CVE-2026-115482 Details
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.
A memory exhaustion vulnerability has been identified in LiteSpeed Technologies lsquic versions prior to 4.9.0. The issue arises in the HTTP/3 implementation, where the number of buffered header sets is not capped, leading to excessive memory usage. This vulnerability can be exploited through a QPACK amplification attack, where an attacker sends a small amount of data that is expanded into a much larger size, overwhelming the server's memory capacity.
Users can upgrade to LiteSpeed Technologies lsquic version 4.9.0 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 22, 2026CISA-ADP
Assessed Oct 22, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://foxio.io/blog/header-accordions-qpack-amplification-attacks-against-http-3-servers | [email protected] | Technical Analysis |
| https://github.com/litespeedtech/lsquic/compare/v4.8.2...v4.9.0 | [email protected] | Release NotesVendor |
| https://github.com/litespeedtech/lsquic/pull/666 | [email protected] | Issue TrackingVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| lsquic | < 4.9.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 22, 2026 | CVE Modified | CISA-ADP |
| Oct 22, 2026 | New CVE Received | [email protected] |