dovecot: A host listed as a trusted proxy can send forwarding information containing a NUL byte, which crashes the login proce...
CVE-2026-42395 is fixed in 3 products on 1 platform, first by SUSE-SU-2026:23595-1, released September 1, 2026. It is not reported as exploited. Patch Radar priority: Routine.
A host listed as a trusted proxy can send forwarding information containing a NUL byte, which crashes the login process on the following login attempt. The login process is terminated, which can cause degradation or denial of service for logins. Deployments that do not configure trusted proxies are not affected. Restrict the list of trusted proxy networks to hosts that are fully under your control. Update to non-vulnerable version. No publicly available exploits are known.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| dovecot · Debian 12.15 (bookworm) | 1:2.3.19.1+dfsg1-2.1+deb12u7 | DEBIAN-CVE-2026-42395 | Sep 10, 2026 |
| dovecot · Debian 13.5 (trixie) | 1:2.4.1+dfsg1-6+deb13u7 | DEBIAN-CVE-2026-42395 | Sep 10, 2026 |
| dovecot · Debian 14 | 1:2.4.5+dfsg1-1 | DEBIAN-CVE-2026-42395 | Sep 10, 2026 |
| dovecot23 · sles 15.6 | 2.3.21.1-150200.76.1 | SUSE-SU-2026:4139-1 | Sep 14, 2026 |
| dovecot23 · sles 15.7 | 2.3.21.1-150200.76.1 | SUSE-SU-2026:4139-1 | Sep 14, 2026 |
| dovecot24 · opensuse-leap 16.0 | 2.4.4-160000.2.1 | OPENSUSE-SU-2026:21720-1 | Sep 1, 2026 |
| dovecot24 · sles 16.0 | 2.4.4-160000.2.1 | SUSE-SU-2026:23595-1 | Sep 1, 2026 |
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