CVE-2026-93996 Apache MINA SSHD: Memory exhaustion DoS via unbounded SCP command line read
A malicious peer can cause memory exhaustion and application crash in Apache MINA SSHD by sending an unbounded SCP command line without a line terminator.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93996?
CVE-2026-93996 is a medium-severity denial of service vulnerability in Apache MINA SSHD, published on 30 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Uncontrolled resource consumption in component ssd-scp in Apache MINA SSHD versions up to 2.19.0 or 3.0.0-M1 to 3.0.0-M5. Apache MINA SSHD is a Java library for client-side and server-side SSH.
Component sshd-scp of Apache MINA SSHD provides a Java implementation of SCP. The SCP command protocol is line-oriented with LF-terminated lines. The protocol handler in sshd-scp did not impose any limit on the length of such protocol lines. A malicious peer just sending a junk command containing a never-ending sequence of characters but never a LF would cause the receiver to allocate memory to store this whole junk command, exhausting memory and crashing the application with an OutOfMemoryError.
Users are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue by enforcing an upper limit on the length of SCP protocol lines.
Weakness: CWE-770
Which versions are affected by CVE-2026-93996?
How do I fix CVE-2026-93996?
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-2026-93996 being exploited?
There is no known exploitation of CVE-2026-93996 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93996, GHSA-6wm4-w8x6-4vvr, UBUNTU-CVE-2026-93996.