Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L N N U N N H 7.5 .0049 40.3 —
AFFECTED Product Versions Fixed Postfix 2.3 – —
TIMELINE May 4 Reserved by mitre May 4 Published (CNA: mitre) Aug 7 RESCORED — CVE-2026-43964 (Postfix). CVSS 3.7 → 7.5 (NVD).
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.
| Date | Event | Detail |
|---|---|---|
| May 4, 2026 | Reserved | Reserved by mitre |
| May 4, 2026 | Published | Published (CNA: mitre) |
| August 7, 2026 | RESCORED | RESCORED — CVE-2026-43964 (Postfix). CVSS 3.7 → 7.5 (NVD). |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| Postfix | Postfix | — | 2.3 | — |
Authoritative record: CVE-2026-43964 at cve.org
Vendors: postfix
Weaknesses: CWE-193
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-43964 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.