CVE-2026-77101 CommServe Stack-based Buffer Overflow

What is CVE-2026-77101?

CVE-2026-77101 is a high-severity memory corruption vulnerability in Commvault Cloud, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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

Weakness: CWE-121

Which versions are affected by CVE-2026-77101?

It affects 1 product.

Products include Commvault Commvault.

How do I fix CVE-2026-77101?

No fix has been published for CVE-2026-77101 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-77101 being exploited?

There is no known exploitation of CVE-2026-77101 in the wild and no public exploit code.

Other vulnerabilities in Commvault Cloud

• CVE-2025-34028 Commvault Command Center Path Traversal Exploited Critical 9.3
• CVE-2025-3928 Commvault Web Server Unspecified Exploited High 8.7
• CVE-2017-18044 Command injection in n/a Critical 9.8
• CVE-2026-77089 Command Center API Authentication Bypass Critical 9.3
• CVE-2026-13737 Command Restriction Bypass Critical 9.2

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-wfc9-w7cq-xw2g.