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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 fix this vulnerability. Users of affected Red Hat Enterprise Linux 8.4 variants should apply the security update as described in the Red Hat advisory and article 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 and addressed by Red Hat. The flaw involves a buffer over-read triggered by a malformed enhanced status code. This issue impacts postfix packages used in Red Hat Enterprise Linux 8.4 variants. Red Hat has released an important security update to fix this vulnerability.

References

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