CVE-2026-9137 CSP Report Endpoint Log Flooding in MISP via Incorrect Size Limit
Attackers can flood MISP logs by sending large CSP reports, causing resource exhaustion and potential service disruption.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-9137?
CVE-2026-9137 is a medium-severity denial of service vulnerability in Misp-Project Misp, published on 20 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-400
Which versions are affected by CVE-2026-9137?
It affects 1 product.
Products include Misp-Project Misp.
How do I fix CVE-2026-9137?
No fix has been published for CVE-2026-9137 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-9137 being exploited?
There is no known exploitation of CVE-2026-9137 in the wild and no public exploit code.
Other vulnerabilities in Misp-Project Misp
Sources
Also known as GHSA-gfvj-j222-m85v.