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Flatpak before 1.18.1 improperly follows symbolic links while creating and bind-mounting application data directories whose path components can be controlled by a sandboxed application. The bind-mount operation passes these paths to the kernel without sufficient symlink protection, allowing a malicious application to redirect a mount to an arbitrary host filesystem location. This exposes the selected host location within the application sandbox and breaks filesystem isolation.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Flatpak sandbox-escape vulnerability in which a symlink attack on application data directories can provide full read/write access to the host filesystem.
An unpatched vulnerability identified as CVE-2026-90616 affecting Debian Linux 12.0. The provided CVSS v3 vector indicates high confidentiality, integrity, and availability impact, local attack vector, high attack complexity, and no privileges or user interaction required.
A symlink-handling vulnerability in Flatpak prior to 1.18.1. A malicious sandboxed application can redirect attacker-controlled path components used in bind mounts, gaining arbitrary host-file read/write access and potentially arbitrary code execution on the host.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.