Off-by-one Error Affecting vdukhovni/postfix package, versions [2.3,3.8.16)[3.9,3.9.10)[3.10,3.10.9)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published5 May 2026
- disclosed4 May 2026
- creditUnknown
Introduced: 4 May 2026
CVE-2026-43964 (opens in a new tab)How to fix?
Upgrade vdukhovni/postfix to version 3.8.16, 3.9.10, 3.10.9 or higher.
Overview
Affected versions of this package are vulnerable to Off-by-one Error due to improper handling of enhanced status codes that do not include text after the third number. An attacker can cause the process to crash by sending a specially crafted enhanced status code.