CVE-2026-96807
In Flatpak before 1.18.1, a malicious sandboxed app can replace ~/.var/app/$appid/.ld.so with a symlink, causing regenerate_ld_cache to write files at an arbitrary location. The filenames and content
02 Description
In Flatpak before 1.18.1, a malicious sandboxed app can replace ~/.var/app/$appid/.ld.so with a symlink, causing regenerate_ld_cache to write files at an arbitrary location. The filenames and content
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.11% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 1.7% of scored records. A rank, not a probability.
- NVD base score
- 4.0 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
- NVD analysis status
- Awaiting Analysis. NVD last modified this record on 2026-09-26.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-09-23 16:54Z1 MO AGO
- Last updated
- 2026-09-26 22:51Z1 MO AGO
- Reserved
- 2026-09-23
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 4.0)
- CNA CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
- Weaknesses
- Data version
- 5.2
- Document digest
- a9bf307d274815b037d9704d0248901a6cb46d849cb98ef9f72d146df2b061c8
05 Affected products
06 References
07 Remediation
The issue has been fixed in version 1.18.1 by commits: * e13dfed https://github.com/flatpak/flatpak/commit/e13dfeda330625d2fecc3a54672dfd4dc9c83a5c "common: Fix return value and typos in flatpak_switch_symlink_and_remove" * f6c8fb5 https://github.com/flatpak/flatpak/commit/f6c8fb5fdb3737e2f45068afe12c4bf1d808fd55 "common: Use fd-based operations in flatpak_switch_symlink_and_remove" * 76c9296 https://github.com/flatpak/flatpak/commit/76c9296b6780ca67f44cf67f0823f086d692a592 "run: Harden regenerate_ld_cache against symlink attacks" For LTS operating system distributions, backports of these changes are available in the flatpak-1.16.x branch. Please note that cherry-picked libglnx changes "chase: Add internal glnx_chaseat_full for a strategic callback" and "chase: Add glnx_chase_and_mkdirat" are also required.
08 Fixed in
Debian 12
- flatpak No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- flatpak Fixed in 1.16.6-1~deb13u2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- flatpak Fixed in 1.18.1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- flatpak No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- flatpak No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- flatpak No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 22.04 LTS
- flatpak No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 24.04 LTS
- flatpak No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.