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CVE-2026-31933— Suricata stream: quadratic complexity in stream inspection

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 7.0.15之前版本和8.0.4之前版本存在安全漏洞，该漏洞源于特制流量可能导致Suricata在IDS模式下运行变慢，影响性能。

CVSS 7.5 · High EPSS 0.47% · P38

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-31933

Vulnerability Information
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Vulnerability Title
Suricata stream: quadratic complexity in stream inspection
Source: CVE Program / CVE List V5
Vulnerability Description
Suricata is a network IDS, IPS and NSM engine. Prior to versions 7.0.15 and 8.0.4, specially crafted traffic can cause Suricata to slow down, affecting performance in IDS mode. This issue has been patched in versions 7.0.15 and 8.0.4.
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
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 7.0.15之前版本和8.0.4之前版本存在安全漏洞，该漏洞源于特制流量可能导致Suricata在IDS模式下运行变慢，影响性能。
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 < 7.0.15 -

II. Public POCs for CVE-2026-31933

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III. Intelligence Information for CVE-2026-31933

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Vendor Advisories for CVE-2026-31933 (1)

Same Patch Batch · OISF · 2026-04-02 · 6 CVEs total

CVE-2026-31932 7.5 HIGH Suricata krb5: quadratic complexity in krb5 buffering
CVE-2026-31931 7.5 HIGH Suricata tls: null dereference in tls.alpn rule keyword
CVE-2026-31934 7.5 HIGH Suricata smtp/mine: quadratic complexity in extracting urls
CVE-2026-31935 7.5 HIGH Suricata http2: unbounded resource consumption
CVE-2026-31937 7.5 HIGH Suricata dcerpc: quadratic complexity in dcerpc buffering

IV. Related Vulnerabilities

Same product: suricata
Same vendor: OISF
Same weakness: CWE-407

V. Comments for CVE-2026-31933

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