# CVE-2025-6966: python-apt: NULL pointer dereference in TagSection.keys() in python-apt on APT-based Linux systems allows a local attacker to cau... CVE-2025-6966 is fixed in 15 products on 1 platform, first by python-apt 1.6.6ubuntu0.1~esm1, released December 4, 2025. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2025-6966 - Priority: Routine - CVSS: 5.5 (Medium) - EPSS: 0.0016 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Dec 4, 2025 ## Description NULL pointer dereference in TagSection.keys() in python-apt on APT-based Linux systems allows a local attacker to cause a denial of service (process crash) via a crafted deb822 file with a malformed non-UTF-8 key. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | apt Fedora 43 | 3.1.15-2.fc43 | [FEDORA-2026-1C47E433DF](https://patchblox.com/security/data/fix/linux/fedora-2026-1c47e433df.md) | Feb 16, 2026 | | Linux | apt-apidoc Fedora 43 | 3.1.15-2.fc43 | [FEDORA-2026-1C47E433DF](https://patchblox.com/security/data/fix/linux/fedora-2026-1c47e433df.md) | Feb 16, 2026 | | Linux | apt-debuginfo Fedora 43 | 3.1.15-2.fc43 | [FEDORA-2026-1C47E433DF](https://patchblox.com/security/data/fix/linux/fedora-2026-1c47e433df.md) | Feb 16, 2026 | | Linux | apt-debugsource Fedora 43 | 3.1.15-2.fc43 | [FEDORA-2026-1C47E433DF](https://patchblox.com/security/data/fix/linux/fedora-2026-1c47e433df.md) | Feb 16, 2026 | | Linux | apt-devel Fedora 43 | 3.1.15-2.fc43 | [FEDORA-2026-1C47E433DF](https://patchblox.com/security/data/fix/linux/fedora-2026-1c47e433df.md) | Feb 16, 2026 | | Linux | apt-doc Fedora 43 | 3.1.15-2.fc43 | [FEDORA-2026-1C47E433DF](https://patchblox.com/security/data/fix/linux/fedora-2026-1c47e433df.md) | Feb 16, 2026 | | Linux | apt-libs Fedora 43 | 3.1.15-2.fc43 | [FEDORA-2026-1C47E433DF](https://patchblox.com/security/data/fix/linux/fedora-2026-1c47e433df.md) | Feb 16, 2026 | | Linux | apt-libs-debuginfo Fedora 43 | 3.1.15-2.fc43 | [FEDORA-2026-1C47E433DF](https://patchblox.com/security/data/fix/linux/fedora-2026-1c47e433df.md) | Feb 16, 2026 | | Linux | apt-utils Fedora 43 | 3.1.15-2.fc43 | [FEDORA-2026-1C47E433DF](https://patchblox.com/security/data/fix/linux/fedora-2026-1c47e433df.md) | Feb 16, 2026 | | Linux | apt-utils-debuginfo Fedora 43 | 3.1.15-2.fc43 | [FEDORA-2026-1C47E433DF](https://patchblox.com/security/data/fix/linux/fedora-2026-1c47e433df.md) | Feb 16, 2026 | | Linux | python-apt Debian 11.6 (bullseye) | 2.2.1.1 | [DLA-4408-1](https://patchblox.com/security/data/fix/linux/dla-4408-1.md) | Dec 16, 2025 | | Linux | python-apt Debian 14 | 3.1.0 | [DEBIAN-CVE-2025-6966](https://patchblox.com/security/data/fix/linux/debian-cve-2025-6966.md) | Dec 5, 2025 | | Linux | python-apt Fedora 43 | 3.1.0-1.fc43 | [FEDORA-2026-1C47E433DF](https://patchblox.com/security/data/fix/linux/fedora-2026-1c47e433df.md) | Feb 16, 2026 | | Linux | python-apt Ubuntu 18.04.6 LTS (bionic) | 1.6.6ubuntu0.1~esm1 | [python-apt 1.6.6ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-apt-1.6.6ubuntu0.1-esm1.md) | Dec 4, 2025 | | Linux | python-apt Ubuntu 20.04 LTS (focal) | 2.0.1ubuntu0.20.04.1+esm1 | [python-apt 2.0.1ubuntu0.20.04.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-apt-2.0.1ubuntu0.20.04.1-esm1.md) | Dec 4, 2025 | | Linux | python-apt-common Ubuntu 18.04.6 LTS (bionic) | 1.6.6ubuntu0.1~esm1 | [python-apt-common 1.6.6ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-apt-common-1.6.6ubuntu0.1-esm1.md) | Dec 4, 2025 | | Linux | python-apt-common Ubuntu 20.04 LTS (focal) | 2.0.1ubuntu0.20.04.1+esm1 | [python-apt-common 2.0.1ubuntu0.20.04.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-apt-common-2.0.1ubuntu0.20.04.1-esm1.md) | Dec 4, 2025 | | Linux | python-apt-common Ubuntu 22.04.1 LTS (jammy) | 2.4.0ubuntu4.1 | [python-apt-common 2.4.0ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python-apt-common-2.4.0ubuntu4.1.md) | Dec 4, 2025 | | Linux | python-apt-common Ubuntu 24.04.5 LTS (noble) | 2.7.7ubuntu5.1 | [python-apt-common 2.7.7ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-python-apt-common-2.7.7ubuntu5.1.md) | Dec 4, 2025 | | Linux | python-apt-common Ubuntu 25.10 (questing) | 3.0.0ubuntu1.1 | [python-apt-common 3.0.0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-python-apt-common-3.0.0ubuntu1.1.md) | Dec 4, 2025 | | Linux | python-apt-debugsource Fedora 43 | 3.1.0-1.fc43 | [FEDORA-2026-1C47E433DF](https://patchblox.com/security/data/fix/linux/fedora-2026-1c47e433df.md) | Feb 16, 2026 | | Linux | python3-apt Fedora 43 | 3.1.0-1.fc43 | [FEDORA-2026-1C47E433DF](https://patchblox.com/security/data/fix/linux/fedora-2026-1c47e433df.md) | Feb 16, 2026 | | Linux | python3-apt Ubuntu 18.04.6 LTS (bionic) | 1.6.6ubuntu0.1~esm1 | [python3-apt 1.6.6ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python3-apt-1.6.6ubuntu0.1-esm1.md) | Dec 4, 2025 | | Linux | python3-apt Ubuntu 20.04 LTS (focal) | 2.0.1ubuntu0.20.04.1+esm1 | [python3-apt 2.0.1ubuntu0.20.04.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-apt-2.0.1ubuntu0.20.04.1-esm1.md) | Dec 4, 2025 | | Linux | python3-apt Ubuntu 22.04.1 LTS (jammy) | 2.4.0ubuntu4.1 | [python3-apt 2.4.0ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-apt-2.4.0ubuntu4.1.md) | Dec 4, 2025 | | Linux | python3-apt Ubuntu 24.04.5 LTS (noble) | 2.7.7ubuntu5.1 | [python3-apt 2.7.7ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-python3-apt-2.7.7ubuntu5.1.md) | Dec 4, 2025 | | Linux | python3-apt Ubuntu 25.10 (questing) | 3.0.0ubuntu1.1 | [python3-apt 3.0.0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-python3-apt-3.0.0ubuntu1.1.md) | Dec 4, 2025 | | Linux | python3-apt-debuginfo Fedora 43 | 3.1.0-1.fc43 | [FEDORA-2026-1C47E433DF](https://patchblox.com/security/data/fix/linux/fedora-2026-1c47e433df.md) | Feb 16, 2026 | --- Data as of 2026-11-08T06:59:42Z UTC. 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