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CVE-2026-32941— Sliver Vulnerable to Authenticated OOM via Memory Exhaustion in mTLS/WireGuard Transports

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及之前版本存在安全漏洞，该漏洞源于C2服务器的mTLS和WireGuard C2传输层信任攻击者控制的长度前缀，可能导致远程内存耗尽和拒绝服务。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.44% · P37
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I. Basic Information for CVE-2026-32941

Vulnerability Information
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Vulnerability Title
Sliver Vulnerable to Authenticated OOM via Memory Exhaustion in mTLS/WireGuard Transports
Source: CVE Program / CVE List V5
Vulnerability Description
Sliver is a command and control framework that uses a custom Wireguard netstack. Versions 1.7.3 and below contain a Remote OOM (Out-of-Memory) vulnerability in the Sliver C2 server's mTLS and WireGuard C2 transport layer. The socketReadEnvelope and socketWGReadEnvelope functions trust an attacker-controlled 4-byte length prefix to allocate memory, with ServerMaxMessageSize allowing single allocations of up to ~2 GiB. A compromised implant or an attacker with valid credentials can exploit this by sending fabricated length prefixes over concurrent yamux streams (up to 128 per connection), forcing the server to attempt allocating ~256 GiB of memory and triggering an OS OOM kill. This crashes the Sliver server, disrupts all active implant sessions, and may degrade or kill other processes sharing the same host. The same pattern also affects all implant-side readers, which have no upper-bound check at all. The issue was not fixed at the the time of publication.
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:H/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Sliver 安全漏洞
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及之前版本存在安全漏洞，该漏洞源于C2服务器的mTLS和WireGuard C2传输层信任攻击者控制的长度前缀，可能导致远程内存耗尽和拒绝服务。
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-2026-32941

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III. Intelligence Information for CVE-2026-32941

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Vendor Advisories for CVE-2026-32941 (1)

IV. Related Vulnerabilities

Same product: sliver
Same vendor: BishopFox
Same weakness: CWE-770

V. Comments for CVE-2026-32941

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