Red Hat Security Advisory: postfix security update
Affects Red Hat postfixSource GCVE Database
Not known to be exploited.
Data as of 6 Nov 2026, 02:20 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Exploitation evidence
Disclosed: evidence found.
CVE published 6 Aug 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 5 Nov 2026.
What to do
AI-suggested
Red Hat has released updated postfix packages for Red Hat Enterprise Linux 8.6 that fix this vulnerability. Users should apply the official security update as described in the Red Hat advisory (RHSA-2026:50963) and the referenced article (https://access.redhat.com/articles/11258) to remediate the issue. No additional mitigation steps are indicated beyond applying the patch.
Description
A security vulnerability (CVE-2026-43964) has been identified in the postfix Mail Transport Agent (MTA) used in Red Hat Enterprise Linux 8.6. The flaw involves a buffer over-read triggered by a malformed enhanced status code. Red Hat has issued an important security advisory and released updated postfix packages to address this issue.