{"id":"CVE-2026-103502","revision":null,"records":[{"revision":"eba8f867ac5e40d98a1fed482d6113c6","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-103502","aliases":[],"title":"hex_core's default HTTP adapter doesn't verify TLS certificates on OTP 24 and 25","description":"Improper Certificate Validation vulnerability in hexpm hex_core allows an attacker who can intercept HTTPS connections to impersonate hex.pm, repo.hex.pm or any other repository or API server to programs that use hex_core's default HTTP adapter on Erlang/OTP 24, or on OTP 25 when the operating system's CA certificates can't be loaded.\n\nhex_core:default_config/0 selects the built-in hex_http_httpc adapter. For an HTTPS request whose adapter config has no ssl option, hex_http_httpc:http_options/2 builds options that verify the server certificate against public_key:cacerts_get/0. When that call raises, the adapter prints a warning and sends the request without ssl options, so httpc uses the defaults of the ssl application, which before OTP 26 don't verify the server certificate. public_key:cacerts_get/0 doesn't exist on OTP 24, so every HTTPS request falls back there, and on OTP 25 it raises when no CA store is found. hex_core versions before 0.11.0 never set ssl options, so they don't verify the server certificate on OTP 25 and earlier whether or not a CA store is found.\n\nThe fallback was intended and documented, but the documentation didn't make clear that it meant no certificate verification. Since hex_core 0.8.2 the README has warned that the built-in httpc adapter \"has insecure default settings\" and recommended other HTTP clients, and the adapter prints \"using default ssl options which are insecure\" on every request that falls back. hex_core 0.11.0 added certificate verification with the changelog entry \"Use secure SSL defaults for OTP 25+\". Neither the README nor the warning says that the server certificate isn't verified, the README doesn't say which OTP versions the warning applies to, and on OTP 25 without CA certificates the warning tells users to upgrade to OTP 25 or later, which they already run. This advisory is published so that users who took those notices as general advice know their HTTPS requests weren't authenticated.\n\nThis issue affects hex_core: from 0.1.0 before 0.20.0.","state":0,"publishedAt":"2026-10-12T13:15:29.04+00:00","modifiedAt":"2026-10-16T16:58:36.248+00:00","affected":[{"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_http_httpc\"\n                    ],\n                    \"packageName\": \"hex_core\",\n                    \"packageURL\": \"pkg:hex/hex_core\",\n                    \"product\": \"hex_core\",\n                    \"programFiles\": [\n                        \"src/hex_http_httpc.erl\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"hex_http_httpc:request/5\"\n                        },\n                        {\n                            \"name\": \"hex_http_httpc:request_to_file/6\"\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_http_httpc\"\n                    ],\n                    \"packageName\": \"hexpm/hex_core\",\n                    \"packageURL\": \"pkg:github/hexpm/hex_core\",\n                    \"product\": \"hex_core\",\n                    \"programFiles\": [\n                        \"src/hex_http_httpc.erl\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"hex_http_httpc:request/5\"\n                        },\n                        {\n                            \"name\": \"hex_http_httpc:request_to_file/6\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/hexpm/hex_core\",\n                    \"vendor\": \"hexpm\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"b7b3a42defb4ed8e20a5c68a4412ce68a95b7938\",\n                            \"status\": \"affected\",\n                            \"version\": \"fbb6d9de472e5edb8d6fb6b32a91cb266137892e\",\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:H/VI:L/VA:N/SC:N/SI:N/SA:N","score":5.9,"severity":"MEDIUM"}],"references":["https://github.com/hexpm/hex_core/security/advisories/GHSA-p26c-h8c2-rwqj","https://cna.erlef.org/cves/CVE-2026-103502.html","https://osv.dev/vulnerability/EEF-CVE-2026-103502","https://github.com/hexpm/hex_core/commit/fbb6d9de472e5edb8d6fb6b32a91cb266137892e","https://github.com/hexpm/hex_core/commit/b7b3a42defb4ed8e20a5c68a4412ce68a95b7938"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-103502","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-103502","identifiers":["CVE-2026-103502"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-09T10:04:34.0648037+00:00","complete":true,"records":1769,"lastAttemptAt":"2026-11-09T10:04:34.0648037+00:00","lastSuccessAt":"2026-11-09T10:04:34.2246806+00:00","error":null,"lastVerifiedAt":"2026-11-09T10:04:34.2246841+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-24e6fde7b744113daefb8f6135035fb8a5c69c9617c9c0d40574a0376532ffd3-959e97d06f32ad78d34e1b0ba6a6e5cd74265f5a3f17190fe2a4f93cc705e8ca","complete":true,"records":421341,"lastAttemptAt":"2026-11-09T10:02:25.7011931+00:00","lastSuccessAt":"2026-11-09T10:02:25.6766256+00:00","error":null,"lastVerifiedAt":"2026-11-09T10:02:25.7011931+00:00","snapshotPublishedAt":"2026-11-09T09:30:06+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-994943cd8cb046f49f56409fe0b1d8c6","complete":false,"records":13655,"lastAttemptAt":"2026-11-09T10:16:43.0170247+00:00","lastSuccessAt":"2026-11-09T10:16:43.013+00:00","error":"6 identifier lookups failed; latest failures include HTTP 403. Other identifiers were checked independently.","lastVerifiedAt":"2026-11-09T10:16:43.013+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13701,"expectedIdentifiers":13707,"failedIdentifiers":6},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. 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