Dashboard / CVE-2026-35042

CVE-2026-35042

HIGH
MEDIUM Priority: 0.01 BB Relevance: 75/100
Published: 2026-04-06 Modified: 2026-10-24 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: None
I: High
A: None

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.

Weakness Classification (2)

Affected Software (1)

VendorProductVersion
nearform fast-jwt < 6.2.0

References & Advisories (2)

Bug Bounty Relevance

75 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

7.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS — Exploitation Probability

0.15%
Raw Score 0.001550
Percentile 4.6%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00155
2026-10-28
0.00155

Intelligence Sources

nvd ref →

External Links