{"id":"CVE-2025-5991","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-5991","generatedAt":"2026-10-28T02:22:56.043Z","title":"There is a \"Use After Free\" vulnerability in Qt's QHttp2ProtocolHandler in the QtNetwork module.","description":"There is a \"Use After Free\" vulnerability in Qt's QHttp2ProtocolHandler in the QtNetwork module. This only affects HTTP/2 handling, HTTP handling is not affected by this at all. This happens due to a race condition between how QHttp2Stream uploads the body of a\n POST request and the simultaneous handling of HTTP error responses.\n\n\n\nThis issue only affects Qt 6.9.0 and has been fixed for Qt 6.9.1.","published":"2025-06-11T08:15:23.000Z","lastModified":"2026-07-29T10:16:37.000Z","status":"Deferred","sourceIdentifier":"a59d8014-47c4-4630-ab43-e1b13cbe58e3","cvss":{"version":"4.0","score":2.1,"severity":"LOW","vector":"CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-416"],"affected":[],"epss":{"score":0.00136,"percentile":0.02999,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.14%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://codereview.qt-project.org/c/qt/qtbase/+/643777","source":"a59d8014-47c4-4630-ab43-e1b13cbe58e3"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-5991","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}