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CVE-2026-90616

Quick assessment

Affected
Flatpak Flatpak
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Flatpak 1.18.1 之前的版本中，恶意的沙箱应用可以获得对宿主机的任意文件读/写权限，该权限可进一步升级为在宿主机上的任意代码执行。这是一个独立于 CVE-2026-76925 的漏洞。 每当启动应用时，Flatpak 会在每个沙箱中创建若干应用数据目录（例如 /var/cache、/var/data、/var/config 和 /var/tmp），其中在某些情况下，路径中的某些组件由攻击者控制。由于缺少符号链接保护，这些目录的指向可能被重定向。 其中部分目录由 Flatpak 通过传入路径（例如 /

CVSS 7.4 · High
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I. Basic Information for CVE-2026-90616

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In Flatpak before 1.18.1, a malicious sandboxed app can obtain arbitrary read and write access to files on the host, which can be escalated to arbitrary code execution on the host, a different vulnerability than CVE-2026-76925. Flatpak creates a few app data directories (e.g., /var/cache, /var/data, /var/config, and /var/tmp) in every sandbox on every app launch where, in some cases, components of the path are attacker-controlled. Missing symlink protection can redirect the directories. Some of these directories are bind-mounted by Flatpak by passing the path (e.g., /home/user/.var/app/APP_ID/cache/tmp), which contains attacker-controlled directories (tmp) to bwrap --bind SRC DST. bwrap passes the path on to the kernel, which then follows symlinks. A malicious symlink can point to arbitrary locations on the host and it will become mounted inside the sandbox.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Flatpak Flatpak 0 ~ 1.18.1 -

II. Public POCs for CVE-2026-90616

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III. Intelligence Information for CVE-2026-90616

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Vendor Advisories for CVE-2026-90616 (1)

Mailing List Discussions for CVE-2026-90616 (1)

IV. Related Vulnerabilities

Same product: Flatpak
Same vendor: Flatpak
Same weakness: CWE-61

V. Comments for CVE-2026-90616

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