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CVE-2026-92162— Flatpak vulnerable to path traversal via unvalidated "arch" parameter in DeployAppstream

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.

Flatpak 是一个用于在 Linux 上构建、分发和运行沙箱化桌面应用程序的系统。在 1.18.1 版本之前，若系统中配置了至少一个 OCI 远程仓库（在 Fedora 系统上最为常见），处于活动本地会话中的恶意本地用户可通过构造特殊的架构名称，诱使 进程在预期根目录之外创建一个由 root 用户拥有的目录树。该目录树的内容由 OCI 远程仓库决定，并包含一个 root 用户拥有的 文件以及 目录。若此漏洞与 1.18.1 版本中同时修复的其他漏洞结合利用，可能导致本地 root 权限提升。据评估，若系统中未配

CVSS 7.2 · High

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2026-92162

Vulnerability Information
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Vulnerability Title
Flatpak vulnerable to path traversal via unvalidated "arch" parameter in DeployAppstream
Source: CVE Program / CVE List V5
Vulnerability Description
Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. Prior to version 1.18.1, on systems where at least one OCI remote is configured (most common on Fedora systems), a malicious local user in an active local session could use a crafted architecture name to trick the `flatpak-system-helper` process into creating a root-owned directory tree with contents determined by the OCI remote, plus a root-owned `lock` file and `icons` directory, outside the intended root directory. If this vulnerability is combined with other vulnerabilities also fixed in 1.18.1, the combination can lead to local root privilege escalation. This particular vulnerability is not believed to be exploitable if there are no OCI remotes configured (common on non-Fedora systems). Version 1.18.1 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
flatpak flatpak < 1.18.1 -

II. Public POCs for CVE-2026-92162

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III. Intelligence Information for CVE-2026-92162

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Other References for CVE-2026-92162 (5)

IV. Related Vulnerabilities

Same product: flatpak
Same vendor: flatpak
Same weakness: CWE-22

V. Comments for CVE-2026-92162

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