CVEvulnerability

CVE-2026-119284

6.9 MEDIUM EPSS 0.19% Published 2026-10-29 Modified 2026-10-30 Official page ↗

Exploitation and prioritisation

EPSS
0.19% chance of exploitation in the next 30 days · in the top 91.1% of all CVEs (2026-11-03)
CISA SSVC: exploitation
poc
CISA SSVC: automatable
yes
CISA SSVC: technical impact
partial
EU Vulnerability Database
EUVD-2026-113401

Affected packages

EcosystemPackageVulnerableFixed inAdvisory
PyPIjoserfc< 1.7.61.7.6GHSA-9pg5-8c7x-5hfx
Status
Deferred
Published
2026-10-29
Last modified
2026-10-30
Assigner
[email protected]
CVSS 4.0 ([email protected])
6.9 MEDIUM — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weaknesses
CWE-400

Description

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.

Related

Weakness · CWE (1)

  • CWE-400 Uncontrolled Resource Consumption weakness

Referenced by GitHub Advisory · alias (1)

  • GHSA-9pg5-8c7x-5hfx joserfc: Compact JWS size guard allocates attacker-controlled segments before rejection advisory · PyPI

References