7.4

CVE-2026-102271: jpadilla pyjwt

CVSS: 7.4v3.1HighAnalyzed
AliasesGHSA-p4g4-x82p-q773PYSEC-2026-4149UBUNTU-CVE-2026-102271
Published 28-09-2026Last modified 01-10-2026
Open JSON

Vulnerability summary

CVE-2026-102271 is a high (CVSS 7.4) vulnerability in jpadilla pyjwt. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.1% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.18%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 5 · Related 3
OPENSUSE-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. 01-10-2026
    Last modifiedVulnerability information updated.

Description

PyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes 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

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

29-09-202619-10-2026
EPSS score
0.18%

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-2All versions (No fix recorded) | < 2.11.2-r10
  • authentik-2026.5< 2026.5.7-r4
  • authentik-fips-2026.5< 2026.5.7-r7
  • azureml-inference-server-http< 1.5.1-r10
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-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_project1 product
PyPI1 product
  • pyjwt≥ 2.4.0, < 2.14.0
Ubuntu1 product
  • pyjwtAll versions (No fix recorded)

7 vendors · 96 products

References

11 links
Show all 11 references