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CVE-2026-43964

Quick assessment

Affected
Postfix Postfix
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Postfix是Postfix开源的一个邮件传输代理软件。 Postfix 3.8.16之前版本、3.9.10之前版本和3.10.9之前版本存在安全漏洞，该漏洞源于增强状态码在第三位数字后缺少文本，可能导致缓冲区过度读取和进程崩溃。

CVSS 3.7 · Low EPSS 0.88% · P58

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 3

VendorProduct Version RangeStatus
Postfix Postfix 2.3< 3.8.16 affected
3.9< 3.9.10 affected
3.10< 3.10.9 affected
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I. Basic Information for CVE-2026-43964

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
Off-by-one错误
Source: CVE Program / CVE List V5
Vulnerability Title
Postfix 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Postfix是Postfix开源的一个邮件传输代理软件。 Postfix 3.8.16之前版本、3.9.10之前版本和3.10.9之前版本存在安全漏洞，该漏洞源于增强状态码在第三位数字后缺少文本，可能导致缓冲区过度读取和进程崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Postfix Postfix 2.3 ~ 3.8.16 -

II. Public POCs for CVE-2026-43964

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III. Intelligence Information for CVE-2026-43964

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Mailing List Discussions for CVE-2026-43964 (1)

IV. Related Vulnerabilities

Same weakness: CWE-193

V. Comments for CVE-2026-43964

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