CVE Catalog

CVE-2026-115482

HighCVSS 7.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.45%

38th percentile - higher than 38% of all known CVEs

Summary

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 relates to header_out_dynamic_entry and es_max_header_list_size.

Risk Assessment

An attacker can exhaust memory on an HTTP/3 server, causing denial of service or process crashes. This can affect network service availability.

Recommendation

Upgrade lsquic to version 4.9.0 or later. Until then, consider limiting buffered header sets and monitoring memory usage.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS