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CVE-2026-9137— CSP Report Endpoint Log Flooding in MISP via Incorrect Size Limit

Quick assessment

Affected
misp misp
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.

MISP是MISP开源的一套开源的软件解决方案。该产品用于收集、存储、分发、共享网络安全指标，并具有威胁网络安全事件分析和恶意软件分析等功能。 MISP存在资源管理错误漏洞，该漏洞源于限制日志报告为1KB但错误允许报告达到1MB后才截断，可能导致攻击者生成过多日志量并造成资源耗尽或日志淹没。

AI Predicted 5.3 Difficulty: Easy EPSS 0.46% · P37

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
misp misp 2.5.0≤ 2.5.37 affected
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I. Basic Information for CVE-2026-9137

Vulnerability Information
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Vulnerability Title
CSP Report Endpoint Log Flooding in MISP via Incorrect Size Limit
Source: CVE Program / CVE List V5
Vulnerability Description
The CSP report endpoint in MISP intended to limit logged CSP reports to 1 KB but incorrectly allowed reports up to 1 MB before truncation. On deployments where the endpoint is reachable by untrusted clients, this could allow attackers to generate excessive log volume and contribute to resource exhaustion or log flooding.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
MISP 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MISP是MISP开源的一套开源的软件解决方案。该产品用于收集、存储、分发、共享网络安全指标，并具有威胁网络安全事件分析和恶意软件分析等功能。 MISP存在资源管理错误漏洞，该漏洞源于限制日志报告为1KB但错误允许报告达到1MB后才截断，可能导致攻击者生成过多日志量并造成资源耗尽或日志淹没。
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
misp misp 2.5.0 ~ 2.5.37 -

II. Public POCs for CVE-2026-9137

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III. Intelligence Information for CVE-2026-9137

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Patches & Fixes for CVE-2026-9137 (1)

Same Patch Batch · misp · 2026-05-20 · 3 CVEs total

CVE-2026-9084 MISP OIDC authentication bypass via automatic email-based account linking under insecure I
CVE-2026-9136 Unauthorized ShadowAttribute modification in MISP via client-supplied identifier

IV. Related Vulnerabilities

Same product: misp
Same vendor: misp
Same weakness: CWE-400

V. Comments for CVE-2026-9137

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