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CVE-2026-107722

9.8 · CRITICAL

fast-jwt provides fast JSON Web Token (JWT) implementation.

Published Oct 8, 2026CWE-347EPSS 0.36%

Overview

CVE-2026-107722 is a critical-severity vulnerability. It was published on October 8, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

fast-jwt provides fast JSON Web Token (JWT) implementation. From 6.2.0 until 6.3.0, fast-jwt can misclassify RSA public-key text as an HMAC secret when the key has non-whitespace content before its PEM header. In src/crypto.js, performDetectPublicKeyAlgorithms trims whitespace but publicKeyPemMatcher remains start-anchored, so comments, control characters, zero-width characters, or wrapper text can prevent PEM detection and reach the HMAC fallback. An attacker who knows the public key bytes can sign arbitrary HS256 claims with that public material when HS256 is inferred or allowed, resulting in authentication or authorization bypass. An asymmetric-only algorithm allowlist prevents the attack. This issue is fixed in version 6.3.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/nearform/fast-jwt/commit/d96bbc6c5336055a6dbfa318fdbab01197264cfaGitHubgithub.com/nearform/fast-jwt/pull/632GitHubgithub.com/nearform/fast-jwt/releases/tag/v6.3.0GitHubgithub.com/nearform/fast-jwt/security/advisories/GHSA-ww5h-9m49-7xx4GitHubgithub.com/nearform/fast-jwt/security/advisories/GHSA-ww5h-9m49-7xx4

How CyberStrike helps

Frequently asked questions

What is CVE-2026-107722?

CVE-2026-107722 is a critical-severity vulnerability. It was published on October 8, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-107722?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-107722?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-107722?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-107722 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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