CVE-2026-44600 Denial of service in Tor

Low 3.7 Published 7 May 2026 Updated 7 May 2026

Attackers can cause a denial of service in Tor by exploiting improper handling of the conflux out-of-order queue during clearing operations.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-44600?

CVE-2026-44600 is a low-severity denial of service vulnerability in torproject Tor, published on 7 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Tor before 0.4.9.7 mishandles accounting of the conflux out-of-order queue during the clearing of a queue, aka TROVE-2026-010.

Weakness: CWE-696

Which versions are affected by CVE-2026-44600?

It affects 1 product.

Products include Torproject Tor.

How do I fix CVE-2026-44600?

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-2026-44600 being exploited?

There is no known exploitation of CVE-2026-44600 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2026-44600, GHSA-7cv5-2ch3-g323, UBUNTU-CVE-2026-44600.