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TI-2026-65218 Aliases CVE-2026-101917GHSA-2gx3-rcp4-g85q

PyJWT: PyJWKClient still amplifies unauthenticated JWKS fetches on unknown kid values (incomplete fix of CVE-2026-48524)

Priority HIGH 72CWE-770Published · 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: 2 fixed, 20 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-770.

Summary

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT get_signing_key_from_jwt is affected because unknown kid misses force refreshes without a negative cache or minimum refresh interval. This occurs when unauthenticated tokens repeatedly use the same unknown kid or varying kid values absent from the cached JWKS. As a result, each cache miss causes PyJWKClient to refresh the JWKS. Consequently, attacker traffic can amplify outbound requests to the configured JWKS endpoint. This issue is fixed in version 2.14.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00428 37th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial pyjwt (jpadilla): 2.14.0pyjwt (PyPI): 2.14.0Red Hat: 7 advisoriesRed Hat: 2 fixed, 20 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
jpadillapyjwtbefore 2.14.02.14.0Patch availableCNA
—pyjwt (PyPI)before 2.14.02.14.0Patch availableGHSA-2gx3-rcp4-g85q
  • pyjwt Vendorjpadilla Affected before 2.14.0 Fixed in 2.14.0 Patch available CNA
  • pyjwt (PyPI) Vendor— Affected before 2.14.0 Fixed in 2.14.0 Patch available GHSA-2gx3-rcp4-g85q

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:pyjwt_project:pyjwt:*:*:*:*:*:*:*:*before 2.14.0Vulnerablejpadilla
  • cpe:2.3:a:pyjwt_project:pyjwt:*:*:*:*:*:*:*:* Versions before 2.14.0 Vulnerable ·jpadilla

Remediation

  • Fix · CNA pyjwt (jpadilla) Fixed in 2.14.0
  • Fix · GHSA-2gx3-rcp4-g85q pyjwt (PyPI) Fixed in 2.14.0 Advisory →

Red Hat 7 advisories

  • RHSA-2026:92452 Released 2026-10-29 · Red Hat rating Critical
    Red Hat Enterprise Linux AI 3.5.2 enhancement update
    • Red Hat Enterprise Linux AI 3.5 registry.redhat.io/rhelai3/bootc-aws-cuda-rhel9, registry.redhat.io/rhelai3/bootc-azure-cuda-rhel9, registry.redhat.io/rhelai3/bootc-azure-rocm-rhel9 +3
  • RHSA-2026:92449 Released 2026-10-29 · Red Hat rating Critical
    Red Hat Enterprise Linux AI 3.5.2 enhancement update
    • Red Hat Enterprise Linux AI 3.5 registry.redhat.io/rhelai3/disk-image-cuda-rhel9
  • RHSA-2026:82415 Released 2026-10-13 · Red Hat rating Critical
    Red Hat AI Inference 3.5.2 (cpu)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-cpu-rhel9
Show 4 more Red Hat advisories
  • RHSA-2026:82371 Released 2026-10-13 · Red Hat rating Critical
    Red Hat AI Inference 3.5.2 (spyre)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-spyre-rhel9
  • RHSA-2026:82368 Released 2026-10-13 · Red Hat rating Critical
    Red Hat AI Inference 3.5.2 (cuda)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-cuda-rhel9
  • RHSA-2026:82061 Released 2026-10-13 · Red Hat rating Critical
    Red Hat AI Inference Tech Preview 3.5.2 (Gaudi)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-gaudi-rhel9
  • RHSA-2026:82059 Released 2026-10-13 · Red Hat rating Critical
    Red Hat AI Inference 3.5.2 (ROCm)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-rocm-rhel9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Ansible Automation Orchestrator 2026AffectedNo fix yet: Fix deferred
Confidential Compute AttestationAffectedNo fix yet: Fix deferred
Fence Agents Remediation OperatorAffectedNo fix yet: Fix deferred
Lightspeed CoreAffectedNo fix yet: Fix deferred
Migration Toolkit for Applications 8AffectedNo fix yet: Fix deferred
OpenShift LightspeedAffectedNo fix yet: Fix deferred
Red Hat AI Inference ServerAffectedNo fix yet: Fix deferred
Red Hat Ansible Automation Platform 2AffectedNo fix yet: Fix deferred
Red Hat Ceph Storage 4AffectedNo fix yet: Fix deferred
Red Hat Ceph Storage 7AffectedNo fix yet: Fix deferred
Red Hat Ceph Storage 9AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 5AffectedNo fix yet: Fix deferred
Red Hat OpenShift Virtualization 4AffectedNo fix yet: Fix deferred
Red Hat Quay 3AffectedNo fix yet: Fix deferred
Red Hat Satellite 6AffectedNo fix yet: Fix deferred
Red Hat Trusted Artifact SignerAffectedNo fix yet: Fix deferred
Red Hat Update Infrastructure 5AffectedNo fix yet: Fix deferred
Red Hat AI Inference Server 3.5Fixed RHSA-2026:82059, RHSA-2026:82061, RHSA-2026:82368, RHSA-2026:82371, RHSA-2026:82415
Red Hat Enterprise Linux AI 3.5Fixed RHSA-2026:92449, RHSA-2026:92452
Not affected: 12 products
  • Red Hat AI Inference Server
  • Red Hat Ansible Automation Platform 2
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat Enterprise Linux command line assistant
  • Red Hat Hardened Images
  • Red Hat OpenStack Platform 13 (Queens)
  • Red Hat OpenStack Platform 16.2
  • Red Hat OpenStack Platform 17.1
  • Red Hat OpenStack Platform 18.0
  • Red Hat Satellite 6
  • Red Hat Update Infrastructure 4 for Cloud Providers

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-101917
  2. 2026-10-03 Alias added: GHSA-2gx3-rcp4-g85q
  3. 2026-10-08 CVSS score added · NVD
  4. 2026-10-08 Priority changed: MEDIUM → HIGH
  5. 2026-10-09 Affected versions changed · Red Hat
  6. 2026-10-13 Fix available: RHSA-2026:82061 · Red Hat
  7. 2026-10-13 Fix available: RHSA-2026:82059 · Red Hat
  8. 2026-10-13 Fix available: Red Hat AI Inference Server 3.5 · Red Hat
  9. 2026-10-14 Fix available: RHSA-2026:82368 · Red Hat
  10. 2026-10-14 Fix available: RHSA-2026:82415 · Red Hat
  11. 2026-10-14 Fix available: RHSA-2026:82371 · Red Hat
  12. 2026-10-15 Affected versions changed · Red Hat
  13. 2026-10-30 Fix available: RHSA-2026:92452 · Red Hat
  14. 2026-10-30 Fix available: RHSA-2026:92449 · Red Hat
  15. 2026-10-30 Fix available: Red Hat Enterprise Linux AI 3.5 · Red Hat
  16. 2026-10-30 Affected versions changed · Red Hat

References

Exploit 1

Patch 1

Advisory 1

Other 2

  • TI-2026-65303 Improper signature verification in jpadilla pyjwt CVSS 3.1CRITICAL 9.1
  • TI-2026-65301 PyJWK accepts empty HMAC keys, bypassing PyJWT's empty-key validation CVSS 3.1CRITICAL 9.1
  • TI-2026-65219 PyJWT: Unauthenticated RecursionError DoS in pre-verification payload parse… CVSS 3.1HIGH 7.5
  • TI-2026-25107 PyJWT accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation) CVSS 3.1HIGH 7.5
  • TI-2026-65310 PyJWT accepts inconsistent OKP x/d JWKs, causing public/private key identity confusion CVSS 3.1HIGH 8.2
  • TI-2026-65307 PyJWT BOM Bypass CVSS 3.1HIGH 7.4
See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences