| Name | CVE-2026-96276 |
| Description | If a malicious SDK container declares an extension point with a crafted `directory` path, and a developer runs `flatpak build-init --writable-sdk --sdk-extension` with that SDK, attacker-chosen files could be written outside the working directory, since the target path is resolved via a function that allows `..` traversal. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6432-1 |
| Debian Bugs | 1144130 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| flatpak (PTS) | bookworm, bookworm (security) | 1.14.10-1~deb12u2 | vulnerable |
| trixie | 1.16.6-1~deb13u2 | fixed | |
| trixie (security) | 1.16.6-1~deb13u3 | fixed | |
| forky, sid | 1.18.4-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| flatpak | source | trixie | 1.16.6-1~deb13u2 | DSA-6432-1 | ||
| flatpak | source | (unstable) | 1.18.1-1 | 1144130 |
https://github.com/flatpak/flatpak/security/advisories/GHSA-8qxj-x646-phcm
Fixed by: https://github.com/flatpak/flatpak/commit/c42326c74d63e550d874312be0c7a800cf5fc39f (1.18.1)
Fixed by: https://github.com/flatpak/flatpak/commit/12a30ecb422b1e1246cb2d9af60c14ef7b8f22a4 (1.18.1)
Fixed by: https://github.com/flatpak/flatpak/commit/71f28c42ffff7bfd132fbee1ebc50ab0d08de2d3 (1.18.1)
Fixed by: https://github.com/flatpak/flatpak/commit/fb8ae524738e0a0097a6d64bfcda71552174b7fb (branch flatpak-1.16.x)
Fixed by: https://github.com/flatpak/flatpak/commit/c0a109aa4f861f557aed60c42d0ee64d2c3a943c (branch flatpak-1.16.x)
Fixed by: https://github.com/flatpak/flatpak/commit/619e75e7e453697b3f1d50d84e116e4df3d15df6 (branch flatpak-1.16.x)
Additional requirement: https://github.com/flatpak/flatpak/commit/3d43a0f5fa602cc3edc557d8ab835030140792b1 (branch flatpak-1.16.x)
Additional requirement: https://github.com/flatpak/flatpak/commit/68c12b9695eee4a94d896f0cf2f388f0d3c63df1 (branch flatpak-1.16.x)