CVE-2026-25791

HighCVSS 7.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-306 CWE-400

Affected software

Vendor	Product	Versions
BishopFox	sliver	< 1.7.0

References

https://github.com/BishopFox/sliver/releases/tag/v1.7.0Product, Release Notes
https://github.com/BishopFox/sliver/security/advisories/GHSA-wxrw-gvg8-fqjpExploit, Vendor Advisory

Timeline

Published: Feb 9, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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