# CVE-2026-109518: 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. - Web page: https://patchblox.com/security/cve/CVE-2026-109518 - Priority: High - CVSS: n/a (High) - EPSS: 0.0093 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Nov 4, 2026 ## Description 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 | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | apt Debian 12.15 (bookworm) | 2.6.2 | [DEBIAN-CVE-2026-109518](https://patchblox.com/security/data/fix/linux/debian-cve-2026-109518.md) | Nov 4, 2026 | | Linux | apt Debian 13.5 (trixie) | 3.0.4 | [DEBIAN-CVE-2026-109518](https://patchblox.com/security/data/fix/linux/debian-cve-2026-109518.md) | Nov 4, 2026 | | Linux | apt Debian 14 | 3.3.6 | [DEBIAN-CVE-2026-109518](https://patchblox.com/security/data/fix/linux/debian-cve-2026-109518.md) | Nov 4, 2026 | | Linux | apt Ubuntu 18.04.6 LTS (bionic) | 1.6.19+esm1 | [apt 1.6.19+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-apt-1.6.19-esm1.md) | Nov 6, 2026 | | Linux | apt Ubuntu 20.04 LTS (focal) | 2.0.12+esm1 | [apt 2.0.12+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-apt-2.0.12-esm1.md) | Nov 6, 2026 | | Linux | apt Ubuntu 22.04.1 LTS (jammy) | 2.4.15ubuntu0.1 | [apt 2.4.15ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-apt-2.4.15ubuntu0.1.md) | Nov 6, 2026 | | Linux | apt Ubuntu 24.04.5 LTS (noble) | 2.8.4ubuntu0.1 | [apt 2.8.4ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-apt-2.8.4ubuntu0.1.md) | Nov 5, 2026 | | Linux | apt Ubuntu 26.04.1 LTS (resolute) | 3.2.1ubuntu0.1 | [apt 3.2.1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-apt-3.2.1ubuntu0.1.md) | Nov 7, 2026 | | Linux | apt-transport-https Ubuntu 18.04.6 LTS (bionic) | 1.6.19+esm1 | [apt-transport-https 1.6.19+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-apt-transport-https-1.6.19-esm1.md) | Nov 6, 2026 | | Linux | apt-transport-https Ubuntu 20.04 LTS (focal) | 2.0.12+esm1 | [apt-transport-https 2.0.12+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-apt-transport-https-2.0.12-esm1.md) | Nov 6, 2026 | | Linux | apt-transport-https Ubuntu 22.04.1 LTS (jammy) | 2.4.15ubuntu0.1 | [apt-transport-https 2.4.15ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-apt-transport-https-2.4.15ubuntu0.1.md) | Nov 6, 2026 | | Linux | apt-transport-https Ubuntu 24.04.5 LTS (noble) | 2.8.4ubuntu0.1 | [apt-transport-https 2.8.4ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-apt-transport-https-2.8.4ubuntu0.1.md) | Nov 5, 2026 | | Linux | apt-transport-https Ubuntu 26.04.1 LTS (resolute) | 3.2.1ubuntu0.1 | [apt-transport-https 3.2.1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-apt-transport-https-3.2.1ubuntu0.1.md) | Nov 7, 2026 | | Linux | apt-utils Ubuntu 18.04.6 LTS (bionic) | 1.6.19+esm1 | [apt-utils 1.6.19+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-apt-utils-1.6.19-esm1.md) | Nov 6, 2026 | | Linux | apt-utils Ubuntu 20.04 LTS (focal) | 2.0.12+esm1 | [apt-utils 2.0.12+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-apt-utils-2.0.12-esm1.md) | Nov 6, 2026 | | Linux | apt-utils Ubuntu 22.04.1 LTS (jammy) | 2.4.15ubuntu0.1 | [apt-utils 2.4.15ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-apt-utils-2.4.15ubuntu0.1.md) | Nov 6, 2026 | | Linux | apt-utils Ubuntu 24.04.5 LTS (noble) | 2.8.4ubuntu0.1 | [apt-utils 2.8.4ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-apt-utils-2.8.4ubuntu0.1.md) | Nov 5, 2026 | | Linux | apt-utils Ubuntu 26.04.1 LTS (resolute) | 3.2.1ubuntu0.1 | [apt-utils 3.2.1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-apt-utils-3.2.1ubuntu0.1.md) | Nov 7, 2026 | | Linux | libapt-inst2.0 Ubuntu 18.04.6 LTS (bionic) | 1.6.19+esm1 | [libapt-inst2.0 1.6.19+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libapt-inst2.0-1.6.19-esm1.md) | Nov 6, 2026 | | Linux | libapt-pkg5.0 Ubuntu 18.04.6 LTS (bionic) | 1.6.19+esm1 | [libapt-pkg5.0 1.6.19+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libapt-pkg5.0-1.6.19-esm1.md) | Nov 6, 2026 | | Linux | libapt-pkg6.0 Ubuntu 20.04 LTS (focal) | 2.0.12+esm1 | [libapt-pkg6.0 2.0.12+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libapt-pkg6.0-2.0.12-esm1.md) | Nov 6, 2026 | | Linux | libapt-pkg6.0 Ubuntu 22.04.1 LTS (jammy) | 2.4.15ubuntu0.1 | [libapt-pkg6.0 2.4.15ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libapt-pkg6.0-2.4.15ubuntu0.1.md) | Nov 6, 2026 | | Linux | libapt-pkg6.0t64 Ubuntu 24.04.5 LTS (noble) | 2.8.4ubuntu0.1 | [libapt-pkg6.0t64 2.8.4ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libapt-pkg6.0t64-2.8.4ubuntu0.1.md) | Nov 5, 2026 | | Linux | libapt-pkg7.0 Ubuntu 26.04.1 LTS (resolute) | 3.2.1ubuntu0.1 | [libapt-pkg7.0 3.2.1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libapt-pkg7.0-3.2.1ubuntu0.1.md) | Nov 7, 2026 | --- Data as of 2026-11-09T19:38:12Z UTC. 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