Is CVE-2026-34950 actively exploited?

No active exploitation of CVE-2026-34950 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34950 be exploited remotely?

Yes. CVE-2026-34950 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34950?

CVE-2026-34950 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2026-34950

CWE-327Published: April 6, 2026· Updated: Apr 7, 2026

9.1

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:5.7th

Official 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.

NVD Source

Technical Analysis

CVE-2026-34950 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.