Product

Bubblewrap

2 mentions in 7 days · 3 in 30 days · 3 total · first seen Sep 9, 2026 · last 17h ago

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USN-8779-2: Bubblewrap regression

Ubuntu issued USN-8779-2 reverting a Bubblewrap symlink fix for CVE-2026-87766 that caused a regression preventing some Flatpak apps from launching.

USN-8779-2 reverts the CVE-2026-87766 fix from USN-8779-1 because it introduced a regression in symlink resolution that stopped certain Flatpak applications from launching; a complete fix is still pending. The original advisory detailed CVE-2019-12439, where mishandled temporary directories could let a local attacker cause denial of service or execute arbitrary code on Ubuntu 18.04 LTS only, plus improper symlink handling during sandbox setup with similar local impact.

Ubuntu Security Noticesupdated 10:37 UTC · 5h agofirst Sep 17, 22:20 UTC · 17h agoAdvisory 19 sources CVE-2026-87766 CVE-2019-12439

USN-8779-1: Bubblewrap vulnerabilities

Ubuntu fixed two Bubblewrap flaws, CVE-2019-12439 and CVE-2026-87766, enabling local denial of service, code execution, or sandbox-escaped file creation.

USN-8779-1 fixes CVE-2019-12439, incorrect temporary directory handling in Bubblewrap that could allow local denial of service or arbitrary code execution, affecting only Ubuntu 18.04 LTS. It also addresses CVE-2026-87766, incorrect symlink handling during sandbox setup that lets local attackers create files outside the sandbox.

Ubuntu Security Noticesupdated 10:37 UTC · 5h agofirst Sep 17, 15:50 UTC · 1d agoAdvisory 19 sources CVE-2019-12439 CVE-2026-87766

Re: bubblewrap 0.12.0 fixes writes outside sandbox

Red Hat Product Security allocated CVE-2026-87766 for a bubblewrap flaw fixed in 0.12.0 that allowed writes outside the sandbox.

CVE-2026-87766 has been allocated by Red Hat Product Security for the bubblewrap sandboxing tool vulnerability that permitted writes outside the sandbox. The fix shipped in bubblewrap 0.12.0, and the oss-security advisory was updated with the new CVE identifier. The short follow-up post provides no exploitation details.

oss-securitySep 9, 14:33 UTC · 9d agoVulnerability CVE-2026-87766

Related CVEsby mentions

CVE-2026-877668.8<1%
Symlink-following sandbox escape (arbitrary file write) in bubblewrap before 0.12.0
CVE-2026-87766 is a symlink-following flaw (CWE-59) in bubblewrap, the Linux sandboxing tool: during sandbox setup, when bubblewrap creates files or directories under the new root, it can follow a parent symlink through /oldroot onto the host filesystem. The attack is triggered locally (CVSS AV:L/PR:L) before the sandboxed process starts, by an attacker with low privileges who can influence the sandbox setup, for example a sandboxed application being launched or a nested-bwrap scenario, so that writes land at attacker-chosen paths outside the sandbox. The attacker gains the ability to create or overwrite files and directories on the host with the privileges of the user launching the sandbox, breaking the sandbox boundary (CVSS scope-changed, S:C, with high confidentiality, integrity and availability impact; 8.8 High). Any Linux system running bubblewrap versions prior to 0.12.0 is affected, notably desktop distributions where bubblewrap is pulled in as a Flatpak dependency and other tooling that invokes bwrap for sandboxing. No exploitation is currently known: the flaw is not in CISA KEV, no public proof-of-concept is known, and the issue (GHSA-pxhw-h44j-8pfx, assigned by Red Hat) is fixed upstream in bubblewrap 0.12.0.
· bubblewrap project (freedesktop.org) bubblewrap all versions prior to 0.12.0mass
CVE-2019-124397.8<1%
bubblewrap.c in Bubblewrap before 0.3.3 misuses temporary directories in /tmp as a mount point.
bubblewrap.c in Bubblewrap before 0.3.3 misuses temporary directories in /tmp as a mount point. In some particular configurations (related to XDG_RUNTIME_DIR), a local attacker may abuse this flaw to prevent other users from executing bubblewrap or potentially execute code.
· projectatomic bubblewrap—

Appears with

vendor Canonical 2 vendor Ubuntu 2 product Flatpak 1 organization Red Hat Product Security 1 vendor Red Hat 1 product Ubuntu 18.04 LTS 1 organization Ubuntu 1

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