Vulnerability · Published Sep 23, 2026 · Assigned by mitre
CVE-2026-96807
Medium 4.0
In plain English
A medium-severity security flaw in Flatpak from Flatpak. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.0Medium
Exploit odds (30 days)0.1%top 98.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 are not attacker controlled, making this hard to exploit.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | flatpak | no fix listed | DEBIAN-CVE-2026-96807 |
| Debian:13 | flatpak | 1.16.6-1~deb13u2 | DEBIAN-CVE-2026-96807 |
| Debian:14 | flatpak | 1.18.1-1 | DEBIAN-CVE-2026-96807 |
| Ubuntu:26.04:LTS | flatpak | no fix listed | UBUNTU-CVE-2026-96807 |
Affected products (as reported)
Weakness: CWE-61 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L