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    CVE-2026-34950

    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.

    Published:Apr 6, 2026
    Last Modified:Apr 22, 2026
    EPS:Apr 6, 2026
    EPSS Score:0.00017
    CVSS Score:9.1

    Affected Products

    Vendor
    Nearform
    Product
    Fast-jwt

    Exploits

    https://github.com/nearform/fast-jwt/security/advisories/GHSA-mvf2-f6gm-w987

    Related CVEs

    CVE-2026-44351 (CVSS 9.1) — fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to 6.2.4, a critical authentication-bypass v…
    CVE-2026-35041 (CVSS 4.2) — fast-jwt provides fast JSON Web Token (JWT) implementation. From 5.0.0 to 6.2.0, a denial-of-service condition…
    CVE-2026-35040 (CVSS 5.3) — fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to 6.2.1, using certain modifiers on RegExp …
    CVE-2026-35042 (CVSS 7.5) — fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.1.0 and earlier, fast-jwt does not validate t…
    CVE-2026-35039 (CVSS 9.1) — fast-jwt provides fast JSON Web Token (JWT) implementation. From 0.0.1 to before 6.2.0, setting up a custom ca…
    CVE-2025-30144 (CVSS 6.5) — fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to 5.0.6, the fast-jwt library does not prop…
    CVE-2023-48223 (CVSS 5.9) — fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to version 3.3.2, the fast-jwt library does …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High