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

Quick assessment

Affected
OISF suricata
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Suricata 是一款网络入侵检测系统（IDS）、入侵防御系统（IPS）以及网络安全监控引擎。从版本 8.0.0 到 8.0.6，其 HTTP/1 解析器虽然对每次事务的解压工作量进行了限制，但并未限制单个数据流中可提交的小规模 Brotli 压缩炸弹的数量。当启用 选项时，反复接收压缩响应会导致 模块中的解压路径在每次事务中都执行高成本操作，从而降低数据包处理性能，并可能导致监控可见性丢失或拒绝服务（DoS）攻击。该问题已在版本 8.0.6 中修复。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-63452

Vulnerability Information
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Vulnerability Title
Suricata http1: repeated brotli compression bombs can cause excessive CPU consumption
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OISF suricata >= 8.0.0, < 8.0.6 -

II. Public POCs for CVE-2026-63452

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III. Intelligence Information for CVE-2026-63452

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Patches & Fixes for CVE-2026-63452 (2)

Other References for CVE-2026-63452 (3)

Same Patch Batch · OISF · 2026-09-18 · 17 CVEs total

CVE-2026-57228 8.2 HIGH Suricata smtp/mime: heap out-of-bounds read quoted-printable decoder
CVE-2026-63446 7.5 HIGH Suricata app-layer: passed flows can retain transactions, causing resource exhaustion
CVE-2026-63447 7.5 HIGH Suricata ftp: crafted FTP traffic can cause quadratic CPU consumption
CVE-2026-57227 7.5 HIGH Suricata mqtt: unbounded resource consumption from repeated pubrec and pubrel messages
CVE-2026-71418 7.5 HIGH Suricata doh2: crafted HTTP/2 DATA frames can cause quadratic CPU consumption
CVE-2026-57223 7.0 HIGH Suricata windows: unquoted LocalSystem service ImagePath can allow local privilege escalat
CVE-2026-57224 6.5 MEDIUM Suricata dhcp: unbounded transactions in unidirectional traffic can lead to resource exhau
CVE-2026-63448 5.9 MEDIUM Suricata smb: some SMB flows can cause resource exhaustion
CVE-2026-71855 5.9 MEDIUM Suricata flow: IPv4/IPv6 hash collision can reuse wrong flow state
CVE-2026-57229 5.3 MEDIUM Suricata smtp/mime: incomplete state reset allows detection bypass
CVE-2026-57222 5.3 MEDIUM Suricata ippair: hash collision can cause incorrect state reuse across IPv4 and IPv6
CVE-2026-63450 3.7 LOW Suricata ftp: RETR/STOR before PORT/PASV can disable further IDS app-layer detection
CVE-2026-63449 3.7 LOW Suricata sip: large SIP message bodies can evade detection with frame keyword
CVE-2026-57226 3.7 LOW Suricata swf: heap buffer overflow in SWF decompression depth handling
CVE-2026-63451 3.3 LOW Suricata detect: frame rules without content and with transform can cause heap buffer over
CVE-2026-57225 3.3 LOW Suricata datasets: NULL pointer dereference in JSON/NDJSON dataset loading

IV. Related Vulnerabilities

Same product: suricata
Same vendor: OISF
Same weakness: CWE-400

V. Comments for CVE-2026-63452

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