{"id":"CVE-2026-115482","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","summary":"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_ent…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-770"],"vendor":"litespeedtech","product":"lsquic","affected":["lsquic < 4.9.0"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-22T18:34:24.530507Z"},"published":"2026-10-22","updated":"2026-10-22","sourceUpdated":"2026-10-22T19:00:31.416Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115482","references":[{"url":"https://github.com/litespeedtech/lsquic/pull/666"},{"url":"https://github.com/litespeedtech/lsquic/compare/v4.8.2...v4.9.0"},{"url":"https://foxio.io/blog/header-accordions-qpack-amplification-attacks-against-http-3-servers"}],"tags":["cve.org"],"ingestedAt":"2026-10-22T22:00:50.373Z","slug":"CVE-2026-115482","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `lsquic < 4.9.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}