CVE-2026-115482

CVSS 7.5 (high) · published 2026-10-22

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.

Weakness: CWE-770

Source: NVD CVE-2026-115482

References

• https://foxio.io/blog/header-accordions-qpack-amplification-attacks-against-http-3-servers
• https://github.com/litespeedtech/lsquic/compare/v4.8.2...v4.9.0
• https://github.com/litespeedtech/lsquic/pull/666

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