CVE-2026-40684
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.
Zwakheid
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.
Getroffen producten
- exim exim
Bronnen
- https://code.exim.org/exim/exim/commit/628bbaca7672748d941a12e7cd5f0122a4e18c81
- https://exim.org/static/doc/security/CVE-2026-40684.txt
- https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40684.assessment
- https://www.openwall.com/lists/oss-security/2026/04/30/21
- http://www.openwall.com/lists/oss-security/2026/05/01/11
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