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TI-2026-82772 Aliases CVE-2026-119283GHSA-jpxq-7h8p-2q76

Uncontrolled resource consumption in authlib joserfc

Priority HIGH 72CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 8 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

Summary

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.7.5, joserfc.jwe.decrypt_json() accepts a JWE General JSON Serialization recipients array without a count limit and calls decrypt_cek() for every entry. An unauthenticated attacker who can submit a JWE to an endpoint using an RSA key-management algorithm can choose the number of private-key decryption operations performed by one request. The verify_all_recipients option does not reduce this work because the affected loop processes every recipient before consulting that setting, allowing repeated requests to exhaust service CPU without affecting confidentiality or integrity. This issue is fixed in version 1.7.5.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00229 13th percentileScored 2026-11-07
Fix Partial joserfc (authlib): 1.7.5joserfc (PyPI): 1.7.5Red Hat: 8 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
authlibjoserfcbefore 1.7.51.7.5Patch availableCNA
—joserfc (PyPI)before 1.7.51.7.5Patch availableGHSA-jpxq-7h8p-2q76
  • joserfc Vendorauthlib Affected before 1.7.5 Fixed in 1.7.5 Patch available CNA
  • joserfc (PyPI) Vendor— Affected before 1.7.5 Fixed in 1.7.5 Patch available GHSA-jpxq-7h8p-2q76

Remediation

  • Fix · CNA joserfc (authlib) Fixed in 1.7.5
  • Fix · GHSA-jpxq-7h8p-2q76 joserfc (PyPI) Fixed in 1.7.5 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Exploit IntelligenceAffectedNo fix yet
Lightspeed CoreAffectedNo fix yet
Migration Toolkit for Applications 8AffectedNo fix yet
OpenShift LightspeedAffectedNo fix planned: Will not fix
Red Hat Ansible Automation Platform 2AffectedNo fix yet
Red Hat Enterprise Linux command line assistantAffectedNo fix yet
Red Hat OpenShift Virtualization 4AffectedNo fix yet
Red Hat Satellite 6AffectedNo fix yet

Timeline

  1. 2026-10-29 Threatist record created from CVE-2026-119283
  2. 2026-10-30 Affected versions changed · Red Hat
  3. 2026-10-30 CVSS score added · Red Hat
  4. 2026-10-30 Alias added: GHSA-jpxq-7h8p-2q76
  5. 2026-10-30 Fix available: PyPI/[email protected] · GHSA-jpxq-7h8p-2q76
  6. 2026-10-30 CVSS score added · GHSA-jpxq-7h8p-2q76
  7. 2026-10-30 Weakness changed · GHSA-jpxq-7h8p-2q76
  8. 2026-10-30 5 new references · GHSA-jpxq-7h8p-2q76
  9. 2026-10-30 CISA SSVC decision points changed
  10. 2026-10-30 Priority changed: MEDIUM → HIGH
  11. 2026-11-02 Affected versions changed · Red Hat

References

Advisory 1

Other 4

  • TI-2026-65772 Insufficient verification of data authenticity in Authlib CVSS 3.1CRITICAL 9.8
  • TI-2026-74876 Signature verification bypass in joserfc JWS deserialization CVSS 3.1CRITICAL 9.1
  • TI-2026-22305 Authlib JWS JWK Header Injection: Signature Verification Bypass CVSS 3.1CRITICAL 9.1
  • TI-2025-40202 Resource allocation without limits in authlib joserfc CVSS 4.0CRITICAL 9.2
  • TI-2026-36756 joserfc: HS256/HS384/HS512 verify accepts empty/nil HMAC key (cross-language sibling of CVE-2026-45363) CVSS 4.0HIGH 8.7
  • TI-2026-79518 Authlib fix bypass lets attackers forge HS256 tokens with PEM keys CVSS 3.1CRITICAL 9.1
See all 30 →

Sources

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