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CVE-2026-31931— Suricata tls: null dereference in tls.alpn rule keyword

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8.0.4之前版本存在代码问题漏洞，该漏洞源于使用tls.alpn规则关键字可能导致Suricata因空指针取消引用而崩溃。

CVSS 7.5 · High EPSS 0.47% · P38

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-31931

Vulnerability Information
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Vulnerability Title
Suricata tls: null dereference in tls.alpn rule keyword
Source: CVE Program / CVE List V5
Vulnerability Description
Suricata is a network IDS, IPS and NSM engine. From version 8.0.0 to before version 8.0.4, use of the "tls.alpn" rule keyword can cause Suricata to crash with a NULL dereference. This issue has been patched in version 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
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Suricata 代码问题漏洞
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8.0.4之前版本存在代码问题漏洞，该漏洞源于使用tls.alpn规则关键字可能导致Suricata因空指针取消引用而崩溃。
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, < 8.0.4 -

II. Public POCs for CVE-2026-31931

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III. Intelligence Information for CVE-2026-31931

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Vendor Advisories for CVE-2026-31931 (1)

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

CVE-2026-31933 7.5 HIGH Suricata stream: quadratic complexity in stream inspection
CVE-2026-31932 7.5 HIGH Suricata krb5: quadratic complexity in krb5 buffering
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-476

V. Comments for CVE-2026-31931

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