apt: On Debian, Ubuntu, and derivative Linux distributions, an on-path attacker who can manipulate the HTTP traffic (inclu...
CVE-2026-109518 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2026-109518, released November 4, 2026. It is not reported as exploited. Patch Radar priority: High.
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
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| apt · Debian 12.15 (bookworm) | 2.6.2 | DEBIAN-CVE-2026-109518 | Nov 4, 2026 |
| apt · Debian 13.5 (trixie) | 3.0.4 | DEBIAN-CVE-2026-109518 | Nov 4, 2026 |
| apt · Debian 14 | 3.3.6 | DEBIAN-CVE-2026-109518 | Nov 4, 2026 |
| apt · Ubuntu 18.04.6 LTS (bionic) | 1.6.19+esm1 | apt 1.6.19+esm1 | Nov 6, 2026 |
| apt · Ubuntu 20.04 LTS (focal) | 2.0.12+esm1 | apt 2.0.12+esm1 | Nov 6, 2026 |
| apt · Ubuntu 22.04.1 LTS (jammy) | 2.4.15ubuntu0.1 | apt 2.4.15ubuntu0.1 | Nov 6, 2026 |
| apt · Ubuntu 24.04.5 LTS (noble) | 2.8.4ubuntu0.1 | apt 2.8.4ubuntu0.1 | Nov 5, 2026 |
| apt · Ubuntu 26.04.1 LTS (resolute) | 3.2.1ubuntu0.1 | apt 3.2.1ubuntu0.1 | Nov 7, 2026 |
| apt-transport-https · Ubuntu 18.04.6 LTS (bionic) | 1.6.19+esm1 | apt-transport-https 1.6.19+esm1 | Nov 6, 2026 |
| apt-transport-https · Ubuntu 20.04 LTS (focal) | 2.0.12+esm1 | apt-transport-https 2.0.12+esm1 | Nov 6, 2026 |
| apt-transport-https · Ubuntu 22.04.1 LTS (jammy) | 2.4.15ubuntu0.1 | apt-transport-https 2.4.15ubuntu0.1 | Nov 6, 2026 |
| apt-transport-https · Ubuntu 24.04.5 LTS (noble) | 2.8.4ubuntu0.1 | apt-transport-https 2.8.4ubuntu0.1 | Nov 5, 2026 |
| apt-transport-https · Ubuntu 26.04.1 LTS (resolute) | 3.2.1ubuntu0.1 | apt-transport-https 3.2.1ubuntu0.1 | Nov 7, 2026 |
| apt-utils · Ubuntu 18.04.6 LTS (bionic) | 1.6.19+esm1 | apt-utils 1.6.19+esm1 | Nov 6, 2026 |
| apt-utils · Ubuntu 20.04 LTS (focal) | 2.0.12+esm1 | apt-utils 2.0.12+esm1 | Nov 6, 2026 |
| apt-utils · Ubuntu 22.04.1 LTS (jammy) | 2.4.15ubuntu0.1 | apt-utils 2.4.15ubuntu0.1 | Nov 6, 2026 |
| apt-utils · Ubuntu 24.04.5 LTS (noble) | 2.8.4ubuntu0.1 | apt-utils 2.8.4ubuntu0.1 | Nov 5, 2026 |
| apt-utils · Ubuntu 26.04.1 LTS (resolute) | 3.2.1ubuntu0.1 | apt-utils 3.2.1ubuntu0.1 | Nov 7, 2026 |
| libapt-inst2.0 · Ubuntu 18.04.6 LTS (bionic) | 1.6.19+esm1 | libapt-inst2.0 1.6.19+esm1 | Nov 6, 2026 |
| libapt-pkg5.0 · Ubuntu 18.04.6 LTS (bionic) | 1.6.19+esm1 | libapt-pkg5.0 1.6.19+esm1 | Nov 6, 2026 |
| libapt-pkg6.0 · Ubuntu 20.04 LTS (focal) | 2.0.12+esm1 | libapt-pkg6.0 2.0.12+esm1 | Nov 6, 2026 |
| libapt-pkg6.0 · Ubuntu 22.04.1 LTS (jammy) | 2.4.15ubuntu0.1 | libapt-pkg6.0 2.4.15ubuntu0.1 | Nov 6, 2026 |
| libapt-pkg6.0t64 · Ubuntu 24.04.5 LTS (noble) | 2.8.4ubuntu0.1 | libapt-pkg6.0t64 2.8.4ubuntu0.1 | Nov 5, 2026 |
| libapt-pkg7.0 · Ubuntu 26.04.1 LTS (resolute) | 3.2.1ubuntu0.1 | libapt-pkg7.0 3.2.1ubuntu0.1 | Nov 7, 2026 |
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