CVE-2024-21664: jwx is a Go module implementing various JWx (JWA/JWE/JWK/JWS/JWT, otherwise known as JOSE) technologies

Q: How do I fix CVE-2024-21664?

jwx: upgrade to 2.0.19. Exact commands for each OS are on this page.

Q: Is CVE-2024-21664 being exploited?

CVE-2024-21664 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-21664 affect?

CVE-2024-21664 affects jwx. Severity is medium (CVSS 4.3). 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

Q: How urgent is CVE-2024-21664?

Priority 35/100. Public exploit reference

Routine

MEDIUM 4.3UPGRADE

CVE-2024-21664 is a medium-severity flaw (CVSS 4.3) affecting jwx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-476
Published	2024-01-09
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: lestrrat-go

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-01-09 20:15 UTCPublished CVE record published
2026-06-17 07:09 UTCUpdated Record last modified

lestrrat-go jwx UPGRADE

Affected: < 2.0.19

Fixed in: 2.0.19

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jwx || rpm -q jwx || jwx --version

2. UPGRADE to 2.0.19 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jwx

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jwx

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-21664?

jwx: upgrade to 2.0.19. Exact commands for each OS are on this page.

Is CVE-2024-21664 being exploited?

CVE-2024-21664 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-21664 affect?

CVE-2024-21664 affects jwx. Severity is medium (CVSS 4.3). 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

How urgent is CVE-2024-21664?

Priority 35/100. Public exploit reference

Related CVEs

CVE-2024-28122 MEDIUM 6.8 UPGRADE JWX is Go module implementing various JWx (JWA/JWE/JWK/JWS/JWT, otherwise known as JOSE) technologies
CVE-2023-49290 MEDIUM 5.3 UPGRADE lestrrat-go/jwx is a Go module implementing various JWx (JWA/JWE/JWK/JWS/JWT, otherwise known as JOSE) technol

References

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