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CVE-2026-43964VulnerabilityPublished Updated

Red Hat Security Advisory: postfix security update

Affects Red Hat postfixSource GCVE Database

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Not known to be exploited.

Data as of 6 Nov 2026, 02:20 UTC

Severity
High

Rated by Threat Radar · No CVSS score from NVD or the CNA

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Aug 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 5 Nov 2026.

What to do

AI-suggested

Red Hat has released updated postfix packages that address this vulnerability. Users of Red Hat Enterprise Linux 10.0 Extended Update Support and related variants should apply the provided security update as described in the Red Hat advisory (https://access.redhat.com/articles/11258). No additional mitigation steps are indicated beyond applying the official patch.

Description

A security vulnerability (CVE-2026-43964) affecting the postfix Mail Transport Agent (MTA) has been identified. 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 for Red Hat Enterprise Linux 10.0 Extended Update Support and related variants. The vulnerability is rated as having a high severity impact. No CVSS score is provided. No known exploits in the wild have been reported. The vendor advisory includes updated packages to remediate the issue.

References

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