Red Hat Security Advisory: cjose security update
Affects Red Hat cjoseSource GCVE Database
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
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 9 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| OpenIDCcjose | Affected
| Fixed in
|
GitHubopenidc/cjosepkg:github/openidc/cjoseOther threats | Affected
| Fixed in
|
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.