CVE-2026-6994 Envoy Query Parameter header_mutation.cc params.add injection
Remote attackers can inject code via query parameters in Envoy's header mutation filter, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6994?
CVE-2026-6994 is a medium-severity code injection vulnerability in Envoy, published on 25 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A weakness has been identified in Envoy up to 1.33.0. Affected is the function params.add of the file source/extensions/filters/http/header_mutation/header_mutation.cc of the component Query Parameter Handler. This manipulation causes injection. Remote exploitation of the attack is possible. Patch name: f8f4f1e02fdc64ecd4acf2d903208dd7285ad3a4. It is suggested to install a patch to address this issue.
Which versions are affected by CVE-2026-6994?
How do I fix CVE-2026-6994?
No fix has been published for CVE-2026-6994 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-6994 being exploited?
There is no known exploitation of CVE-2026-6994 in the wild and no public exploit code.
Sources
Also known as GHSA-42r9-gr9r-q5q5.