CVE-2026-33996
Last modified
CVE-2026-33996 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.15% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Libjwt | Libjwt | >= 3.0.0, < 3.3.0 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-33996?
How severe is CVE-2026-33996?
How do I fix CVE-2026-33996?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-33990Docker Model Runner (DMR) is software used to manage, run, a…9.1
- CVE-2026-33991WeGIA is a web manager for charitable institutions. Prior to…8.8
- CVE-2026-33992pyLoad is a free and open-source download manager written in…6.5
- CVE-2026-33993Locutus brings stdlibs of other programming languages to Jav…9.8
- CVE-2026-33994Locutus brings stdlibs of other programming languages to Jav…9.8
- CVE-2026-33995FreeRDP is a free implementation of the Remote Desktop Proto…5.3
- CVE-2026-33997Moby is an open source container framework. Prior to version…8.1
- CVE-2026-33999A flaw was found in the X.Org X server. This integer underfl…7.8
- CVE-2026-3400A security flaw has been discovered in Tenda AC15 up to 15.1…9.8
- CVE-2026-34000A flaw was found in the X.Org X server. This out-of-bounds r…9.1
- CVE-2026-34001A flaw was found in the X.Org X server. This use-after-free …7.8
- CVE-2026-34002A flaw was found in the X.Org X server. This vulnerability, …9.1
Are you affected by CVE-2026-33996?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST