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Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M

CVE-2026-63452Suricata http1: repeated brotli compression bombs can cause excessive CPU consumption

High 7.5

In plain English

A high-severity uncontrolled resource consumption in suricata from OISF. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.6%top 49.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, the HTTP/1 parser limits decompression work per transaction but does not limit how many small brotli compression bombs a single flow can submit. With response-body-decompress-layer-limit enabled, repeated compressed responses make the decompression paths in rust/htp perform expensive work for every transaction, degrading packet processing and potentially causing loss of monitoring visibility or denial of service. This issue is fixed in version 8.0.6.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13suricatano fix listedDEBIAN-CVE-2026-63452
Debian:14suricata1:8.0.6-1DEBIAN-CVE-2026-63452
Ubuntu:22.04:LTSsuricatano fix listedUBUNTU-CVE-2026-63452
Ubuntu:24.04:LTSsuricatano fix listedUBUNTU-CVE-2026-63452
Ubuntu:26.04:LTSsuricatano fix listedUBUNTU-CVE-2026-63452

Affected products (as reported)

VendorProductVersions
OISF suricata >= 8.0.0, < 8.0.6

Weakness: CWE-400, CWE-409 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References