# CVE-2026-25791: Sliver has DNS C2 OTP Bypass that Allows Unauthenticated Session Flooding and Denial of Service

Source: https://junglewise.ai/threats/cve-2026-25791-sliver-has-dns-c2-otp-bypass-that-allows-unauthenticated-session  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-17  
License: CC BY 4.0 with a link back

CVE-2026-25791 · Severity: low · CVSS 3.1 · Published 2026-02-17

Sliver has DNS C2 OTP Bypass that Allows Unauthenticated Session Flooding and Denial of Service in github.com/bishopfox/sliver

Technologies: [github.com/bishopfox/sliver (Go)](https://junglewise.ai/threats/technologies/github-com-bishopfox-sliver). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-25791 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-25791 being exploited in the wild.

**How severe is CVE-2026-25791?** Low severity, with a CVSS score of 3.1, published 17 February 2026.

**Which products and versions are affected?** github.com/bishopfox/sliver (Go) SEMVER:introduced=0, SEMVER:introduced=0,fixed=1.6.12.

**Is there a fix for CVE-2026-25791?** Yes. github.com/bishopfox/sliver (Go): upgrade to 1.6.12 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-25791?** Check whether you run github.com/bishopfox/sliver (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/bishopfox/sliver (Go): upgrade to 1.6.12 or later

  ```sh
  go get github.com/bishopfox/sliver@v1.6.12
  ```


## Affected products

- github.com/bishopfox/sliver (Go) SEMVER:introduced=0, SEMVER:introduced=0,fixed=1.6.12

## Identifiers

- CVE-2026-25791
- GHSA-wxrw-gvg8-fqjp
- GO-2026-4466

## Related threats

- [Sliver unauthenticated memory exhaustion in HTTP(S) listener](https://junglewise.ai/threats/cve-2026-77622-sliver-unauthenticated-memory-exhaustion-denial-of-service-in)
- [GO-2026-4899 - Sliver: Nil Pointer Dereference in tunnelCloseHandler causes panic when a reverse tunnel (rportfwd)…](https://junglewise.ai/threats/go-2026-4899-sliver-nil-pointer-dereference-in-tunnelclosehandler-bd83eea8)
- [BishopFox Sliver unauthenticated remote access in MCP interface](https://junglewise.ai/threats/cve-2026-34227-bishopfox-sliver-unauthenticated-remote-access-in-mcp-interface)
- [Sliver: Nil Pointer Dereference in tunnelCloseHandler causes panic when a reverse tunnel (rportfwd) close is attempted](https://junglewise.ai/threats/sliver-nil-pointer-dereference-in-tunnelclosehandler-causes-panic-when-df5d6c15)
- [Sliver Vulnerable to Authenticated OOM via Memory Exhaustion in mTLS/WireGuard Transports](https://junglewise.ai/threats/cve-2026-32941-sliver-vulnerable-to-authenticated-oom-via-memory-exhaustion-in)