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.
https://nvd.nist.gov/vuln/detail/CVE-2026-40684
Exim CVE-2026-40684
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Starburst-David
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- Joined: Wed Feb 11, 2026 8:31 pm