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CVE-2026-53939VulnerabilityPublished

Red Hat Security Advisory: cjose security update

Affects Red Hat cjoseSource GCVE Database

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Authoritative record:CVE-2026-53939· Critical 9.1

Not known to be exploited · CVSS 9.1 Critical : upgrade Red Hat cjose to 0.6.2.6 as a priority.

Data as of 29 Oct 2026, 22:47 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 0.6.2.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade cjose and openidc/cjose to 0.6.2.6.

Affected software

ProductAffectedFixed in
OpenIDCcjoseAffected
  • >=0.6.1 <0.6.2.6
Fixed in
  • 0.6.2.6
GitHubopenidc/cjosepkg:github/openidc/cjoseOther threatsAffected
  • <0.6.2.6
Fixed in
  • 0.6.2.6

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

CJose is C library implementing the Javascript Object Signing and Encryption (JOSE). Security Fix(es): * cjose: OpenIDC/cjose uses all-zero Content Encryption Key for AES-CBC-HMAC JWE encryption (CVE-2026-53939) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

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