CVE-2026-115482

EUVD-2026-108211
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mitreCNA
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 37.79%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
litespeedtechlsquic
𝑥
< 4.9.0
CNA
Common Weakness Enumeration
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