# CVE-2026-42008: dovecot: Forwarding information received from a host listed as a trusted proxy is not kept separate from Dovecot's own authent... CVE-2026-42008 is fixed in 12 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. - Web page: https://patchblox.com/security/cve/CVE-2026-42008 - Priority: Routine - CVSS: 4.3 (medium) - EPSS: 0.0024 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 28, 2026 ## Description Forwarding information received from a host listed as a trusted proxy is not kept separate from Dovecot's own authentication fields, so a value sent by that host can be injected as an internal authentication field. Any host permitted to act as a trusted proxy can authenticate as any user without knowing that user's password. This affects deployments whose password database honours a field that permits authentication without a password. 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 | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | dovecot Debian 12.15 (bookworm) | 1:2.3.19.1+dfsg1-2.1+deb12u7 | [DEBIAN-CVE-2026-42008](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42008.md) | Sep 10, 2026 | | Linux | dovecot Debian 13.5 (trixie) | 1:2.4.1+dfsg1-6+deb13u7 | [DEBIAN-CVE-2026-42008](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42008.md) | Sep 10, 2026 | | Linux | dovecot Debian 14 | 1:2.4.5+dfsg1-1 | [DEBIAN-CVE-2026-42008](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42008.md) | Sep 10, 2026 | | Linux | dovecot Fedora 43 | 1:2.4.5-1.fc43 | [FEDORA-2026-E8A6485109](https://patchblox.com/security/data/fix/linux/fedora-2026-e8a6485109.md) | Sep 10, 2026 | | Linux | dovecot amzn 2023 | 1:2.3.20-1.amzn2023.0.4 | [ALAS2023-2026-3109](https://patchblox.com/security/data/fix/linux/alas2023-2026-3109.md) | Sep 28, 2026 | | Linux | dovecot-debuginfo Fedora 43 | 1:2.4.5-1.fc43 | [FEDORA-2026-E8A6485109](https://patchblox.com/security/data/fix/linux/fedora-2026-e8a6485109.md) | Sep 10, 2026 | | Linux | dovecot-debuginfo amzn 2023 | 1:2.3.20-1.amzn2023.0.4 | [ALAS2023-2026-3109](https://patchblox.com/security/data/fix/linux/alas2023-2026-3109.md) | Sep 28, 2026 | | Linux | dovecot-debugsource Fedora 43 | 1:2.4.5-1.fc43 | [FEDORA-2026-E8A6485109](https://patchblox.com/security/data/fix/linux/fedora-2026-e8a6485109.md) | Sep 10, 2026 | | Linux | dovecot-debugsource amzn 2023 | 1:2.3.20-1.amzn2023.0.4 | [ALAS2023-2026-3109](https://patchblox.com/security/data/fix/linux/alas2023-2026-3109.md) | Sep 28, 2026 | | Linux | dovecot-devel Fedora 43 | 1:2.4.5-1.fc43 | [FEDORA-2026-E8A6485109](https://patchblox.com/security/data/fix/linux/fedora-2026-e8a6485109.md) | Sep 10, 2026 | | Linux | dovecot-devel amzn 2023 | 1:2.3.20-1.amzn2023.0.4 | [ALAS2023-2026-3109](https://patchblox.com/security/data/fix/linux/alas2023-2026-3109.md) | Sep 28, 2026 | | Linux | dovecot-mysql Fedora 43 | 1:2.4.5-1.fc43 | [FEDORA-2026-E8A6485109](https://patchblox.com/security/data/fix/linux/fedora-2026-e8a6485109.md) | Sep 10, 2026 | | Linux | dovecot-mysql amzn 2023 | 1:2.3.20-1.amzn2023.0.4 | [ALAS2023-2026-3109](https://patchblox.com/security/data/fix/linux/alas2023-2026-3109.md) | Sep 28, 2026 | | Linux | dovecot-mysql-debuginfo Fedora 43 | 1:2.4.5-1.fc43 | [FEDORA-2026-E8A6485109](https://patchblox.com/security/data/fix/linux/fedora-2026-e8a6485109.md) | Sep 10, 2026 | | Linux | dovecot-mysql-debuginfo amzn 2023 | 1:2.3.20-1.amzn2023.0.4 | [ALAS2023-2026-3109](https://patchblox.com/security/data/fix/linux/alas2023-2026-3109.md) | Sep 28, 2026 | | Linux | dovecot-pgsql Fedora 43 | 1:2.4.5-1.fc43 | [FEDORA-2026-E8A6485109](https://patchblox.com/security/data/fix/linux/fedora-2026-e8a6485109.md) | Sep 10, 2026 | | Linux | dovecot-pgsql amzn 2023 | 1:2.3.20-1.amzn2023.0.4 | [ALAS2023-2026-3109](https://patchblox.com/security/data/fix/linux/alas2023-2026-3109.md) | Sep 28, 2026 | | Linux | dovecot-pgsql-debuginfo Fedora 43 | 1:2.4.5-1.fc43 | [FEDORA-2026-E8A6485109](https://patchblox.com/security/data/fix/linux/fedora-2026-e8a6485109.md) | Sep 10, 2026 | | Linux | dovecot-pgsql-debuginfo amzn 2023 | 1:2.3.20-1.amzn2023.0.4 | [ALAS2023-2026-3109](https://patchblox.com/security/data/fix/linux/alas2023-2026-3109.md) | Sep 28, 2026 | | Linux | dovecot-pigeonhole Fedora 43 | 1:2.4.5-1.fc43 | [FEDORA-2026-E8A6485109](https://patchblox.com/security/data/fix/linux/fedora-2026-e8a6485109.md) | Sep 10, 2026 | | Linux | dovecot-pigeonhole amzn 2023 | 1:2.3.20-1.amzn2023.0.4 | [ALAS2023-2026-3109](https://patchblox.com/security/data/fix/linux/alas2023-2026-3109.md) | Sep 28, 2026 | | Linux | dovecot-pigeonhole-debuginfo Fedora 43 | 1:2.4.5-1.fc43 | [FEDORA-2026-E8A6485109](https://patchblox.com/security/data/fix/linux/fedora-2026-e8a6485109.md) | Sep 10, 2026 | | Linux | dovecot-pigeonhole-debuginfo amzn 2023 | 1:2.3.20-1.amzn2023.0.4 | [ALAS2023-2026-3109](https://patchblox.com/security/data/fix/linux/alas2023-2026-3109.md) | Sep 28, 2026 | | Linux | dovecot23 sles 15.6 | 2.3.21.1-150200.76.1 | [SUSE-SU-2026:4139-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4139-1.md) | Sep 14, 2026 | | Linux | dovecot23 sles 15.7 | 2.3.21.1-150200.76.1 | [SUSE-SU-2026:4139-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4139-1.md) | Sep 14, 2026 | | Linux | dovecot24 opensuse-leap 16.0 | 2.4.4-160000.2.1 | [OPENSUSE-SU-2026:21720-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21720-1.md) | Sep 1, 2026 | | Linux | dovecot24 sles 16.0 | 2.4.4-160000.2.1 | [SUSE-SU-2026:23595-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23595-1.md) | Sep 1, 2026 | --- Data as of 2026-11-08T00:53:09Z UTC. 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