CVE-2026-4391
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA security vulnerability has been detected in TeamSpeak 3 Server up to 3.13.7. This vulnerability affects unknown code of the component ECC Key Parser. Such manipulation leads to heap-based buffer overflow. The attack may be launched remotely. Upgrading to version 3.13.8 is able to resolve this issue. It is suggested to upgrade the affected component.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceHeap-based buffer overflow in the ECC Key Parser component of TeamSpeak 3 Server up to version 3.13.7 allows remote attackers to potentially execute arbitrary code via specially crafted ECC keys.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify TeamSpeak 3 Server installationLocate the TeamSpeak 3 Server executable or check running processes for ts3server.exe (Windows) or ts3server (Linux/Unix)Affected if TeamSpeak 3 Server is not running or installed
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Determine installed TeamSpeak 3 Server versionCheck the server version by viewing the startup logs, using the server query command 'version', or checking the version file in the server directoryAffected if Version is 3.13.7 or earlier (versions 3.13.8 and later are fixed)
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Verify ECC Key Parser is in useCheck server configuration and logs for ECC key usage - look for ECC-related settings in the configuration files or ECDSA/ECC key references in server logsAffected if ECC key parsing is actively used; if ECC keys are not being used or parsed, the vulnerability may not be exploitable
User is affected if running TeamSpeak 3 Server version 3.13.7 or earlier AND ECC key parsing is enabled or being used by clients
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedUpgrade TeamSpeak 3 Server to version 3.13.8 or later to resolve the heap-based buffer overflow vulnerability in the ECC Key Parser.
3.13.8
- Stop the TeamSpeak 3 Server service
- Back up the existing TeamSpeak 3 Server installation and data directory
- Download TeamSpeak 3 Server version 3.13.8 from the official source (files.teamspeak-services.com or www.teamspeak.com)
- Extract and install the new version to replace the existing installation
- Start the TeamSpeak 3 Server service
- Verify the server is running version 3.13.8 by checking the server logs or connecting with a client
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-4391 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-4391 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data