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CVE-2026-34078 is a critical sandbox-escape vulnerability in Flatpak versions prior to 1.16.4. The D-Bus Flatpak portal accepts sandbox-expose option paths that can be application-controlled symbolic links targeting arbitrary host locations. When Flatpak run resolves and mounts the resulting host path into the application sandbox, the sandboxed application can obtain access to arbitrary host files. This host filesystem access can be used as a primitive for code execution in the host user context.
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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.
24 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical remotely exploitable vulnerability addressed by Ubuntu USN-8741-1, affecting Flatpak-related packages on supported Ubuntu LTS releases.
A sandbox escape vulnerability in Flatpak used by Tails' Tor Browser that could allow an attacker who already controls Tor Browser via another vulnerability to break browser confinement and access files not protected by an administration password, including Persistent Storage.
A Flatpak sandbox escape vulnerability that can lead to host file access and code execution in the host context.
A vulnerability in Flatpak prior to 1.16.4 allows sandbox-expose paths to use app-controlled symlinks to arbitrary host paths, enabling access to host files and potentially code execution in the host context.
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.