{"id":"CVE-2026-65627","revision":"d8edf7257ef54f30a2539418f31db227","records":[{"revision":"d8edf7257ef54f30a2539418f31db227","observedAt":"2026-10-26T20:35:31.018+00:00","statement":{"source":"cve-program","id":"CVE-2026-65627","aliases":[],"title":"Decompression bomb via unbounded zlib:inflate in jose_jwe_zip:uncompress/2","description":"Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in potatosalad jose (erlang-jose) allows a remote attacker to exhaust a node's memory with a small crafted JWE token.\n\nThe jose_jwe_zip:uncompress/2 function in src/jwe/jose_jwe_zip.erl decompresses the DEFLATE-compressed plaintext of a JWE that carries the optional zip: DEF header by calling zlib:inflate/2 on the entire attacker-controlled stream, with no bound on the output size or the inflation ratio. Raw DEFLATE reaches ratios around 1000:1 on highly repetitive input, so a few-kilobyte token inflates to hundreds of megabytes or gigabytes in a single call.\n\nDecompression runs automatically during decryption through jose_jwe:block_decrypt/2 (JOSE.JWE.block_decrypt/2 in Elixir), before the recipient can inspect or reject the payload. With the common asymmetric key-management algorithms (RSA-OAEP, ECDH-ES) an attacker needs only the recipient's public key to craft such a token, so no authentication or secret material is required. A single small token can exhaust the node's memory and crash the BEAM, denying service to all users.\n\nThis issue affects jose: from 1.0.0 before 1.11.13.","state":0,"publishedAt":"2026-10-26T19:53:16.336+00:00","modifiedAt":"2026-10-26T19:53:16.336+00:00","affected":[{"ecosystem":"https://repo.hex.pm","name":"jose","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://repo.hex.pm\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:potatosalad:jose:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"jose_jwe_zip\",\n                        \"jose_jwe\",\n                        \"'Elixir.JOSE.JWE'\"\n                    ],\n                    \"packageName\": \"jose\",\n                    \"packageURL\": \"pkg:hex/jose\",\n                    \"product\": \"jose\",\n                    \"programFiles\": [\n                        \"src/jwe/jose_jwe_zip.erl\",\n                        \"src/jwe/jose_jwe.erl\",\n                        \"lib/jose/jwe.ex\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"jose_jwe_zip:uncompress/2\"\n                        },\n                        {\n                            \"name\": \"jose_jwe:block_decrypt/2\"\n                        },\n                        {\n                            \"name\": \"'Elixir.JOSE.JWE':block_decrypt/2\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/potatosalad/erlang-jose\",\n                    \"vendor\": \"potatosalad\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"1.11.13\",\n                            \"status\": \"affected\",\n                            \"version\": \"1.0.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"https://github.com","name":"potatosalad/erlang-jose","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://github.com\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:potatosalad:jose:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"jose_jwe_zip\",\n                        \"jose_jwe\",\n                        \"'Elixir.JOSE.JWE'\"\n                    ],\n                    \"packageName\": \"potatosalad/erlang-jose\",\n                    \"packageURL\": \"pkg:github/potatosalad/erlang-jose\",\n                    \"product\": \"jose\",\n                    \"programFiles\": [\n                        \"src/jwe/jose_jwe_zip.erl\",\n                        \"src/jwe/jose_jwe.erl\",\n                        \"lib/jose/jwe.ex\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"jose_jwe_zip:uncompress/2\"\n                        },\n                        {\n                            \"name\": \"jose_jwe:block_decrypt/2\"\n                        },\n                        {\n                            \"name\": \"'Elixir.JOSE.JWE':block_decrypt/2\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/potatosalad/erlang-jose\",\n                    \"vendor\": \"potatosalad\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"857eb8e7f2d33e2c9ca2189e77226561cacaf2ad\",\n                            \"status\": \"affected\",\n                            \"version\": \"a7746ecd4950f85a393136e449a91dac62b5c429\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":6.9,"severity":"MEDIUM"}],"references":["https://github.com/potatosalad/erlang-jose/security/advisories/GHSA-wfpv-qxp8-x5gm","https://cna.erlef.org/cves/CVE-2026-65627.html","https://osv.dev/vulnerability/EEF-CVE-2026-65627","https://github.com/potatosalad/erlang-jose/commit/a7746ecd4950f85a393136e449a91dac62b5c429","https://github.com/potatosalad/erlang-jose/commit/857eb8e7f2d33e2c9ca2189e77226561cacaf2ad"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-65627","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-65627","identifiers":["CVE-2026-65627"]},"retained":false,"historicalAffected":[]}],"coverage":[]}