# GO-2026-4899 - Sliver: Nil Pointer Dereference in tunnelCloseHandler causes panic when a reverse tunnel (rportfwd)…

Source: https://junglewise.ai/threats/go-2026-4899-sliver-nil-pointer-dereference-in-tunnelclosehandler-bd83eea8  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-02  
License: CC BY 4.0 with a link back

Severity: info · Published 2026-04-02

Sliver: Nil Pointer Dereference in tunnelCloseHandler causes panic when a reverse tunnel (rportfwd) close is attempted 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 This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Informational severity, published 2 April 2026.

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

**Is there a fix for This vulnerability?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected?** 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.

## Affected products

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

## 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)
- [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)
- [GO-2026-4609 - Sliver is Vulnerable to Authenticated Nil-Pointer Dereference through its Handlers in github.com/bishopfox/sliver](https://junglewise.ai/threats/cve-2026-29781-sliver-is-vulnerable-to-authenticated-nil-pointer-dereference)