Stack-Based Buffer Overflow Vulnerability in CommServe by Commvault
CVE-2026-77101

8.7HIGH

Key Information:

Vendor

Commvault

Status
Commvault Cloud
Vendor
CVE Published:
8 September 2026

What is CVE-2026-77101?

CommServe by Commvault has been identified with a stack-based buffer overflow vulnerability that could potentially disrupt service availability. Users are strongly encouraged to upgrade to the latest maintenance release to mitigate the risk and ensure stable operation of the software.

Affected Version(s)

Commvault Cloud Windows 11.46.0 <= 11.46.19

Commvault Cloud Windows 11.44.0 <= 11.44.19

Commvault Cloud Windows 11.40.0 <= 11.40.71

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.
.