CVE-2026-77100: CWE-122: Heap-based Buffer Overflow in Commvault Commvault Cloud
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.
CVSS v4.0
Score 8.7high
Affected software
Commvault
Commvault Cloud
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-77100) involves a heap-based buffer overflow in the MediaAgent component of Commvault Cloud, which can lead to service availability issues. The flaw affects multiple version ranges of Commvault Cloud MediaAgent and HyperScale. The CVSS 4.0 score is 8.7, indicating a high severity with network attack vector, no privileges or user interaction required, and high impact on availability. Customers are advised to upgrade to the resolved maintenance releases to address this issue.
Potential Impact
Successful exploitation of this heap-based buffer overflow can disrupt service availability of the affected Commvault Cloud MediaAgent and HyperScale components. There is no indication of confidentiality or integrity impact, nor evidence of active exploitation in the wild.
Mitigation Recommendations
Customers should upgrade their Commvault Cloud MediaAgent and HyperScale installations to the resolved maintenance releases that fix this vulnerability. Since the vendor advisory indicates upgrading to a resolved maintenance release, this is the official fix. No additional mitigation steps are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Commvault
- Date Reserved
- 2026-08-20T10:57:52.110Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ace415e2cdf04f656747dbd
Added to database: 10/13/2026, 14:34:06 UTC
Last enriched: 10/13/2026, 14:48:26 UTC
Last updated: 10/13/2026, 18:57:33 UTC
Views: 11
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