CVE-2025-13826 Incorrect input validation on the Zervit portable HTTP/Web server
Remote attackers can cause a denial of service in Zervit's portable HTTP server by sending malicious configuration reset requests due to poor input validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-13826?
CVE-2025-13826 is a high-severity denial of service vulnerability in Zervit portable HTTP/Web server, published on 21 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Zervit's portable HTTP/web server is vulnerable to remote DoS attacks when a configuration reset request is made. The vulnerability is caused by inadequate validation of user-supplied input. An attacker can exploit this vulnerability by sending malicious requests. If the vulnerability is successfully exploited, the application can be made to stop responding, resulting in a DoS condition. It is possible to manually restart the application.
Weakness: CWE-20
Which versions are affected by CVE-2025-13826?
How do I fix CVE-2025-13826?
No fix has been published for CVE-2025-13826 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-2025-13826 being exploited?
There is no known exploitation of CVE-2025-13826 in the wild and no public exploit code.
Sources
Also known as GHSA-mwv3-mcxm-vh5m.