CVE-2026-43964

HIGHNVD 7.53.7▼
EchelonGraph scoreMEDIUM confidence

Score 3.7 from GitHub Security Advisory (severity: LOW) published 2026-05-04. NVD baseline CVSS 3.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
3.7(medium)
EPSS
33.4%
KEV
Not listed

Published

May 4, 2026

Last Modified

June 30, 2026

Advisory Details (8)

Auto-updated Jul 3, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 6",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43964.json
redhat Patch Available

2466488 – (CVE-2026-43964) CVE-2026-43964 postfix: buffer over-read via malformed enhanced status code

Affected: Red Hat Enterprise Linux 10

https://bugzilla.redhat.com/show_bug.cgi?id=2466488
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-43964
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:26205
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:25932
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:25930
generic

oss-security - Re: Fwd: [pfx] Postfix stable release 3.11.2 and legacy releases 3.10.9, 3.9.10, 3.8.16

http://www.openwall.com/lists/oss-security/2026/05/04/30
generic

[pfx-ann] Postfix stable release 3.11.2 and legacy releases 3.10.9, 3.9.10, 3.8.16

https://www.mail-archive.com/[email protected]/msg00110.html

Vendor Advisories for CVE-2026-43964(4)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupostfix-sqlite (3.6.4-1ubuntu1.4) @ jammy2026-06-14ubuntu
ubuntupostfix-pgsql (3.1.0-3ubuntu0.4+esm4) @ xenial2026-06-14ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 02:23 UTCEPSS rescore
  3. 2026-07-05 02:30 UTCEPSS rescore
  4. 2026-07-04 06:31 UTCEPSS rescore
  5. 2026-07-01 15:07 UTCEPSS rescore
  6. 2026-06-30 23:22 UTCEPSS rescore
  7. 2026-06-30 04:33 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  8. 2026-06-29 14:06 UTCEPSS rescore
  9. 2026-06-28 14:07 UTCEPSS rescore
  10. 2026-06-28 04:56 UTCEPSS rescore
  11. 2026-06-27 03:08 UTCEPSS rescore
  12. 2026-06-25 13:49 UTCEPSS rescore
  13. 2026-06-25 13:49 UTCEPSS rescore
  14. 2026-06-24 14:05 UTCEPSS rescore
  15. 2026-06-23 21:33 UTCEPSS rescore
  16. 2026-06-22 14:25 UTCEPSS rescore
  17. 2026-06-22 14:25 UTCEPSS rescore
  18. 2026-06-21 14:56 UTCEPSS rescore
  19. 2026-06-21 14:56 UTCEPSS rescore
  20. 2026-06-21 01:59 UTCEPSS rescore
  21. 2026-06-19 19:25 UTCEPSS rescore
  22. 2026-06-18 17:52 UTCEPSS rescore
  23. 2026-06-18 17:52 UTCEPSS rescore
  24. 2026-06-17 17:53 UTCEPSS rescore
  25. 2026-06-16 17:52 UTCEPSS rescore
Show 55 more
  1. 2026-06-15 17:49 UTCEPSS rescore
  2. 2026-06-14 08:03 UTCEG score recompute
  3. 2026-06-14 08:03 UTCVendor advisory
  4. 2026-06-14 08:03 UTCGHSA enrichment
  5. 2026-06-13 23:00 UTCEPSS rescore
  6. 2026-06-12 23:12 UTCEPSS rescore
  7. 2026-06-12 23:12 UTCEPSS rescore
  8. 2026-06-11 14:00 UTCEPSS rescore
  9. 2026-06-10 22:18 UTCEPSS rescore
  10. 2026-06-10 13:22 UTCEPSS rescore
  11. 2026-06-10 13:22 UTCEPSS rescore
  12. 2026-06-10 09:30 UTCEG score recompute
  13. 2026-06-10 09:30 UTCVendor advisory
  14. 2026-06-10 09:30 UTCGHSA enrichment
  15. 2026-06-08 14:17 UTCEPSS rescore
  16. 2026-06-08 14:17 UTCEPSS rescore
  17. 2026-06-07 15:25 UTCEPSS rescore
  18. 2026-06-07 15:25 UTCEPSS rescore
  19. 2026-06-07 09:40 UTCEG score recompute
  20. 2026-06-07 09:40 UTCVendor advisory
  21. 2026-06-07 09:40 UTCGHSA enrichment
  22. 2026-06-06 13:47 UTCEPSS rescore
  23. 2026-06-06 13:47 UTCEPSS rescore
  24. 2026-06-05 22:47 UTCEPSS rescore
  25. 2026-06-05 06:10 UTCEPSS rescore
  26. 2026-06-05 06:10 UTCEPSS rescore
  27. 2026-06-04 13:12 UTCEPSS rescore
  28. 2026-06-04 13:12 UTCEPSS rescore
  29. 2026-06-04 09:50 UTCEG score recompute
  30. 2026-06-04 09:50 UTCVendor advisory
  31. 2026-06-04 09:50 UTCGHSA enrichment
  32. 2026-06-02 20:13 UTCEPSS rescore
  33. 2026-06-01 13:52 UTCEPSS rescore
  34. 2026-06-01 13:52 UTCEPSS rescore
  35. 2026-06-01 09:58 UTCEG score recompute
  36. 2026-06-01 09:58 UTCVendor advisory
  37. 2026-06-01 09:58 UTCGHSA enrichment
  38. 2026-05-31 22:30 UTCEPSS rescore
  39. 2026-05-31 22:30 UTCEPSS rescore
  40. 2026-05-31 00:16 UTCEPSS rescore
  41. 2026-05-31 00:16 UTCEPSS rescore
  42. 2026-05-29 13:44 UTCEPSS rescore
  43. 2026-05-29 13:44 UTCEPSS rescore
  44. 2026-05-28 13:44 UTCEPSS rescore
  45. 2026-05-28 13:44 UTCEPSS rescore
  46. 2026-05-27 13:40 UTCEPSS rescore
  47. 2026-05-27 13:40 UTCEPSS rescore
  48. 2026-05-26 13:44 UTCEPSS rescore
  49. 2026-05-26 07:18 UTCEPSS rescore
  50. 2026-05-21 22:43 UTCEPSS rescore
  51. 2026-05-20 22:38 UTCEPSS rescore
  52. 2026-05-20 14:33 UTCEG score recompute
  53. 2026-05-20 14:33 UTCVendor advisory
  54. 2026-05-20 14:33 UTCGHSA enrichment
  55. 2026-05-20 11:22 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-43964?
CVE-2026-43964 is a high vulnerability published on May 4, 2026. 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.
When was CVE-2026-43964 disclosed?
CVE-2026-43964 was first published in the National Vulnerability Database on May 4, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43964 actively exploited?
CVE-2026-43964 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43964?
CVE-2026-43964 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 3.7.
How do I remediate CVE-2026-43964?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43964, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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