CVE-2026-9137
CSP Report Endpoint Log Flooding via Incorrect Size Limit
Description
The CSP report endpoint 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.
INFO
Published Date :
May 20, 2026, 6:43 p.m.
Last Modified :
May 20, 2026, 6:43 p.m.
Remotely Exploit :
Yes !
Source :
CIRCL
Affected Products
The following products are affected by CVE-2026-9137
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | MEDIUM | 5a6e4751-2f3f-4070-9419-94fb35b644e8 |
Solution
- Implement strict size enforcement for CSP report logs.
- Truncate logs exceeding the 1 KB limit.
- Restrict access to the CSP report endpoint.
- Monitor log volume for anomalies.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-9137 vulnerability anywhere in the article.