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TI-2026-23367 Aliases CVE-2026-29781GHSA-hx52-cv84-jr5v

Sliver: Authenticated Nil-Pointer Dereference in Handlers

Priority MEDIUM 44CWE-476Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-476.

Summary

Sliver is a command and control framework that uses a custom Wireguard netstack. In versions from 1.7.3 and prior, a vulnerability exists in the Sliver C2 server's Protobuf unmarshalling logic due to a systemic lack of nil-pointer validation. By extracting valid implant credentials and omitting nested fields in a signed message, an authenticated actor can trigger an unhandled runtime panic. Because the mTLS, WireGuard, and DNS transport layers lack the panic recovery middleware present in the HTTP transport, this results in a global process termination. While requiring post-authentication access (a captured implant), this flaw effectively acts as an infrastructure "kill-switch," instantly severing all active sessions across the entire fleet and requiring a manual server restart to restore operations. At time of publication, there are no publicly available patches.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00568 47th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
BishopFoxsliverup to 1.7.3—No fix listedCNA
—github.com/bishopfox/sliver (Go)up to 1.7.3—No fix listedGHSA-hx52-cv84-jr5v
  • sliver VendorBishopFox Affected up to 1.7.3 Fixed in — No fix listed CNA
  • github.com/bishopfox/sliver (Go) Vendor— Affected up to 1.7.3 Fixed in — No fix listed GHSA-hx52-cv84-jr5v

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:bishopfox:sliver:*:*:*:*:*:*:*:*up to 1.7.3VulnerableBishopFox
  • cpe:2.3:a:bishopfox:sliver:*:*:*:*:*:*:*:* Versions up to 1.7.3 Vulnerable ·BishopFox

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-29781
  2. 2026-10-03 Alias added: GHSA-hx52-cv84-jr5v

References

Exploit 1

Advisory 1

Other 1

  • TI-2025-19960 Server-Side Request Forgery (SSRF) in sliver teamserver CVSS 4.0MEDIUM 6.9
  • TI-2023-17391 Sliver from v1.5.x to v1.5.39 has an improper cryptographic implementation, which allows… CVSS 3.1HIGH 8.1
  • TI-2026-26522 Sliver One-Click Remote Access: Insecure CORS & Unauthenticated MCP Interface CVSS 4.0MEDIUM 5.9
  • TI-2026-25389 Sliver Vulnerable to Authenticated OOM via Memory Exhaustion in mTLS/WireGuard Transports CVSS 4.0MEDIUM 5.7
  • TI-2026-20855 Sliver has a DNS C2 OTP Bypass Allows Unauthenticated Session Flooding and Denial of Service CVSS 3.1HIGH 7.5
  • TI-2026-20827 Website Path Traversal / Arbitrary File Read (Authenticated) in Sliver CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences