7.4

CVE-2026-48526: jpadilla pyjwt Improper Authentication

CVSS: 7.4v3.1HighModified
AliasesGHSA-xgmm-8j9v-c9wxPYSEC-2026-179RHSA-2026:25902
Published 28-05-2026Last modified 10-09-2026
Open JSON

Vulnerability summary

CVE-2026-48526 is a high (CVSS 7.4) Improper Authentication vulnerability in jpadilla pyjwt. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 35.5% 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
0.43%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 16 · Related 10
OPENSUSE-SU-2026:11024-1OPENSUSE-SU-2026:21095-1RHSA-2026:34160RHSA-2026:34365RHSA-2026:50222RHSA-2026:50223

Timeline

  1. 28-05-2026
    PublishedVulnerability first disclosed.
  2. 10-09-2026
    Last modifiedVulnerability information updated.

Description

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the secret key for HMAC algorithm. This vulnerability is fixed in 2.13.0.

CVSS metrics

8 scores · 8 sources · 1 version

EPSS trend

Probability

0.43%

Chance of exploitation in the next 30 days

Percentile

36%

Versus all other CVEs

30-day change

+0.03 pp

From 0.40% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.43%

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

Redhat70 products
  • fence-agents< 0:4.16.0-21.el10_2.2 | < 0:4.10.0-110.el9_8.3 | < 0:4.10.0-86.el9_6.18 | < 0:4.10.0-62.el9_4.26 | < 0:4.10.0-43.el9_2.23 | < 0:4.16.0-5.el10_0.11
  • fence-agents-aliyun< 0:4.16.0-21.el10_2.2 | < 0:4.10.0-110.el9_8.3 | < 0:4.10.0-86.el9_6.18 | < 0:4.10.0-62.el9_4.26 | < 0:4.10.0-43.el9_2.23 | < 0:4.16.0-5.el10_0.11
  • fence-agents-all< 0:4.16.0-21.el10_2.2 | < 0:4.10.0-110.el9_8.3 | < 0:4.10.0-86.el9_6.18 | < 0:4.10.0-62.el9_4.26 | < 0:4.10.0-43.el9_2.23 | < 0:4.16.0-5.el10_0.11
  • fence-agents-amt-ws< 0:4.16.0-21.el10_2.2 | < 0:4.10.0-110.el9_8.3 | < 0:4.10.0-86.el9_6.18 | < 0:4.10.0-62.el9_4.26 | < 0:4.10.0-43.el9_2.23 | < 0:4.16.0-5.el10_0.11
  • fence-agents-apc< 0:4.16.0-21.el10_2.2 | < 0:4.10.0-110.el9_8.3 | < 0:4.10.0-86.el9_6.18 | < 0:4.10.0-62.el9_4.26 | < 0:4.10.0-43.el9_2.23 | < 0:4.16.0-5.el10_0.11
Chainguard65 products
  • airflow-2< 2.11.2-r25
  • airflow-core-2< 2.11.2-r10
  • airflow-core-3< 3.2.2-r5
  • airflow-postgres-fips-3< 3.2.2-r3
  • awx< 24.6.1-r41
Wolfi17 products
  • 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
  • datadog-agent-7.75-core-integrationsAll versions (No fix recorded)
  • datadog-agent-7.76< 7.76.3-r41
Debian1 product
  • pyjwtAll versions (No fix recorded) | < 2.13.0-1
Jpadilla1 product
Pyjwt_project1 product
PyPI1 product
  • pyjwt< 2.13.0
Ubuntu1 product
  • pyjwt< 1.3.0-1ubuntu0.1+esm2 | < 1.5.3+ds1-1ubuntu0.1+esm2 | < 1.7.1-2ubuntu2.1+esm2 | < 2.3.0-1ubuntu0.4 | < 2.7.0-1ubuntu0.2 | All versions (No fix recorded) | < 2.10.1-4ubuntu1.1

8 vendors · 157 products

References

53 links
Show all 53 references