@jsprismarine/client (>=0.12.2-unstable-20250320195345, <=0.13.1), @jsprismarine/prismarine (>=0.12.2-unstable-20250320195345, <=0.13.1) +1 more potentially affected by CVE-2026-35039 via fast-jwt (>=6.0.0, <=6.0.1)

fast-jwt NPM version =6.0.0, =0.12.2-unstable-20250320195345, =0.12.2-unstable-20250320195345, =0.12.2-unstable-20250320195345, =0.13.1 Source cves: CVE-2026-35039 Source advisory: SNYK:JS-FASTJWT-15876720...

@jsprismarine/client (>=0.12.2-unstable-20250320195345, <=0.13.1), @jsprismarine/prismarine (>=0.12.2-unstable-20250320195345, <=0.13.1) +1 more potentially affected by CVE-2023-48223 +1 more via fast-jwt (>=6.0.0, <=6.0.1)

fast-jwt NPM version =6.0.0, =0.12.2-unstable-20250320195345, =0.12.2-unstable-20250320195345, =0.12.2-unstable-20250320195345, =0.13.1 Source cves: CVE-2023-48223, CVE-2026-34950 Source advisory: SNYK:JS-FASTJWT-15876721...

GHSA-MVF2-F6GM-W987 fast-jwt: Incomplete fix for CVE-2023-48223: JWT Algorithm Confusion via Whitespace-Prefixed RSA Public Key

Summary The fix for GHSA-c2ff-88x2-x9pg CVE-2023-48223 is incomplete. 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 the CVE patched. Details The f...

@jsprismarine/client (>=0.12.2-unstable-20250320195345, <=0.13.1), @jsprismarine/prismarine (>=0.12.2-unstable-20250320195345, <=0.13.1) +1 more potentially affected by CVE-2026-34950 via fast-jwt (>=6.0.0, <=6.0.1)

fast-jwt NPM version =6.0.0, =0.12.2-unstable-20250320195345, =0.12.2-unstable-20250320195345, =0.12.2-unstable-20250320195345, =0.13.1 Source cves: CVE-2026-34950 Source advisory: OSV:GHSA-MVF2-F6GM-W987...

fast-jwt: Incomplete fix for CVE-2023-48223: JWT Algorithm Confusion via Whitespace-Prefixed RSA Public Key

Summary The fix for GHSA-c2ff-88x2-x9pg CVE-2023-48223 is incomplete. 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 the CVE patched. Details The f...

EUVD-2023-2944

Malicious code in bioql PyPI...

EUVD-2025-6727

Malicious code in bioql PyPI...

Authentication Bypass

fast-jwt is vulnerable to Authentication Bypass. The vulnerability is due to improper validation of the iss claim, allowing an array of strings as a valid issuer, which can be exploited for JWT forgery and authentication bypass attacks...

CVE-2025-30144

fast-jwt provides fast JSON Web Token JWT implementation. Prior to 5.0.6, the fast-jwt library does not properly validate the iss claim based on the RFC 7519. The iss issuer claim validation within the fast-jwt library permits an array of strings as a valid iss value. This design flaw enables a...

Fast-JWT Improperly Validates iss Claims

Summary The fast-jwt library does not properly validate the iss claim based on the RFC https://datatracker.ietf.org/doc/html/rfc7519page-9. Details The iss issuer claim validation within the fast-jwt library permits an array of strings as a valid iss value. This design flaw enables a potential...

@fibus-digital/sluby (>=0.4.15, <=0.4.32-beta3), @jsprismarine/client (>=0.12.1-unstable-20241211144608, <=0.12.2-unstable-20250317172708) +2 more potentially affected by CVE-2025-30144 via fast-jwt (>=5.0.0, <=5.0.5)

fast-jwt NPM version =5.0.0, =0.4.15, =0.12.1-unstable-20241211144608, =0.12.1-unstable-20241211144608, =0.12.1-unstable-20241211144608, =0.12.2-unstable-20250317172708 Source cves: CVE-2025-30144 Source advisory: OSV:GHSA-GM45-Q3V2-6CF8...

CVE-2025-30144 Fast-JWT Improperly Validates iss Claims

fast-jwt provides fast JSON Web Token JWT implementation. Prior to 5.0.6, the fast-jwt library does not properly validate the iss claim based on the RFC 7519. The iss issuer claim validation within the fast-jwt library permits an array of strings as a valid iss value. This design flaw enables a...

CVE-2025-30144 Fast-JWT Improperly Validates iss Claims

fast-jwt provides fast JSON Web Token JWT implementation. Prior to 5.0.6, the fast-jwt library does not properly validate the iss claim based on the RFC 7519. The iss issuer claim validation within the fast-jwt library permits an array of strings as a valid iss value. This design flaw enables a...

CVE-2025-30144 Fast-JWT Improperly Validates iss Claims

fast-jwt provides fast JSON Web Token JWT implementation. Prior to 5.0.6, the fast-jwt library does not properly validate the iss claim based on the RFC 7519. The iss issuer claim validation within the fast-jwt library permits an array of strings as a valid iss value. This design flaw enables a...

CVE-2025-30144

CVE-2025-30144 affects the fast-jwt library prior to 5.0.6, where iss validation incorrectly accepts an array of strings as a valid issuer. This permissive check can let an attacker forge a JWT containing an issuer array like [host, https://valid-iss], which may be accepted by verifiers (especial...

PT-2025-11698 · Fast-Jwt · Fast-Jwt

Name of the Vulnerable Software and Affected Versions: fast-jwt versions prior to 5.0.6 Description: The fast-jwt library does not properly validate the iss claim based on the RFC 7519, allowing an array of strings as a valid iss value. This enables a potential attack where a malicious actor craf...

fast-jwt 安全漏洞

fast-jwt is a JSON Web Token implementation open-sourced by Nearform. A security vulnerability exists in fast-jwt versions prior to 5.0.6, which stems from improper validation of iss declarations and could lead to a forged JWT...

JSON Web Token (JWT) Algorithm Confusion

fast-jwt is vulnerable to JWT Algorithm Confusion. The vulnerability is caused by a missing validation on publicKeyPemMatcher constant defined in fast-jwt/src/crypto.js which is used to match all common PEM formats for public keys. An attacker can craft a malicious JWT token utilizing the HS256...

@fibus-digital/sluby (>=0.3.0-beta.17, <=0.4.0) potentially affected by CVE-2023-48223 via fast-jwt (3.0.0)

fast-jwt NPM version 3.0.0 is affected by a known vulnerability. The following packages have a transitive dependency on fast-jwt and may be impacted: - @fibus-digital/sluby =0.3.0-beta.17, =0.4.0 Source cves: CVE-2023-48223 Source advisory: OSV:GHSA-C2FF-88X2-X9PG...

GHSA-C2FF-88X2-X9PG JWT Algorithm Confusion

Summary The fast-jwt library does not properly prevent JWT algorithm confusion for all public key types. Details The 'publicKeyPemMatcher' in 'fast-jwt/src/crypto.js' does not properly match all common PEM formats for public keys. To exploit this vulnerability, an attacker needs to craft a...