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Ubuntu Security NoticesUSN-8779-2

USN-8779-2: Bubblewrap regression

USN-8779-1 fixed vulnerabilities in Bubblewrap. Unfortunately, the fix for CVE-2026-87766 introduced a regression in symlink resolution, preventing certain Flatpak applications from launching. This update reverts that fix until a complete fix is available. We apologize for the inconvenience. Original advisory details: It was discovered that Bubblewrap incorrectly handled certain temporary directories. A local attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-12439) It was discovered that Bubblewrap incorrectly handled certain symlinks during sandbox setup. A local attacker could possibly use this issue to create files outside of the sandbox. (CVE-2026-87766)

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What the vendor recommends

USN-8779-1 fixed vulnerabilities in Bubblewrap.

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  1. Published by Ubuntu

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Vulnerabilities

CVEs named in this advisory

CVE-2026-87766View CVSS, KEV, EPSS, and threat contextCVE-2019-12439View CVSS, KEV, EPSS, and threat context
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