Quick answers
- Is CVE-2026-119283 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-119283 being exploited in the wild.
- How severe is CVE-2026-119283?
- High severity, with a CVSS score of 7.5, published 29 October 2026.
- Which products and versions are affected?
- Authlib Joserfc before 1.7.5; joserfc (PyPI) < 1.7.5, ECOSYSTEM:introduced=0,fixed=1.7.5.
- Is there a fix for CVE-2026-119283?
- Yes. joserfc (PyPI): upgrade to 1.7.5 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-119283 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-119283?
- Check whether you run Authlib Joserfc or joserfc (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- joserfc (PyPI): upgrade to 1.7.5 or later
pip install "joserfc>=1.7.5"
Technical details
The vulnerability exists in joserfc.jwe.decrypt_json() which processes all entries in a JWE General JSON Serialization recipients array without enforcing a count limit, calling decrypt_cek() for each recipient regardless of the verify_all_recipients setting. An unauthenticated attacker with network access to an endpoint using RSA key-management algorithms can craft requests with arbitrarily large recipient arrays to trigger repeated CPU-intensive private-key decryption operations, resulting in denial of service.
Affected products
- authlib joserfc before 1.7.5
Identifiers
- CVE-2026-119283
- GHSA-jpxq-7h8p-2q76
Timeline
- 2026-10-29: advisory
- 2026-08-29: patched: version 1.7.5 released with max_recipients limit