CVE-2026-44603 Memory corruption in Tor
An out-of-bounds read in Tor allows attackers to cause denial of service or disclose information via a malformed BEGIN cell.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-44603?
CVE-2026-44603 is a low-severity memory corruption 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 has an out-of-bounds read by one byte via a malformed BEGIN cell, aka TROVE-2026-007.
Weakness: CWE-193
Which versions are affected by CVE-2026-44603?
It affects 1 product.
Products include Torproject Tor.
How do I fix CVE-2026-44603?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-44603 being exploited?
There is no known exploitation of CVE-2026-44603 in the wild and no public exploit code.
Other vulnerabilities in torproject Tor
Sources
Also known as DEBIAN-CVE-2026-44603, GHSA-m47q-4224-6rvc, UBUNTU-CVE-2026-44603.