CVE-2026-22261— Suricata eve/alert: http1 xff handling can lead to 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
循环内过多的平台资源消耗
Source: NVD (National Vulnerability Database)
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
II. Public POCs 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
- CVE-2026-31937
Suricata dcerpc: quadratic complexity in dcerpc buffering - CVE-2026-31935
Suricata http2: unbounded resource consumption - CVE-2026-31934
Suricata smtp/mine: quadratic complexity in extracting urls - CVE-2026-31933
Suricata stream: quadratic complexity in stream inspection - CVE-2026-31932
Suricata krb5: quadratic complexity in krb5 buffering
Same vendor: OISF
- CVE-2026-31937
Suricata dcerpc: quadratic complexity in dcerpc buffering - CVE-2026-31935
Suricata http2: unbounded resource consumption - CVE-2026-31934
Suricata smtp/mine: quadratic complexity in extracting urls - CVE-2026-31933
Suricata stream: quadratic complexity in stream inspection - CVE-2026-31932
Suricata krb5: quadratic complexity in krb5 buffering
Same weakness: CWE-1050
- CVE-2026-4634
Keycloak: keycloak: denial of service via excessive processi - CVE-2026-22263
Suricata http1: quadratic complexity in headers parsing over - CVE-2025-48866
ModSecurity has possible DoS vulnerability in sanitiseArg ac - CVE-2025-47947
ModSecurity Has Possible DoS Vulnerability - CVE-2025-32907
Libsoup: denial of service in server when client requests a
V. Comments for CVE-2026-22261
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