CVE-2026-33996
LibJWT has NULL/bounds validation in JWK octet and RSA PSS parsing
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
6th
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.
| CWE | CWE-476 |
| Vendor | benmcollins |
| Product | libjwt |
| Published | Mar 27, 2026 |
| Last Updated | Mar 31, 2026 |
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Affected Versions
benmcollins / libjwt
>= 3.0.0, < 3.3.0