Improper Verification of Cryptographic Signature Affecting kserve package, versions <0.21.0-r1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.18% (7th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-KSERVE-20367650
  • published2 Oct 2026
  • disclosed28 Sept 2026

Introduced: 28 Sep 2026

NewCVE-2026-102266  (opens in a new tab)
CWE-347  (opens in a new tab)

How to fix?

Upgrade Chainguard kserve to version 0.21.0-r1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kserve package and not the kserve package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.from_jwk is affected because PyJWK verification path used the decoded key without applying prepare_key validation. This occurs when a trusted JWK Set contains an oct entry with an empty k value. As a result, an attacker signs an HMAC token with the same zero-length key accepted by PyJWT. Consequently, forged token can carry arbitrary authenticated claims. This issue is fixed in version 2.14.0.

CVSS Base Scores

version 3.1