Vulnerability Description
Sliver is a command and control framework that uses a custom Wireguard netstack. Prior to 1.7.0, the DNS C2 listener accepts unauthenticated TOTP bootstrap messages and allocates server-side DNS sessions without validating OTP values, even when EnforceOTP is enabled. Because sessions are stored without a cleanup/expiry path in this flow, an unauthenticated remote actor can repeatedly create sessions and drive memory exhaustion. This vulnerability is fixed in 1.7.0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Bishopfox | Sliver | < 1.7.0 |
Related Weaknesses (CWE)
References
- https://github.com/BishopFox/sliver/releases/tag/v1.7.0ProductRelease Notes
- https://github.com/BishopFox/sliver/security/advisories/GHSA-wxrw-gvg8-fqjpExploitVendor Advisory
FAQ
What is CVE-2026-25791?
CVE-2026-25791 is a vulnerability with a CVSS score of 7.5 (HIGH). Sliver is a command and control framework that uses a custom Wireguard netstack. Prior to 1.7.0, the DNS C2 listener accepts unauthenticated TOTP bootstrap messages and allocates server-side DNS sessi...
How severe is CVE-2026-25791?
CVE-2026-25791 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-25791?
Check the references section above for vendor advisories and patch information. Affected products include: Bishopfox Sliver.