5.3

CVE-2026-102265: jpadilla pyjwt Uncontrolled Recursion

CVSS: 5.3v3.1MediumAnalyzed
AliasesGHSA-8wjv-2p76-3863PYSEC-2026-4142UBUNTU-CVE-2026-102265
Published 28-09-2026Last modified 01-10-2026
Open JSON

Vulnerability summary

CVE-2026-102265 is a medium (CVSS 5.3) Uncontrolled Recursion vulnerability in jpadilla pyjwt. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 21.4% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.30%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Timeline

  1. 28-09-2026
    PublishedVulnerability first disclosed.
  2. 01-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.30%

Chance of exploitation in the next 30 days

Percentile

21%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

29-09-202619-10-2026
EPSS score
0.30%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Pyjwt

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Chainguard76 products
  • authentik-2026.5< 2026.5.7-r4
  • authentik-fips-2026.5< 2026.5.7-r7
  • azureml-inference-server-httpAll versions (No fix recorded)
  • azureml-inference-server-http-fips< 1.5.1-r9
  • datadog-agent-7.77-core-integrations< 7.77.3-r26
Wolfi11 products
  • datadog-agent-7.77-core-integrations< 7.77.3-r26
  • datadog-agent-7.78-core-integrationsAll versions (No fix recorded)
  • datadog-agent-7.79-core-integrations< 7.79.2-r20
  • datadog-agent-7.80-core-integrations< 7.80.4-r19
  • datadog-agent-7.81-core-integrations< 7.81.3-r8
Debian1 product
  • pyjwtAll versions (No fix recorded) | < 2.14.0-1
Jpadilla1 product
  • pyjwt≥ 2.13.0, < 2.14.0
Pyjwt_project1 product
PyPI1 product
  • pyjwt≥ 2.13.0, < 2.14.0
Ubuntu1 product
  • pyjwtAll versions (No fix recorded)

7 vendors · 92 products

References

11 links
Show all 11 references