CVE-2026-40684
Fixed in a distro release EPSS <1%CVSS 5.9
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.
Products: exim
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | exim | 4.99.5-r0 |
| Chainguard | exim-cdb | 4.99.5-r0 |
| Chainguard | exim-dbmdb | 4.99.5-r0 |
| Chainguard | exim-dnsdb | 4.99.5-r0 |
| Chainguard | exim-doc | 4.99.5-r0 |
| Chainguard | exim-mysql | 4.99.5-r0 |
| Chainguard | exim-pgsql | 4.99.5-r0 |
| Chainguard | exim-scripts | 4.99.5-r0 |
| Chainguard | exim-sqlite | 4.99.5-r0 |
| Chainguard | exim-utils | 4.99.5-r0 |
| Debian 12 | exim4 | 4.96-15+deb12u9 |
| Debian 13 | exim4 | 4.98.2-1+deb13u2 |
| Debian 14 | exim4 | 4.99.2-1 |
| Wolfi | exim | 4.99.5-r0 |
| Wolfi | exim-cdb | 4.99.5-r0 |
| Wolfi | exim-dbmdb | 4.99.5-r0 |
| Wolfi | exim-dnsdb | 4.99.5-r0 |
| Wolfi | exim-doc | 4.99.5-r0 |
| Wolfi | exim-mysql | 4.99.5-r0 |
| Wolfi | exim-pgsql | 4.99.5-r0 |
| Wolfi | exim-scripts | 4.99.5-r0 |
| Wolfi | exim-sqlite | 4.99.5-r0 |
| Wolfi | exim-utils | 4.99.5-r0 |