CVE-2026-102946
criticaljoserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards.
joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.7.4, joserfc.jws.deserialize_json() accepts a JWS General JSON Serialization with an empty signatures array as authenticated. The verify_general_json() loop performs no iterations for the empty array and returns success because no signature check failed, allowing an attacker without a signing key to supply an arbitrary payload that relying applications may treat as authentic. The issue affects the General JSON Serialization path; compact JWS and JWT decoding, Flattened JSON serialization, and JWE JSON processing do not follow this vulnerable path. This issue is fixed in version 1.7.4.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe security-advisories@github.com
- https://github.com/authlib/joserfc/releases/tag/1.7.4 security-advisories@github.com
- https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2 security-advisories@github.com
- https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2 134c704f-9b21-4f2e-91b3-4a467353bcc0