Postfix 3.10.x < 3.10.12 - CraftedSignal Threat Feedhttps://feed.craftedsignal.io/products/postfix-3.10.x--3.10.12/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioTue, 07 Jul 2026 13:57:06 +0000Multiple Vulnerabilities in Postfix Mail Serverhttps://feed.craftedsignal.io/briefs/2026-07-postfix-vulnerabilities/Tue, 07 Jul 2026 13:57:06 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-07-postfix-vulnerabilities/Multiple vulnerabilities have been identified in various versions of the Postfix mail server, potentially allowing an attacker to cause a denial of service (DoS) and other unspecified security issues, requiring immediate patching across affected installations.CERT-FR has issued an advisory regarding multiple vulnerabilities discovered in the Postfix mail transfer agent (MTA). These flaws affect a wide range of Postfix versions, including 3.10.x prior to 3.10.12, 3.11.x prior to 3.11.5, 3.6.x prior to 3.6.19, 3.7.x prior to 3.7.21, 3.8.x prior to 3.8.19, 3.9.x prior to 3.9.13, and all versions prior to 3.5.26. While specific CVEs are not detailed in the advisory, the primary identified risk is a denial of service (DoS), alongside an unspecified security problem. These vulnerabilities could allow a remote or local attacker to disrupt mail services, potentially leading to significant operational impact. Given Postfix's prevalence as a critical component in many email infrastructures, patching these issues is crucial for maintaining mail flow and system integrity.

Attack Chain

(No specific attack chain is described in the source material, as this is a vulnerability disclosure without observed exploitation details.)

Impact

The primary observed impact of these vulnerabilities is the potential for a denial of service. Exploitation of such a vulnerability against a Postfix server could render the mail service inoperable, leading to significant disruption of email communication for an organization. This can result in business downtime, loss of critical data, and reputational damage. The advisory also mentions an "unspecified security problem," indicating that attackers might be able to achieve other detrimental outcomes beyond just DoS, depending on the nature of the underlying flaws. Affected organizations should prioritize patching to prevent service interruption and potential further compromise.

Recommendation

  • Immediately refer to the Postfix security bulletin (http://www.postfix.org/announcements/postfix-3.11.5.html) for detailed patch instructions and apply updates to all affected Postfix installations.
  • Ensure Postfix installations are updated to versions 3.10.12, 3.11.5, 3.6.19, 3.7.21, 3.8.19, 3.9.13, or 3.5.26, or newer, depending on your current major version.
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