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CVE-2026-96279— Flatpak: flatpak: path traversal issue in oci archive extraction via hardlinks

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
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.

恶意的 OCI 注册表可以在用户从 OCI 远程安装或更新 Flatpak 应用时，将任意的宿主机文件硬链接到解压目录中，从而导致任意宿主机文件内容的泄露。对于以 root 权限运行的系统级安装，这包括敏感文件，例如 /etc/shadow。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1564.008 · Email Hiding Rules
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I. Basic Information for CVE-2026-96279

Vulnerability Information
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Vulnerability Title
Flatpak: flatpak: path traversal issue in oci archive extraction via hardlinks
Source: CVE Program / CVE List V5
Vulnerability Description
A malicious OCI registry can hardlink arbitrary host files into the extraction directory when a user installs or updates a Flatpak application from an OCI remote, allowing disclosure of arbitrary host file contents. For system-wide installs running as root, this includes sensitive files such as /etc/shadow.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-96279

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III. Intelligence Information for CVE-2026-96279

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Other References for CVE-2026-96279 (3)

Same Patch Batch · Red Hat · 2026-09-27 · 6 CVEs total

CVE-2026-96280 7.5 HIGH Flatpak: flatpak: buffer overflow in oci delta stream path names on 32-bit systems
CVE-2026-96281 6.2 MEDIUM Flatpak: flatpak: unprivileged active user can bypass anti-downgrade checks for system app
CVE-2026-96283 3.3 LOW Flatpak: flatpak: flatpak-system-helper cross-user cancelpull orphans another user's ongoi
CVE-2026-96282 3.1 LOW Flatpak: flatpak: extension metadata path traversal file existence oracle
CVE-2026-96284 2.5 LOW Flatpak: flatpak: arbitrary read-access to files in the system-helper context via oci syml

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-59

V. Comments for CVE-2026-96279

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