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NVD Vulnerability Details :
CVE-2026-34950
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-06 Apr, 2026 | 16:16
Updated At-22 Apr, 2026 | 20:17

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.19.1CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Type: Secondary
Version: 3.1
Base score: 9.1
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CPE Matches
nearform
nearform
>>fast-jwt>>Versions before 6.2.0(exclusive)
cpe:2.3:a:nearform:fast-jwt:*:*:*:*:*:node.js:*:*
Weaknesses
CWE IDTypeSource
CWE-327Primarysecurity-advisories@github.com
CWE ID: CWE-327
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/nearform/fast-jwt/security/advisories/GHSA-mvf2-f6gm-w987security-advisories@github.com
Exploit
Vendor Advisory
Hyperlink: https://github.com/nearform/fast-jwt/security/advisories/GHSA-mvf2-f6gm-w987
Source: security-advisories@github.com
Resource:
Exploit
Vendor Advisory
Change History
0Changes found
Details not found