Heap-Based Buffer Overflow in MediaAgent Affects Commvault Services
CVE-2026-77100

8.7HIGH

Key Information:

Vendor

Commvault

Status
Commvault Cloud
Vendor
CVE Published:
13 October 2026

What is CVE-2026-77100?

The MediaAgent component of Commvault is affected by a heap-based buffer overflow vulnerability that can disrupt service availability. Users are advised to upgrade to the latest maintenance release to mitigate the risk. Ensure your installations of MediaAgents and HyperScale are updated to maintain secure and reliable operations.

Affected Version(s)

Commvault Cloud Windows 11.46.0 <= 11.46.29

Commvault Cloud Windows 11.44.0 <= 11.44.24

Commvault Cloud Windows 11.40.0 <= 11.40.77

References

https://documentation.commvault.com/securityadvisories/CV...

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Michael Tucker and Tan Chew Keong from the XOR team at JPMorgan Chase.
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