Improper Verification of Cryptographic Signature Affecting python313-jwcrypto package, versions <1.5.6-160000.4.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.13% (3rd percentile)

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  • Snyk IDSNYK-SLES1600-PYTHON313JWCRYPTO-20256851
  • published29 Sept 2026
  • disclosed10 Sept 2026

Introduced: 10 Sep 2026

NewCVE-2026-84185  (opens in a new tab)
CWE-347  (opens in a new tab)

How to fix?

Upgrade SLES:16.0.0 python313-jwcrypto to version 1.5.6-160000.4.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python313-jwcrypto package and not the python313-jwcrypto package as distributed by SLES. See How to fix? for SLES:16.0.0 relevant fixed versions and status.

A flaw was found in the jwcrypto library, which is used for implementing Javascript Object Signing and Encryption (JOSE) standards. The issue occurs when the library verifies a General JSON Serialization JWS using a set of keys. Due to a coding error, the library fails to correctly identify the specific key ID (kid) and may instead accept a signature made by any valid key in the set. This can allow an attacker with a valid key to bypass authorization checks in applications that rely on the key ID to identify specific tenants or users.

CVSS Base Scores

version 3.1