CVE-2026-43964 (GCVE-0-2026-43964)

Vulnerability from cvelistv5 – Published: 2026-05-04 18:10 – Updated: 2026-08-20 12:31
VLAI
Summary
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.
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-04 19:49 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Postfix Postfix Affected: 2.3 , < 3.8.16 (custom)
Affected: 3.9 , < 3.9.10 (custom)
Affected: 3.10 , < 3.10.9 (custom)
    cpe:2.3:a:postfix:postfix:*:*:*:*:*:*:*:*
    cpe:2.3:a:postfix:postfix:*:*:*:*:*:*:*:*
    cpe:2.3:a:postfix:postfix:*:*:*:*:*:*:*:*
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 2:3.8.5-10.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 2:3.8.5-8.el10_0.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support Unaffected: 2:2.10.1-9.el7_9.1 , < * (rpm)
    cpe:/o:redhat:rhel_els:7
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 2:3.5.8-8.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
    cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 2:3.5.8-1.el8_4.1 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.4
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Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Unaffected: 2:3.5.8-1.el8_4.1 , < * (rpm)
    cpe:/a:redhat:rhel_eus_long_life:8.4
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Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 2:3.5.8-4.el8_6.1 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6
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Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 2:3.5.8-4.el8_6.1 , < * (rpm)
    cpe:/a:redhat:rhel_eus_long_life:8.6
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Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 2:3.5.8-4.el8_8.1 , < * (rpm)
    cpe:/a:redhat:rhel_tus:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 2:3.5.8-4.el8_8.1 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 2:3.5.25-3.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
Create a notification for this product.
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      "cveMetadata": "{\"cveId\": \"CVE-2026-43964\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-07T12:04:43.558Z\", \"dateReserved\": \"2026-05-04T18:10:10.120Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2026-05-04T18:10:10.509Z\", \"assignerShortName\": \"mitre\"}",
      "dataType": "CVE_RECORD",
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}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.