High severityNVD Advisory· Published Feb 9, 2026· Updated Feb 10, 2026
Sliver has a DNS C2 OTP Bypass Allows Unauthenticated Session Flooding and Denial of Service
CVE-2026-25791
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/bishopfox/sliverGo | < 1.6.12 | 1.6.12 |
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
5- github.com/advisories/GHSA-wxrw-gvg8-fqjpghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-25791ghsaADVISORY
- github.com/BishopFox/sliver/commit/2b65089b27c553e79e69f1067cad1339e4f3d937ghsaWEB
- github.com/BishopFox/sliver/releases/tag/v1.7.0ghsax_refsource_MISCWEB
- github.com/BishopFox/sliver/security/advisories/GHSA-wxrw-gvg8-fqjpghsax_refsource_CONFIRMWEB
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