CVE-2026-109518
Severity not reportedOn Debian, Ubuntu, and derivative Linux distributions, an on-path attacker who can manipulate the HTTP traffic (including a malicious mirror or proxy) between…
On Debian, Ubuntu, and derivative Linux distributions, an on-path attacker who can manipulate the HTTP traffic (including a malicious mirror or proxy) between an APT client and an archive server triggered by a package install can trick the client into installing an attacker-controlled unverified package and achieve remote code execution with root privileges. The vulnerability is caused by the reuse of hard links and requires the client to follow redirects and retry the download of package files. It requires the client to have a non-zero Acquire::Retries configuration setting; the value 3 is the default starting with Debian 12 (bookworm) and Ubuntu 22.04 LTS (Jammy Jellyfish), so older releases are unaffected in a default configuration
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://lists.debian.org/debian-security-announce/2026/msg00526.html security@ubuntu.com
- https://ubuntu.com/security/notices/USN-8996-1 security@ubuntu.com
- http://www.openwall.com/lists/oss-security/2026/11/04/12 af854a3a-2127-422b-91ae-364da2661108
- https://lists.debian.org/debian-lts-announce/2026/11/msg00004.html af854a3a-2127-422b-91ae-364da2661108