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    2 vulnerabilities by benmcollins

    CVE-2026-44699 (GCVE-0-2026-44699)

    Vulnerability from cvelistv5 – Published: 2026-05-15 16:08 – Updated: 2026-05-15 18:04
    VLAI
    Title
    LibJWT: Algorithm confusion allows JWT forgery with RSA JWK as empty-key HMAC
    Summary
    LibJWT is a C JSON Web Token Library. From 3.0.0 to 3.3.2, libjwt accepts an RSA JWK that does not contain an alg parameter as the verification key for an HS256/HS384/HS512 token. In the OpenSSL backend, this causes HMAC verification to run with a zero-length key, so an attacker can forge a valid JWT without knowing any secret or RSA private key. This is an algorithm-confusion authentication bypass. It affects applications that load RSA keys from JWKS where alg is omitted, which is valid JWK syntax and common in real deployments, and then choose the verification algorithm from the JWT header, for example in a kid lookup callback. This vulnerability is fixed in 3.3.3.
    Severity
    9.1 (Critical)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
    • CWE-347 - Improper Verification of Cryptographic Signature
    Assigner
    References
    Impacted products
    Vendor Product Version
    benmcollins libjwt Affected: >= 3.0.0, < 3.3.3
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-33996 (GCVE-0-2026-33996)

    Vulnerability from cvelistv5 – Published: 2026-03-27 22:21 – Updated: 2026-03-31 18:53
    VLAI
    Title
    LibJWT has NULL/bounds validation in JWK octet and RSA PSS parsing
    Summary
    LibJWT is a C JSON Web Token Library. Starting in version 3.0.0 and prior to version 3.3.0, the JWK parsing for RSA-PSS did not protect against a NULL value when expecting to parse JSON string values. A specially crafted JWK file could exploit this behavior by using integers in places where the code expected a string. This was fixed in v3.3.0. A workaround is available. Users importing keys through a JWK file should not do so from untrusted sources. Use the `jwk2key` tool to check for validity of a JWK file. Likewise, if possible, do not use JWK files with RSA-PSS keys.
    Severity
    5.8 (Medium)
    CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:A/VC:L/VI:L/VA:H/SC:L/SI:L/SA:L
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-476 - NULL Pointer Dereference
    Assigner
    References
    Impacted products
    Vendor Product Version
    benmcollins libjwt Affected: >= 3.0.0, < 3.3.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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