Use of Password Hash With Insufficient Computational Effort in the jose library allows an attacker who obtains a password-encrypted…
CVE-2026-65629
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 josejwk:toder/2 (JOSE.JWK.toder/2), the josejwkder:tobinary/3 function in src/jwk/josejwkder.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…
Assessment
- CVSS
- 7.4 (v4.0)
- Severity
- High
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 26 October 2026
- Last updated
- 27 October 2026
- Weakness
- CWE-916
- Assigner
- 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
CVSS vectorCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
At the source
References
- https://cna.erlef.org/cves/CVE-2026-65629.html
- https://github.com/potatosalad/erlang-jose/commit/461b261902531ca016190e780bb70862d561a7e0
- https://github.com/potatosalad/erlang-jose/commit/85fddd89ee56b6f9c19eff7d9cfffeef62c330b9
- https://github.com/potatosalad/erlang-jose/security/advisories/GHSA-h4gx-8jq2-mfhc
- https://osv.dev/vulnerability/EEF-CVE-2026-65629
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