CVE-2026-25791

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductBishopfox Sliver

PublishedFeb 9, 2026

First seenFeb 9, 2026

Weakness typeCWE-306Missing authentication for critical function CWE-400Uncontrolled resource consumption

How to fix

Update

bishopfox sliver1.7.0 or later
github.com/bishopfox/sliver1.6.12 or later

Affected products

Product	Affected versions	Fixed in
bishopfox sliver	v < 1.7.0	1.7.0
github.com/bishopfox/sliverGo	v < 1.6.12, No range specified	1.6.12

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