CVE-2026-116372 MISP mispguard: Feed responses with 2xx status codes other than 200 bypass filtering rules
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-116372?
CVE-2026-116372 is a high-severity vulnerability in misp-guard, published on 26 Oct 2026.
Official description
MISP mispguard is a security filtering proxy that inspects and blocks MISP feed responses based on configured rules. The process_feed_response method in src/mispguard.py was responsible for evaluating feed responses before they reached the MISP instance. The original logic only explicitly handled the case where the HTTP status code was not 200 by passing the response through without filtering, on the assumption that non-200 responses would not carry ingestible event data. However, HTTP 2xx status codes other than 200 (such as 201 Created, 203 Non-Authoritative Information, and 206 Partial Content) were also passed through unfiltered. Because MISP may still ingest content from these responses, a malicious or compromised feed host could return a 203 or 206 status code with arbitrary content, effectively bypassing all of mispguard's filtering rules. This allowed unfiltered or malicious feed data to be ingested into the MISP instance, undermining the security controls that mispguard is designed to enforce. The vulnerability requires the attacker to control or compromise a feed endpoint configured in the MISP instance. No authentication or user interaction is required beyond the feed polling mechanism already in place.
Weakness: CWE-20
Which versions are affected by CVE-2026-116372?
How do I fix CVE-2026-116372?
No fix has been published for CVE-2026-116372 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-116372 being exploited?
There is no known exploitation of CVE-2026-116372 in the wild and no public exploit code.
Sources
Also known as GHSA-85gw-r975-r63j.