{"id":"CVE-2026-115482","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-115482","generatedAt":"2026-10-28T03:58:51.286Z","title":"In lsquic before 4.9.0, the HTTP/3 implementation can use an excessive amount of memory because the number of buffered header sets is not limited, as demonstrated by a QPACK amplification attack.","description":"In lsquic before 4.9.0, the HTTP/3 implementation can use an excessive amount of memory because the number of buffered header sets is not limited, as demonstrated by a QPACK amplification attack. This is related to header_out_dynamic_entry and es_max_header_list_size.","published":"2026-10-22T16:17:35.000Z","lastModified":"2026-10-22T19:17:48.000Z","status":"Deferred","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-770"],"affected":[],"epss":{"score":0.00446,"percentile":0.38601,"date":"2026-10-27","history":[{"date":"2026-10-23","score":0.00446,"percentile":0.37791}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.45%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-22T16:17:35.000Z","detail":{"score":"7.5","severity":"HIGH","publishedAt":"2026-10-22T16:17:35.490Z"},"summary":"New CVE, high severity (CVSS 7.5)."}],"references":[{"url":"https://foxio.io/blog/header-accordions-qpack-amplification-attacks-against-http-3-servers","source":"cve@mitre.org"},{"url":"https://github.com/litespeedtech/lsquic/compare/v4.8.2...v4.9.0","source":"cve@mitre.org"},{"url":"https://github.com/litespeedtech/lsquic/pull/666","source":"cve@mitre.org"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-115482","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."}