CVSS 4.0
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се локално, без особени условия, без вход и без действие от потребителя.
- Експлоатация: има публичен пример за експлоатация
- Атаката не може да се автоматизира
Описание
Оригинално описание
The jose library accepts ECDSA (ES256, ES256K, ES384, and ES512) JWS signatures of a non-canonical length. When verifying an ECDSA signature, jose_jwk_kty_ec:verify/4 in src/jwk/jose_jwk_kty_ec.erl splits the raw signature in half by its actual byte length (split_binary(Signature, byte_size(Signature) div 2)) instead of enforcing the fixed length required by RFC 7518 §3.4, and then decodes each half with crypto:bytes_to_integer/1, which ignores leading zero bytes. As a result, an attacker who holds one valid token can prepend leading zero bytes to each of the R and S halves to produce longer signatures that still split evenly and decode to the same (r, s) pair, so many distinct signature byte strings all verify against the same key (signature malleability). This does not allow forging new payloads or impersonating a signer, because the underlying (r, s) values are unchanged. It does defeat any security control that assumes a valid token or its signature is unique, such as token-revocation-by-hash, replay or idempotency caches, and deduplication logic. This issue affects jose: from 1.0.0 before 1.11.13.
Засегнати продукти
- potatosalad jose: 1.0.0 преди 1.11.13
- potatosalad jose: a7746ecd4950f85a393136e449a91dac62b5c429 преди 72ce1866622b9329347dc52a94173ac0317bc9cf
Вид слабост
История
- 26 октомври 2026 Публикувано
Други уязвимости в potatosalad jose
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-65632
- https://nvd.nist.gov/vuln/detail/CVE-2026-65632
- https://github.com/potatosalad/erlang-jose/security/advisories/GHSA-44hw-rpw9-mwg4
- https://cna.erlef.org/cves/CVE-2026-65632.html
- https://osv.dev/vulnerability/EEF-CVE-2026-65632
- https://github.com/potatosalad/erlang-jose/commit/a7746ecd4950f85a393136e449a91dac62b5c429
- https://github.com/potatosalad/erlang-jose/commit/72ce1866622b9329347dc52a94173ac0317bc9cf