What’s Vulnerable › Vulnerabilities

CVE-2024-21664: Parsing JSON serialized payload without protected field can lead to segfault

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-01-09 · updated 2026-06-17
• Weakness: CWE-476

Description

jwx is a Go module implementing various JWx (JWA/JWE/JWK/JWS/JWT, otherwise known as JOSE) technologies. Calling `jws.Parse` with a JSON serialized payload where the `signature` field is present while `protected` is absent can lead to a nil pointer dereference. The vulnerability can be used to crash/DOS a system doing JWS verification. This vulnerability has been patched in versions 2.0.19 and 1.2.28.

Affected products

• lestrrat-go jwx: before 2.0.19 — fixed in 2.0.19

How to fix

Upgrade to a fixed version: lestrrat-go jwx 2.0.19. Check the vendor advisory for mitigations.

References

• https://github.com/lestrrat-go/jwx/commit/0e8802ce6842625845d651456493e7c87625601f
• https://github.com/lestrrat-go/jwx/commit/8c53d0ae52d5ab1e2b37c5abb67def9e7958fd65
• https://github.com/lestrrat-go/jwx/commit/d69a721931a5c48b9850a42404f18e143704adcd
• https://github.com/lestrrat-go/jwx/security/advisories/GHSA-pvcr-v8j8-j5q3
• https://github.com/lestrrat-go/jwx/commit/0e8802ce6842625845d651456493e7c87625601f
• https://github.com/lestrrat-go/jwx/commit/8c53d0ae52d5ab1e2b37c5abb67def9e7958fd65
• https://github.com/lestrrat-go/jwx/commit/d69a721931a5c48b9850a42404f18e143704adcd
• https://github.com/lestrrat-go/jwx/security/advisories/GHSA-pvcr-v8j8-j5q3

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