CVE-2026-77101 PUBLISHED

CommServe Stack-based Buffer Overflow

Assigner: Commvault
Reserved: 20.08.2026 Published: 08.09.2026 Updated: 08.09.2026

CommServe contained a stack-based buffer overflow issue affecting service availability. Software customers upgrade to resolved maintenance release. Update CommServe.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Commvault
Product	Commvault Cloud
Versions	Default: unknown affected from 11.46.0 to 11.46.19 (incl.) affected from 11.44.0 to 11.44.19 (incl.) affected from 11.40.0 to 11.40.71 (incl.) affected from 11.36.0 to 11.36.122 (incl.)

Credits

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

References

https://documentation.commvault.com/securityadvisories/CV_2026_08_3.html

Problem Types

CWE-121: Stack-based Buffer Overflow