CVE-2026-77100 MediaAgent Denial of Service
A heap-based buffer overflow in Commvault MediaAgent allows attackers to cause a denial of service, requiring an upgrade to the resolved maintenance release.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77100?
CVE-2026-77100 is a high-severity memory corruption vulnerability in Commvault Cloud, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
MediaAgent contained a heap-based buffer overflow issue affecting service availability. Software customers upgrade to resolved maintenance release. Update Commvault installation of MediaAgents and HyperScale.
Weakness: CWE-122
Which versions are affected by CVE-2026-77100?
How do I fix CVE-2026-77100?
No fix has been published for CVE-2026-77100 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-77100 being exploited?
There is no known exploitation of CVE-2026-77100 in the wild and no public exploit code.
Sources
Also known as GHSA-83mj-r2gx-wf57.