Red Hat Security Advisory: compat-openssl11 security update
Affects Red Hat compat-openssl11Source GCVE Database
Not known to be exploited.
Data as of 29 Oct 2026, 08:12 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 4.0% chance of exploitation in 30 days – higher than 90% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 23 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
Public exploit code: GitHub proofs of concept
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), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
AI-suggested
Red Hat has released an updated compat-openssl11 package (version 1.1.1k-5.el9_8.4) that fixes the heap use-after-free vulnerability. Users of Red Hat Enterprise Linux 9 should apply this update promptly. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigations are specified or required beyond applying the official update.
Description
A heap use-after-free vulnerability exists in the OpenSSL PKCS7_verify() function in the compat-openssl11 package used by Red Hat Enterprise Linux 9. This flaw could potentially lead to memory corruption. Red Hat has issued a security update to address this issue in the compat-openssl11 package. The update is rated as Important by Red Hat Product Security.