Dashboard / CVE-2026-34950

CVE-2026-34950

CRITICAL
INFO Priority: 0.02 BB Relevance: 78/100
Published: 2026-04-06 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

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

Description

fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.1.0 and earlier, the publicKeyPemMatcher regex in fast-jwt/src/crypto.js uses a ^ anchor that is defeated by any leading whitespace in the key string, re-enabling the exact same JWT algorithm confusion attack that CVE-2023-48223 patched.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
nearform fast-jwt < 6.2.0

References & Advisories (1)

Bug Bounty Relevance

78 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

9.1 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS — Exploitation Probability

0.24%
Raw Score 0.002450
Percentile 15.8%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00245
2026-10-28
0.00245

Intelligence Sources

nvd ref →

External Links