7.5

CVE-2026-32597: PyJWT accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation)

Modified
AliasesSUSE-SU-2026:1199-1SUSE-SU-2026:1389-1SUSE-SU-2026:1400-1
Published 12-03-2026Last modified 10-09-2026

Vulnerability summary

CVE-2026-32597 is a high (CVSS 7.5) vulnerability in jpadilla pyjwt. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 20.4% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (GitHub, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.28%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 12 · Related 3
RHSA-2026:12176RHSA-2026:13508RHSA-2026:13512RHSA-2026:13672RHSA-2026:13916RHSA-2026:17083

Timeline

  1. 12-03-2026
    PublishedVulnerability first disclosed.
  2. 10-09-2026
    Last modifiedVulnerability information updated.

Description

PyJWT is a JSON Web Token implementation in Python. Prior to 2.12.0, PyJWT does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC. This vulnerability is fixed in 2.12.0.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.28% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Pyjwt

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard39 products
  • airflow-2< 2.11.2-r2
  • airflow-3< 3.1.8-r8
  • airflow-core-2< 2.11.2-r1
  • airflow-core-3< 3.1.8-r1
  • authentik< 2026.2.1-r4
Suse19 products
  • python-PyJWT&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS< 2.4.0-150200.3.11.1 | < 2.8.0-150400.8.10.1
  • python-PyJWT&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS< 2.4.0-150200.3.11.1 | < 2.8.0-150400.8.10.1
  • python-PyJWT&distro=SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS< 2.4.0-150200.3.11.1 | < 2.8.0-150400.8.10.1
  • python-PyJWT&distro=SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS< 2.4.0-150200.3.11.1 | < 2.8.0-150400.8.10.1
  • python-PyJWT&distro=SUSE Linux Enterprise Micro 5.5< 2.4.0-150200.3.11.1
Wolfi14 products
  • airflow-3< 3.1.8-r8
  • az< 2.84.0-r3
  • datadog-agent-7.72-core-integrationsAll versions (No fix recorded)
  • datadog-agent-7.73-core-integrations< 7.73.3-r23
  • datadog-agent-7.74-core-integrations< 7.74.1-r24
Opensuse4 products
  • python-PyJWT&distro=openSUSE Leap 15.6< 2.8.0-150400.8.10.1
  • python-PyJWT&distro=openSUSE Leap 16.0< 2.12.1-160000.1.1
  • python-PyJWT&distro=openSUSE Tumbleweed< 2.12.1-1.1
  • python-social-auth-core&distro=openSUSE Tumbleweed< 4.8.7-1.1
Debian1 product
  • pyjwt< 2.6.0-1+deb12u1 | < 2.10.1-2+deb13u1 | < 2.12.1-1
Jpadilla1 product
Pyjwt_project1 product
PyPI1 product
  • pyjwt< 2.12.0
Ubuntu1 product
  • pyjwt< 1.3.0-1ubuntu0.1+esm1 | < 1.5.3+ds1-1ubuntu0.1+esm1 | < 1.7.1-2ubuntu2.1+esm1 | < 2.3.0-1ubuntu0.3 | < 2.7.0-1ubuntu0.1 | < 2.10.1-2ubuntu0.1

9 vendors · 81 products

References

51 links
Show all 51 references