CVE-2026-43964
Low
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.
SeverityLow
CVSS3.7
Exploit probability—
ProductPostfix
PublishedMay 4, 2026
First seenMay 4, 2026
Weakness typeCWE-193CWE-193
How to fix
Update
- postfix postfix3.8.16, 3.9.10, 3.10.9 or later
Vendor advisories
- access.redhat.com/errata/RHSA-2026:57174
- access.redhat.com/errata/RHSA-2026:51436
- access.redhat.com/errata/RHSA-2026:25930
- access.redhat.com/errata/RHSA-2026:25932
- access.redhat.com/errata/RHSA-2026:26205
- access.redhat.com/errata/RHSA-2026:51034
- access.redhat.com/errata/RHSA-2026:50963
- access.redhat.com/errata/RHSA-2026:50964
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| postfix postfix | v < 3.8.16, 3.9.0 ≤ v < 3.9.10, 3.10.0 ≤ v < 3.10.9 | 3.8.16, 3.9.10, 3.10.9 |
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