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CVE-2026-71418— Suricata doh2: crafted HTTP/2 DATA frames can cause quadratic 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。在 8.0.0 到 8.0.6 版本中，DNS-over-HTTP/2 的处理逻辑（位于 ）未能在处理后清除内部缓冲区，而是保留了之前已处理的 HTTP/2 DATA 帧内容。攻击者可以发送多个带有 EndOfStream 标志的 DATA 帧，使缓冲区增长至 65 KiB 上限，同时导致先前处理的内容被重复处理，从而引发二次方级别的 CPU 复杂度增长，造成数据包处理性能下降、监控可见性丧失，甚至拒绝服务（DoS）风险

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-71418

Vulnerability Information
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Vulnerability Title
Suricata doh2: crafted HTTP/2 DATA frames can cause quadratic 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, DNS-over-HTTP/2 processing in rust/src/http2/http2.rs retains previously processed HTTP/2 DATA frame contents instead of clearing the internal buffer. Multiple DATA frames with the EndOfStream flag set can grow the buffer to its 65 KiB limit while causing all prior contents to be processed again, producing quadratic CPU complexity, degraded packet processing, 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
算法复杂性
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-2026-71418

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III. Intelligence Information for CVE-2026-71418

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Patches & Fixes for CVE-2026-71418 (2)

Other References for CVE-2026-71418 (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-2026-63452 7.5 HIGH Suricata http1: repeated brotli compression bombs can cause excessive CPU consumption
CVE-2026-57227 7.5 HIGH Suricata mqtt: unbounded resource consumption from repeated pubrec and pubrel messages
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-407

V. Comments for CVE-2026-71418

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