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CVE-2026-22263— Suricata http1: quadratic complexity in headers parsing over multiple packets

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Open Information Security基金会的一个网络IDS、IPS和NSM引擎。 Suricata 8.0.0至8.0.3之前版本存在安全漏洞，该漏洞源于http1标头解析效率低下，可能导致多数据包处理时性能下降。

CVSS 5.3 · Medium EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-22263

Vulnerability Information
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Vulnerability Title
Suricata http1: quadratic complexity in headers parsing over multiple packets
Source: CVE Program / CVE List V5
Vulnerability Description
Suricata is a network IDS, IPS and NSM engine. Starting in version 8.0.0 and prior to version 8.0.3, inefficiency in http1 headers parsing can lead to slowdown over multiple packets. Version 8.0.3 patches the issue. No known workarounds are available.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
循环内过多的平台资源消耗
Source: CVE Program / CVE List V5
Vulnerability Title
Suricata 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Suricata是Open Information Security基金会的一个网络IDS、IPS和NSM引擎。 Suricata 8.0.0至8.0.3之前版本存在安全漏洞，该漏洞源于http1标头解析效率低下，可能导致多数据包处理时性能下降。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OISF suricata >= 8.0.0, < 8.0.3 -

II. Public POCs for CVE-2026-22263

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III. Intelligence Information for CVE-2026-22263

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Same Patch Batch · OISF · 2026-01-27 · 7 CVEs total

CVE-2026-22258 7.5 HIGH Suricata DCERPC: unbounded fragment buffering leads to memory exhaustion
CVE-2026-22260 7.5 HIGH Suricata http1: infinite recursion in decompression
CVE-2026-22259 7.5 HIGH Suricata dnp3: unbounded transaction growth
CVE-2026-22264 7.4 HIGH Suricata detect/alert: heap-use-after-free on alert queue expansion
CVE-2026-22262 5.9 MEDIUM Suricata datasets: stack overflow when saving a set
CVE-2026-22261 3.7 LOW Suricata eve/alert: http1 xff handling can lead to denial of service

IV. Related Vulnerabilities

Same product: suricata
Same vendor: OISF
Same weakness: CWE-1050

V. Comments for CVE-2026-22263

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