CVE catalog
CVE-2026-33996
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.
- Severity
- Medium · CVSS 5.9
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.16% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libjwt | sid | 1.17.2-1 | not affected |
| Debian | libjwt | forky | 1.17.2-1 | not affected |
| Debian | libjwt | trixie | 1.17.2-1 | not affected |
| Debian | libjwt | bookworm | 1.10.2-1+deb12u1 | not affected |
| Cpe | libjwt | Not reported | 3.3.0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libjwt | source | sid | Not affected | unimportant | Not reported | Not reported |
| Debian | libjwt | source | forky | Not affected | unimportant | Not reported | Not reported |
| Debian | libjwt | source | trixie | Not affected | unimportant | Not reported | Not reported |
| Debian | libjwt | source | bookworm | Not affected | unimportant | Not reported | Not reported |
| Cpe | libjwt | cpe | Not reported | 3.3.0 | Not reported | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libjwt0]Not affected
Source package: [libjwt]
Details (2)
1.10.2-1+deb12u1· amd64 · bookwormNot affected
nvd · libjwt · debian · bookworm
1.10.2-1+deb12u1· arm64 · bookwormNot affected
nvd · libjwt · debian · bookworm
- [libjwt-dev]Not affected
Source package: [libjwt]
Details (2)
1.10.2-1+deb12u1· amd64 · bookwormNot affected
nvd · libjwt · debian · bookworm
1.10.2-1+deb12u1· arm64 · bookwormNot affected
nvd · libjwt · debian · bookworm
- [libjwt-gnutls0]Not affected
Source package: [libjwt]
Details (2)
1.10.2-1+deb12u1· amd64 · bookwormNot affected
nvd · libjwt · debian · bookworm
1.10.2-1+deb12u1· arm64 · bookwormNot affected
nvd · libjwt · debian · bookworm
- [libjwt-gnutls-dev]Not affected
Source package: [libjwt]
Details (2)
1.10.2-1+deb12u1· amd64 · bookwormNot affected
nvd · libjwt · debian · bookworm
1.10.2-1+deb12u1· arm64 · bookwormNot affected
nvd · libjwt · debian · bookworm
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-33996]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-33996]
- [https://security-tracker.debian.org/tracker/CVE-2026-33996]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33996.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]