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.
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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
3- ghsa-coords2 versionspkg:golang/github.com/bishopfox/sliverpkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2015.6
< 1.6.12+ 1 more
- (no CPE)range: < 1.6.12
- (no CPE)range: < 0.0.20260226T182644-150000.1.149.1
Patches
Vulnerability mechanics
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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