---
id: CVE-2026-102265
title: PyJWT is a Python implementation of JSON Web Token standards
summary: >-
  PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0
  until 2.14.0, PyJWS._load in jwt/api_jws.py is affected because parser catches
  ValueError but not RecursionError. This occurs when a deeply nested token
  header rea…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-674
  - CWE-248
vendor: pyjwt_project
product: pyjwt
affected:
  - pyjwt = 2.13.0
patched:
  - pyJWT 2.14.0
published: '2026-09-28'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T20:57:14.290'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102265'
references:
  - url: >-
      https://github.com/jpadilla/pyjwt/commit/06573692ebcdec8831c3927513b3e87c31fbbb62
    label: security-advisories@github.com
  - url: 'https://github.com/jpadilla/pyjwt/releases/tag/2.14.0'
    label: security-advisories@github.com
  - url: 'https://github.com/jpadilla/pyjwt/security/advisories/GHSA-8wjv-2p76-3863'
    label: security-advisories@github.com
  - url: 'https://github.com/jpadilla/pyjwt/security/advisories/GHSA-8wjv-2p76-3863'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102265.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-102265'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2542703'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-102265'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102265'
  - url: 'https://github.com/advisories/GHSA-8wjv-2p76-3863'
  - url: 'https://github.com/jpadilla/pyjwt'
  - url: 'https://pypi.org/project/pyjwt'
  - url: 'https://access.redhat.com/errata/RHSA-2026:82415'
  - url: 'https://access.redhat.com/errata/RHSA-2026:82368'
  - url: 'https://access.redhat.com/errata/RHSA-2026:82061'
  - url: 'https://access.redhat.com/errata/RHSA-2026:82059'
  - url: 'https://access.redhat.com/errata/RHSA-2026:82371'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
  - ghsa
  - pip
  - osv
epss: 0.00343
epssPercentile: 0.27656
aliases:
  - GHSA-8wjv-2p76-3863
  - PYSEC-2026-4142
ecosystem: pip
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-01T15:00:55.850520Z'
ingestedAt: '2026-09-28T21:20:54.779Z'
---

## Overview

PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, PyJWS._load in jwt/api_jws.py is affected because parser catches ValueError but not RecursionError. This occurs when a deeply nested token header reaches json.loads. As a result, RecursionError escapes the documented PyJWT error hierarchy. Consequently, an unauthenticated malformed token can cause a request-level failure and HTTP 500. This issue is fixed in version 2.14.0.

## Affected

- `pyjwt = 2.13.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-102265)

Affected packages:

- `pyJWT >= 2.13.0, < 2.14.0`

Patched in:

- `pyJWT 2.14.0`

Source: https://github.com/advisories/GHSA-8wjv-2p76-3863

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Ansible Automation Orchestrator 2026, Confidential Compute Attestation, Fence Agents Remediation Operator, Lightspeed Core, Migration Toolkit for Applications 8, OpenShift Lightspeed, … · no fix planned: Ansible Automation Orchestrator 2026, Confidential Compute Attestation, Fence Agents Remediation Operator, Lightspeed Core, … · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102265.json)
- **RHSA-2026:82415** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82415)
- **RHSA-2026:82368** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82368)
- **RHSA-2026:82061** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82061)
- **RHSA-2026:82059** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82059)
- **RHSA-2026:82371** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82371)