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I. Basic Information for CVE-2026-40684
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Description
In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance when malformed DNS data is present in PTR records. This is caused by a dn_expand oddity in octal printing.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
特定函数功能的不正确供给
Source: NVD (National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
EximExim 0 ~ 4.99.2 -
II. Public POCs for CVE-2026-40684
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III. Intelligence Information for CVE-2026-40684
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IV. Related Vulnerabilities
Same product: Exim
Same vendor: Exim
Same weakness: CWE-684
V. Comments for CVE-2026-40684

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