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CVE-2026-22261— Suricata eve/alert: http1 xff handling can lead to denial of service

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 8.0.3之前版本和7.0.14之前版本存在安全漏洞，该漏洞源于xff处理存在低效问题，可能导致严重性能下降。

CVSS 3.7 · Low EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-22261

Vulnerability Information
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Vulnerability Title
Suricata eve/alert: http1 xff handling can lead to denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
Suricata is a network IDS, IPS and NSM engine. Prior to versions 8.0.3 and 7.0.14, various inefficiencies in xff handling, especially for alerts not triggered in a tx, can lead to severe slowdowns. Versions 8.0.3 and 7.0.14 contain a patch. As a workaround, disable XFF support in the eve configuration. The setting is disabled by default.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/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 8.0.3之前版本和7.0.14之前版本存在安全漏洞，该漏洞源于xff处理存在低效问题，可能导致严重性能下降。
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 < 7.0.14 -

II. Public POCs for CVE-2026-22261

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III. Intelligence Information for CVE-2026-22261

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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-2026-22263 5.3 MEDIUM Suricata http1: quadratic complexity in headers parsing over multiple packets

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-22261

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