9.1

CVE-2026-102268: jpadilla pyjwt

CVSS: 9.1v3.1CriticalAnalyzed
AliasesGHSA-ffc3-869f-jxw9PYSEC-2026-4145UBUNTU-CVE-2026-102268
Published 28-09-2026Last modified 29-09-2026
Open JSON

Vulnerability summary

CVE-2026-102268 is a critical (CVSS 9.1) vulnerability in jpadilla pyjwt. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 9.5% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.20%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 6 · Related 4
OPENSUSE-SU-2026:11994-1OPENSUSE-SU-2026:22074-1SUSE-SU-2026:24126-1SUSE-SU-2026:24134-1USN-8916-1USN-8916-2

Timeline

  1. 28-09-2026
    PublishedVulnerability first disclosed.
  2. 29-09-2026
    Last modifiedVulnerability information updated.

Description

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, is_pem_format in jwt/utils.py is affected because is_pem_format does not recognize every PEM representation accepted by the cryptography loader. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a mutated public-key PEM as raw key bytes. As a result, HMACAlgorithm.prepare_key treats the unrecognized asymmetric public key as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

10%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

29-09-202619-10-2026
EPSS score
0.20%

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

Chainguard79 products
  • airflow-2< 2.11.2-r25
  • airflow-core-2< 2.11.2-r10
  • authentik-2026.5< 2026.5.7-r4
  • authentik-fips-2026.5< 2026.5.7-r7
  • azureml-inference-server-httpAll versions (No fix recorded)
Wolfi12 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-integrationsAll versions (No fix recorded)
  • datadog-agent-7.81-core-integrations< 7.81.3-r8
Debian1 product
  • pyjwtAll versions (No fix recorded) | < 2.14.0-1
Jpadilla1 product
Pyjwt_project1 product
PyPI1 product
  • pyjwt< 2.14.0
Ubuntu1 product
  • pyjwtAll versions (No fix recorded)

7 vendors · 96 products

References

11 links
Show all 11 references