CVE-2026-106428 Out-of-bounds read in SCRAM response parsing in MongoDB C Driver
A malicious server or network intermediary can cause a denial of service in applications using the MongoDB C Driver by triggering an out-of-bounds read during SCRAM authentication.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-106428?
CVE-2026-106428 is a medium-severity memory corruption vulnerability in MongoDB C Driver, published on 8 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An out-of-bounds read in SCRAM authentication response parsing in the MongoDB C Driver can read one byte beyond a fixed-size buffer when processing a malformed server-final message. A server or network intermediary able to provide this message before server-signature verification can cause the application using the driver to terminate. The extra byte is not returned through the protocol.
Weakness: CWE-125
Which versions are affected by CVE-2026-106428?
How do I fix CVE-2026-106428?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-106428 being exploited?
There is no known exploitation of CVE-2026-106428 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-106428, UBUNTU-CVE-2026-106428.