Postfix before 3.8.16, 3.9 before 3.9.10, and 3.10 before 3.10.9 sometimes allows a buffer over-read and process crash via an enhanced status code that lacks text after the third number.
CVE-2026-43964 is a vulnerability affecting Postfix versions before 3. 8. 16, 3. 9 before 3. 9. 10, and 3. 10 before 3. 10. 9. It involves a buffer over-read and potential process crash triggered by an enhanced status code that lacks text after the third number.
AI Analysis
Technical Summary
This vulnerability in Postfix mail server software allows a buffer over-read and process crash when processing an enhanced status code missing text after the third numeric field. The issue affects multiple Postfix versions prior to 3.8.16, 3.9.10, and 3.10.9. The vulnerability is classified as CWE-193, indicating an off-by-one or similar boundary error. There is no CVSS score or vendor patch advisory currently available, and no known active exploitation has been reported. The affected versions include Microsoft and Azure Linux distributions as noted, but the exact impact on these platforms is not detailed.
Potential Impact
The vulnerability can cause a buffer over-read leading to a process crash in the Postfix mail server. This may result in denial of service conditions affecting mail delivery or server stability. There is no information on further exploitation or data compromise. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, administrators should monitor vendor communications for updates. No specific mitigations or workarounds are provided in the current advisory.
Postfix before 3.8.16, 3.9 before 3.9.10, and 3.10 before 3.10.9 sometimes allows a buffer over-read and process crash via an enhanced status code that lacks text after the third number.
Description
CVE-2026-43964 is a vulnerability affecting Postfix versions before 3. 8. 16, 3. 9 before 3. 9. 10, and 3. 10 before 3. 10. 9. It involves a buffer over-read and potential process crash triggered by an enhanced status code that lacks text after the third number.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Postfix mail server software allows a buffer over-read and process crash when processing an enhanced status code missing text after the third numeric field. The issue affects multiple Postfix versions prior to 3.8.16, 3.9.10, and 3.10.9. The vulnerability is classified as CWE-193, indicating an off-by-one or similar boundary error. There is no CVSS score or vendor patch advisory currently available, and no known active exploitation has been reported. The affected versions include Microsoft and Azure Linux distributions as noted, but the exact impact on these platforms is not detailed.
Potential Impact
The vulnerability can cause a buffer over-read leading to a process crash in the Postfix mail server. This may result in denial of service conditions affecting mail delivery or server stability. There is no information on further exploitation or data compromise. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, administrators should monitor vendor communications for updates. No specific mitigations or workarounds are provided in the current advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-43964
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- null
Threat ID: 6a21eb1ae29bf47b50d25cd3
Added to database: 6/4/2026, 9:16:10 PM
Last enriched: 6/4/2026, 9:19:18 PM
Last updated: 6/4/2026, 11:00:05 PM
Views: 5
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