CVE-2026-115482

Unbounded Header Buffers in LiteSpeed HTTP/3 Allow Memory Exhaustion via QPACK Amplification

Published Oct 22, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Unbounded Header Buffers in LiteSpeed HTTP/3 Allow Memory Exhaustion via QPACK Amplification
Type Values Removed Values Added
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.
First Time appeared Litespeedtech
Litespeedtech lsquic
Weaknesses CWE-770
CPEs cpe:2.3:a:litespeedtech:lsquic:*:*:*:*:*:*:*:*
Vendors & Products Litespeedtech
Litespeedtech lsquic
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Oct 22, 2026, 7:00 PM
Reserved
Oct 22, 2026, 3:07 PM
Status
Deferred
Published
Oct 22, 2026, 4:17 PM
Modified
Oct 22, 2026, 7:17 PM