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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "lsquic", "vendor": "litespeedtech", "versions": [{"lessThan": "4.9.0", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "cve@mitre.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-115482", "lastModified": "2026-10-22T17:40:46.877", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-10-22T16:17:35.490", "references": [{"source": "cve@mitre.org", "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"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "cve@mitre.org", "type": "Primary"}]}

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{"created": "2026-10-22T16:30:08.803137+00:00", "title": "Unbounded Header Buffers in LiteSpeed HTTP/3 Allow Memory Exhaustion via QPACK Amplification", "updated": "2026-10-22T16:30:08.803143+00:00", "vendors": []}