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CVE-2025-30144 affects the fast-jwt library prior to version 5.0.6. The library does not correctly validate the JWT iss (issuer) claim in accordance with RFC 7519, and improperly accepts an array of strings as a valid iss value. This allows an attacker to craft a token whose iss claim contains both an attacker-controlled issuer and a legitimate issuer, such as ['https://attacker-domain/', 'https://valid-iss'], and have the token pass issuer validation. In deployments where the application or related components such as JWKS retrieval/validation helpers rely on fast-jwt's issuer validation and do not independently enforce strict iss semantics, this flaw can enable acceptance of forged JWTs signed or sourced under attacker control.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Cross-references every affected SKU, including bundled OEM variants.
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