CVE-2026-43506 Denial of service in Prosody
Unauthenticated attackers can cause a Denial of Service in Prosody XMPP server by exhausting memory through connection leaks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43506?
CVE-2026-43506 is a medium-severity denial of service vulnerability in Prosody, published on 1 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in Prosody before 0.12.6 and 1.0.0 through 13.0.0 before 13.0.5. A Denial of Service can occur via memory exhaustion caused by memory leaks from unauthenticated connections.
Weakness: CWE-401
Which versions are affected by CVE-2026-43506?
It affects 1 product.
Products include Prosody Prosody.
How do I fix CVE-2026-43506?
Upgrade to a fixed version.
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-2026-43506 being exploited?
There is no known exploitation of CVE-2026-43506 in the wild and no public exploit code.
Other vulnerabilities in Prosody
Sources
Also known as DEBIAN-CVE-2026-43506, GHSA-q553-9xvw-ww8h, UBUNTU-CVE-2026-43506.