CVE-2026-9137

CSP Report Endpoint Log Flooding in MISP via Incorrect Size Limit

State: Published
Severity: 5.1 Medium
Published: May 20, 2026
Updated: May 29, 2026
Reserved: May 20, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	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	CIRCL

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
mispmisp	2.5.0 through 2.5.37Affected

References

https://github.com/MISP/MISP/commit/02932cccab230b295afcaf5aa05e363d30db0ec9patch

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