CVE-2026-77102: CommServe contained a heap-based buffer overflow issue affecting service availability

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-77102 is a high-severity flaw (CVSS 7.5) affecting commvault. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-09-08
Last modified	2026-09-09

Publisher (CNA): Commvault · Vendor: commvault

Last updated 2026-09-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-08 13:17 UTCPublished CVE record published
2026-09-09 15:55 UTCUpdated Record last modified

commvault commvault UPGRADE

Affected: >= 11.36.0 and < 11.36.123 · >= 11.40.0 and < 11.40.72 · >= 11.44.0 and < 11.44.20 · >= 11.46.0 and < 11.46.20

Fixed in: 11.36.123, 11.40.72, 11.44.20, 11.46.20

Safe to downgrade to: a release before 11.36.0

1. Check installed version

apt-cache policy commvault || rpm -q commvault || commvault --version

2. UPGRADE to 11.36.123 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade commvault

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade commvault

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 11.36.0 (Debian / Ubuntu)

apt-cache madison commvault sudo apt install commvault=<VERSION_BEFORE_11.36.0> sudo apt-mark hold commvault

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list commvault sudo dnf downgrade commvault-<VERSION_BEFORE_11.36.0> sudo dnf versionlock add commvault

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-77102?

commvault: upgrade to 11.36.123, 11.40.72, 11.44.20, 11.46.20. Exact commands for each OS are on this page.

Is CVE-2026-77102 being exploited?

CVE-2026-77102 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-77102 affect?

CVE-2026-77102 affects commvault. Severity is high (CVSS 7.5). CommServe contained a heap-based buffer overflow issue affecting service availability. Software customers upgrade to resolved maintenance release. Update CommServe.

How urgent is CVE-2026-77102?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

Software pages

Commvault vulnerabilities

Related CVEs

CVE-2026-13738 CRITICAL 9.8 UPGRADE CommServe contained an authorization bypass vulnerability affecting a limited set of command execution operati
CVE-2026-13737 CRITICAL 9.8 UPGRADE CommServe contained an allowlist bypass vulnerability affecting command execution authorization
CVE-2026-13739 CRITICAL 9.8 UPGRADE A legacy endpoint in Command Center contained an unauthenticated server-side request forgery (SSRF) vulnerabil
CVE-2026-77106 HIGH 8.8 UPGRADE Cvlaunchd contained a missing authorization issue affecting command execution authorization
CVE-2026-77089 CRITICAL 9.8 UPGRADE Command Center API contained an authentication bypass issue affecting privilege management

References

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