CVE-2026-43964
high
CVSS v3
7.5
CVSS v4 NEW
—
VIR risk
7.5
Description
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.
Predictions
Exploit likelihood
83%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | fixed | 3.11.2-1 |
| debian | sid | fixed | 3.11.2-1 |
| debian | trixie | affected | |
| windows | affected | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| postfix | postfix | {"endExcluding":"3.8.16"} | 3.8.16 |
References
- https://www.mail-archive.com/postfix-announce@postfix.org/msg00110.html
- http://www.openwall.com/lists/oss-security/2026/05/04/30
- https://www.suse.com/security/cve/CVE-2026-43964.html
- https://security-tracker.debian.org/tracker/CVE-2026-43964
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43964
CWEs
CWE-193
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.