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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 11 Nov 2026, 11:23 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 15% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
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 11 Nov 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.

AI-suggested

Red Hat has released an official security update for cjose in Red Hat Enterprise Linux 10 that addresses this vulnerability. Users should apply the update as detailed in Red Hat advisory RHSA-2026:98074 and the referenced article https://access.redhat.com/articles/11258 to remediate the issue.

Description

A critical security vulnerability (CVE-2026-53939) was identified in the cjose C library, which implements Javascript Object Signing and Encryption (JOSE). The flaw involves the use of an all-zero Content Encryption Key for AES-CBC-HMAC JWE encryption, potentially compromising encryption security. Red Hat has issued an update for cjose in Red Hat Enterprise Linux 10 to address this issue.

References

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