Improper Verification of Cryptographic Signature Affecting python3-jwt package, versions <0:2.4.0-1.amzn2023.0.4


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

Social Trends
EPSS
0.4% (33rd percentile)

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  • Snyk IDSNYK-AMZN2023-PYTHON3JWT-17415728
  • published23 Jun 2026
  • disclosed28 May 2026

Introduced: 28 May 2026

CVE-2026-48526  (opens in a new tab)
CWE-347  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 python3-jwt to version 0:2.4.0-1.amzn2023.0.4 or higher.
This issue was patched in ALAS2023-2026-1842.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3-jwt package and not the python3-jwt package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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.

References

CVSS Base Scores

version 3.1