CVEvulnerability

CVE-2026-103001

6.5 MEDIUM Published 2026-09-30 Modified 2026-10-08 Official page ↗
Status
Analyzed
Published
2026-09-30
Last modified
2026-10-08
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Weaknesses
CWE-471

Description

PyJWT is a Python implementation of JSON Web Token standards. From 2.11.0 through 2.13.0, PyJWT's PyJWT._merge_options() method can modify a caller-supplied mutable options mapping when verify_signature is false. If an application reuses that same mapping for a later decode() or decode_complete() call and changes verify_signature to true, the mapping can retain false values for expiration, not-before, issued-at, audience, issuer, subject, and JWT ID checks. A signed token with invalid registered claims can then be accepted without disabling signature verification, but applications that create a fresh options mapping for each call are not affected.

Affected configurations

• pyjwt project pyjwt (>= 2.11.0 < 2.13.0)

Related

Weakness · CWE (1)

  • CWE-471 Modification of Assumed-Immutable Data (MAID) weakness

References