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CVE-2026-34950

Nearform Fast-jwt vulnerability

9.1 CRITICALPublic exploitEPSS 0.27%
  1. Published6 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Nearform Fast-jwt< 6.2.0

Remediation

Fixed in
Nearform Fast-jwt≥ 6.2.0

References

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Frequently asked

Is CVE-2026-34950 being actively exploited?

CVE-2026-34950 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.27%.

How severe is CVE-2026-34950?

CVE-2026-34950 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.27% probability of exploitation.

Which products are affected by CVE-2026-34950?

Affected products include Nearform Fast-jwt.

How do I fix CVE-2026-34950?

Upgrade affected software to a fixed version, for example Nearform Fast-jwt 6.2.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34950 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.