Heap-based buffer overflow in Commvault - CVE-2026-77100
Published: October 15, 2026
Vulnerability identifier: #VU155957
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-77100
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a heap-based buffer overflow in Commvault Media Agent when processing network input. A remote attacker can send specially crafted input to trigger memory corruption and disrupt service availability.
Affected software
Commvault
How to mitigate CVE-2026-77100
Install security update from vendor's website.
Commvault - addressed in versions 11.36.127, 11.40.78, 11.44.25, 11.46.30