T11:02:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-fde804134ecdda0ddd5ff5c26ee1fff5a6fa659311f7ef2e51c6ad54964db0e2","complete":true,"records":1971,"lastAttemptAt":"2026-11-09T15:02:16.0914115+00:00","lastSuccessAt":"2026-11-06T19:03:17.0399903+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:02:16.0914115+00:00","snapshotPublishedAt":"2026-11-06T18:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-c905fa1bd26c7b261e77cc7202a86dc766ff31c2b096b501f3bf44f561e34970","complete":true,"records":3063,"lastAttemptAt":"2026-11-09T15:04:17.8913143+00:00","lastSuccessAt":"2026-11-09T12:02:21.7931207+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:04:17.8913143+00:00","snapshotPublishedAt":"2026-11-09T11:18:00+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-c5775280c9de3927e2aad763cbfbebcc2ac79b903f8410c65ab9bc1096f5fa3d","complete":true,"records":231299,"lastAttemptAt":"2026-11-09T15:04:17.3926133+00:00","lastSuccessAt":"2026-11-09T15:04:15.9950254+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:04:17.3926133+00:00","snapshotPublishedAt":"2026-11-09T14:33:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}