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CVE-2026-29781— Sliver: Authenticated Nil-Pointer Dereference in Handlers

Quick assessment

Affected
BishopFox sliver
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Sliver是Bishop Fox开源的一个开源的跨平台对手模拟/红队框架。可以被各种规模的组织用来执行安全测试。 Sliver 1.7.3及之前版本存在代码问题漏洞，该漏洞源于Protobuf解组逻辑缺乏空指针验证，可能导致全局进程终止。

AI Predicted 6.5 Difficulty: Easy EPSS 0.54% · P44

Possible ATT&CK Techniques 1 AI

T1529 · System Shutdown/Reboot
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I. Basic Information for CVE-2026-29781

Vulnerability Information
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Vulnerability Title
Sliver: Authenticated Nil-Pointer Dereference in Handlers
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Sliver 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sliver是Bishop Fox开源的一个开源的跨平台对手模拟/红队框架。可以被各种规模的组织用来执行安全测试。 Sliver 1.7.3及之前版本存在代码问题漏洞，该漏洞源于Protobuf解组逻辑缺乏空指针验证，可能导致全局进程终止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
BishopFox sliver <= 1.7.3 -

II. Public POCs for CVE-2026-29781

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III. Intelligence Information for CVE-2026-29781

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Vendor Advisories for CVE-2026-29781 (1)

IV. Related Vulnerabilities

Same product: sliver
Same vendor: BishopFox
Same weakness: CWE-476

V. Comments for CVE-2026-29781

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