CVE-2026-9137

High

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.

SeverityHigh

CVSS7.5

Exploit probability30. percentile0.4%

ProductMisp

PublishedMay 20, 2026

First seenMay 20, 2026

Weakness typeCWE-400Uncontrolled resource consumption

How to fix

Update

misp-project misp2.5.38 or later

Patches

github.com/MISP/MISP/commit/02932cccab230b295afcaf5aa05e363d30db0ec9

Affected products

Product	Affected versions	Fixed in
misp-project misp	2.5.0 ≤ v < 2.5.38	2.5.38

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