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: 2026-10-22
Score: 7.5 High
EPSS: n/a
KEV: No
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Thu, 22 Oct 2026 16:45:00 +0000

Type Values Removed Values Added
Title Unbounded Header Buffers in LiteSpeed HTTP/3 Allow Memory Exhaustion via QPACK Amplification

Thu, 22 Oct 2026 15:30:00 +0000

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'}

Subscriptions

Litespeedtech Lsquic
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-10-22T15:07:30.961Z

Reserved: 2026-10-22T15:07:30.097Z

Link: CVE-2026-115482

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-22T16:17:35.490

Modified: 2026-10-22T16:17:35.490

Link: CVE-2026-115482

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-22T16:30:08Z

Weaknesses
  • CWE-770

    Allocation of Resources Without Limits or Throttling