{"schemaVersion":3,"id":"USN-8779-2","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"bubblewrap regression\n\nUSN-8779-1 fixed vulnerabilities in Bubblewrap. Unfortunately, the fix for\nCVE-2026-87766 introduced a regression in symlink resolution, preventing\ncertain Flatpak applications from launching. This update reverts that fix\nuntil a complete fix is available.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n It was discovered that Bubblewrap incorrectly handled certain temporary\n directories. A local attacker could possibly use this issue to cause a\n denial of service or execute arbitrary code. This issue only affected\n Ubuntu 18.04 LTS. (CVE-2019-12439)\n\n It was discovered that Bubblewrap incorrectly handled certain symlinks\n during sandbox setup. A local attacker could possibly use this issue to\n create files outside of the sandbox. (CVE-2026-87766)","dates":{"published":"2026-09-17T22:20:14.000Z","modified":"2026-09-18T06:00:03.088Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"ubuntu","product":"bubblewrap","name":"bubblewrap","label":"bubblewrap","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/bubblewrap","purlType":"deb","versions":[{"text":"< 0.2.1-1ubuntu0.1+esm3","noFixRecorded":false,"fixedIn":null},{"text":"< 0.4.0-1ubuntu4.1+esm3","noFixRecorded":false,"fixedIn":null},{"text":"< 0.6.1-1ubuntu0.3","noFixRecorded":false,"fixedIn":null},{"text":"< 0.9.0-1ubuntu0.3","noFixRecorded":false,"fixedIn":null},{"text":"< 0.11.1-1ubuntu0.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.2.1-1ubuntu0.1+esm3 | < 0.4.0-1ubuntu4.1+esm3 | < 0.6.1-1ubuntu0.3 | < 0.9.0-1ubuntu0.3 | < 0.11.1-1ubuntu0.3","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-8779-2","label":"ubuntu.com/security/notices/USN-8779-2","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://bugs.launchpad.net/ubuntu/+source/bubblewrap/+bug/2167621","label":"bugs.launchpad.net/ubuntu/+source/bubblewrap/+bug/2167621","hostname":"bugs.launchpad.net","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-17T22:20:14.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-18T06:00:03.088Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T22:44:47.419Z","stale":false,"partial":false}}