Package vulnerability, severity high

joserfc: Unbounded JWE General JSON `recipients` Array Leads to CPU Exhaustion (DoS) via Repeated RSA Private-Key Decryption

Published October 30, 2026, updated October 31, 2026

joserfc: Unbounded JWE General JSON `recipients` Array Leads to CPU Exhaustion (DoS) via Repeated RSA Private-Key Decryption. Source: GHSA-jpxq-7h8p-2q76 (CVE-2026-119283).

What's affected

• joserfc (pypi)<1.7.5

What to do

1. Upgrade joserfc to 1.7.5 or later.

Check whether you were affected

Pharon tells teams automatically when this affects something they run. To check a machine, run this in Claude Code with the Pharon plugin, in the repository that uses it:

/pharon:check-incident ghsa-jpxq-7h8p-2q76

References

• https://osv.dev/vulnerability/GHSA-jpxq-7h8p-2q76
• https://github.com/authlib/joserfc/security/advisories/GHSA-jpxq-7h8p-2q76
• https://nvd.nist.gov/vuln/detail/CVE-2026-119283
• https://github.com/authlib/joserfc/commit/d6dc8df6c7609277e741069d3733e43996c1cd17
• https://github.com/authlib/joserfc
• https://github.com/authlib/joserfc/releases/tag/1.7.5

Notice ghsa-jpxq-7h8p-2q76, signed with key feed-prod-2026-10 (Ed25519). The Pharon CLI verifies the signature before using a notice.