{"id":"UBUNTU-CVE-2026-65629","details":"Use of Password Hash With Insufficient Computational Effort in the jose library allows an attacker who obtains a password-encrypted private-key export to recover the private key through an offline password-cracking attack. When jose exports a password-encrypted private key with jose_jwk:to_der/2 (JOSE.JWK.to_der/2), the jose_jwk_der:to_binary/3 function in src/jwk/jose_jwk_der.erl serializes the key as a PKCS#8 EncryptedPrivateKeyInfo using the PBES2 scheme with hardcoded key-derivation parameters: PBKDF2-HMAC-SHA256 with an iteration count of 2048 and an 8-byte (64-bit) random salt. Neither value can be overridden by the caller. Both values are far below current guidance (OWASP recommends on the order of 600,000 iterations for PBKDF2-HMAC-SHA256, and NIST recommends salts of at least 128 bits), so the key-stretching work factor is roughly 300 times lower than intended and the short salt reduces the cost of precomputation across keys. The symmetric encryption (AES-256-CBC with a 16-byte random IV) is not affected; the weakness is entirely in the derivation strength. An attacker who obtains one of these exported blobs (for example from a backup, configuration repository, object storage, or logs) can mount a cheap offline dictionary or brute-force attack against the export password, and success yields the full private key. This issue affects jose: from 1.10.0 before 1.11.13.","modified":"2026-10-28T20:17:35.180334065Z","published":"2026-10-26T20:17:00Z","upstream":["CVE-2026-65629"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-65629"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-65629"},{"type":"REPORT","url":"https://cna.erlef.org/cves/cve-2026-65629.html"},{"type":"REPORT","url":"https://github.com"},{"type":"REPORT","url":"https://github.com/potatosalad/erlang-jose"},{"type":"REPORT","url":"https://github.com/potatosalad/erlang-jose/commit/461b261902531ca016190e780bb70862d561a7e0"},{"type":"REPORT","url":"https://github.com/potatosalad/erlang-jose/commit/85fddd89ee56b6f9c19eff7d9cfffeef62c330b9"},{"type":"REPORT","url":"https://github.com/potatosalad/erlang-jose/security/advisories/ghsa-h4gx-8jq2-mfhc"},{"type":"REPORT","url":"https://hex.pm/packages/jose"},{"type":"REPORT","url":"https://repo.hex.pm"},{"type":"REPORT","url":"https://github.com/cveproject/cvelistv5/tree/main/cves/2026/65xxx/cve-2026-65629.json"},{"type":"REPORT","url":"https://nvd.nist.gov/vuln/detail/cve-2026-65629"},{"type":"REPORT","url":"https://osv.dev/vulnerability/eef-cve-2026-65629"}],"affected":[{"package":{"name":"jose","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/jose?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["10-2","10-2build1"],"ecosystem_specific":{"binaries":[{"binary_version":"10-2build1","binary_name":"jose"},{"binary_name":"libjose0","binary_version":"10-2build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65629.json"}},{"package":{"name":"jose","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/jose?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["10-2build2"],"ecosystem_specific":{"binaries":[{"binary_name":"jose","binary_version":"10-2build2"},{"binary_version":"10-2build2","binary_name":"libjose0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65629.json"}},{"package":{"name":"jose","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/jose?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["10-3","11-2"],"ecosystem_specific":{"binaries":[{"binary_name":"jose","binary_version":"11-2"},{"binary_name":"libjose0","binary_version":"11-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65629.json"}},{"package":{"name":"jose","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/jose?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11-2","11-3","11-3build1","11-3build2","13-1"],"ecosystem_specific":{"binaries":[{"binary_version":"13-1","binary_name":"jose"},{"binary_name":"libjose0","binary_version":"13-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65629.json"}},{"package":{"name":"jose","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/jose?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["14-2build1","14-2build2"],"ecosystem_specific":{"binaries":[{"binary_name":"jose","binary_version":"14-2build2"},{"binary_version":"14-2build2","binary_name":"libjose0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65629.json"}},{"package":{"name":"jose","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/jose?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["14-2build1"],"ecosystem_specific":{"binaries":[{"binary_version":"14-2build1","binary_name":"jose"},{"binary_version":"14-2build1","binary_name":"libjose0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65629.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}