Resource Exhaustion Affecting joserfc package, versions <1.7.7-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-JOSERFC-21885070
- published30 Oct 2026
- disclosed29 Oct 2026
Introduced: 29 Oct 2026
NewCVE-2026-119284 (opens in a new tab)How to fix?
Upgrade Debian:unstable joserfc to version 1.7.7-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream joserfc package and not the joserfc package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.7.6, joserfc compact JWS deserialization calls bytes.split() before enforcing the existing aggregate segment-size limits. When attacker-controlled compact serialization bytes reach deserialize_compact(), the split creates copies of the header, payload, and signature segments before ExceededSizeError rejects them, causing an additional allocation approximately proportional to the supplied token. Requests that exhaust available process memory can therefore cause an availability failure even though signature verification fails. This issue is fixed in version 1.7.6.