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CVE-2026-35042

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CVE-2026-35042

Published: Apr 6, 2026

Modified: Apr 7, 2026

PUBLISHED

CVSS v3.1

7.5

HIGH

Description

fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.1.0 and earlier, fast-jwt does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that fast-jwt does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC.

VendorProductVersions

nearform

fast-jwt

affected
<= 6.1.0

Weaknesses (CWE)

CWE-345
CWE-636

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

References

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