Is CVE-2026-77100 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-77100 being exploited in the wild.

How severe is CVE-2026-77100?

Informational severity, published 13 October 2026.

Which products and versions are affected?

Commvault HyperScale 11.46.0-11.46.29, 11.44.0-11.44.24, 11.40.0-11.40.77, 11.36.0-11.36.126; Commvault MediaAgent 11.46.0-11.46.29, 11.44.0-11.44.24, 11.40.0-11.40.77, 11.36.0-11.36.126.

Is there a fix for CVE-2026-77100?

Yes: fixed in MediaAgent and HyperScale: 11.46.30 and higher, 11.44.25 and higher, 11.40.78 and higher, 11.36.127 and higher. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-77100 attacked?

It is attacked over the network, in a hosted service.

Am I affected by CVE-2026-77100?

Check whether you run Commvault HyperScale or Commvault MediaAgent at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-77100: Commvault MediaAgent heap buffer overflow denial of service

CVE-2026-77100 · Severity: info · Published 2026-10-13

Commvault MediaAgent, a backup and recovery component, contains a heap buffer overflow that can crash the service and disrupt backup operations. An attacker can exploit this vulnerability to cause a denial of service, potentially preventing organizations from completing critical backups and recovery tasks. Upgrading to the patched maintenance releases resolves the issue.

Vendors: Commvault.

Quick answers

Is CVE-2026-77100 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-77100 being exploited in the wild.
How severe is CVE-2026-77100?: Informational severity, published 13 October 2026.
Which products and versions are affected?: Commvault HyperScale 11.46.0-11.46.29, 11.44.0-11.44.24, 11.40.0-11.40.77, 11.36.0-11.36.126; Commvault MediaAgent 11.46.0-11.46.29, 11.44.0-11.44.24, 11.40.0-11.40.77, 11.36.0-11.36.126.
Is there a fix for CVE-2026-77100?: Yes: fixed in MediaAgent and HyperScale: 11.46.30 and higher, 11.44.25 and higher, 11.40.78 and higher, 11.36.127 and higher. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-77100 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-77100?: Check whether you run Commvault HyperScale or Commvault MediaAgent at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: MediaAgent and HyperScale: 11.46.30 and higher, 11.44.25 and higher, 11.40.78 and higher, 11.36.127 and higher

Technical details

A heap-based buffer overflow in Commvault MediaAgent allows remote exploitation to trigger a denial of service condition. The vulnerability affects multiple maintained versions across Linux and Windows platforms. Patch updates are available for all affected versions: 11.46.30+, 11.44.25+, 11.40.78+, and 11.36.127+.

Affected products

Commvault MediaAgent 11.46.0-11.46.29, 11.44.0-11.44.24, 11.40.0-11.40.77, 11.36.0-11.36.126
Commvault HyperScale 11.46.0-11.46.29, 11.44.0-11.44.24, 11.40.0-11.40.77, 11.36.0-11.36.126

Timeline

2026-10-13: disclosed

References

https://documentation.commvault.com/securityadvisories/CV_2026_10_6.html

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