🛡️ CVE-2026-66141 on Debian 12 (Root.io) — exim4

Distribution advisory

This page covers CVE-2026-66141 as tracked by Debian 12 (Root.io), for the package exim4. The fix is available in version 4.96-15+deb12u10.aikido.1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high. (rating taken from the base CVE record.)

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

• Attack vector: Local — a local account, shell or session on the host is needed.
• Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
• Privileges required: None — an unauthenticated stranger can try it.
• User interaction: None — nobody has to be tricked into anything.
• Scope: Unchanged — the damage stays inside the vulnerable component.
• Confidentiality impact: High — total loss, or loss the attacker controls.
• Integrity impact: High — total loss, or loss the attacker controls.
• Availability impact: High — total loss, or loss the attacker controls.

Weakness class

ROOT-OS-DEBIAN-12-CVE-2026-66141 is classified as CWE-829: Inclusion of Functionality from Untrusted Control Sphere. Code is loaded from a source outside the product's control, so that source can change what runs.

Affected software

ROOT-OS-DEBIAN-12-CVE-2026-66141 is recorded against 2 packages.

• exim4 (fixed in 4.96-15+deb12u10.aikido.1)
• rootio-exim4 (fixed in 4.96-15+deb12u10.aikido.1)

Timeline and source

Published on 5 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

Other advisories for this package

exim4 has other advisories on record. If you are patching this one, these are worth checking on the same host:

• ROOT-OS-DEBIAN-12-CVE-2026-66140 (8.0 High, published 5 Aug 2026)
• UBUNTU-CVE-2026-66141 (published 24 Jul 2026)
• UBUNTU-CVE-2026-66140 (published 24 Jul 2026)
• DEBIAN-CVE-2026-66141 (published 24 Jul 2026)
• DEBIAN-CVE-2026-66140 (published 24 Jul 2026)
• USN-8590-1 (published 22 Jul 2026)
• USN-6455-2 (published 10 Jun 2026)
• USN-8382-1 (published 3 Jun 2026)

Same weakness in other software

These advisories are the same class of weakness (CWE-829: Inclusion of Functionality from Untrusted Control Sphere) in other software:

• CVE-2026-49986 (8.0 High, published 14 Aug 2026)
• CVE-2026-66843 (6.1 Medium, published 6 Aug 2026)
• CVE-2026-67623 (8.8 High, published 5 Aug 2026)
• CVE-2026-66141 (7.4 High, published 24 Jul 2026)
• CVE-2026-59865 (9.5 Critical, published 24 Jul 2026)
• CVE-2026-64805 (8.4 High, published 23 Jul 2026)
• CVE-2026-64804 (8.4 High, published 23 Jul 2026)
• CVE-2026-64811 (7.8 High, published 23 Jul 2026)

Details

Affected Packages

References