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CVE-2026-32314— Yamux remote Panic via malformed Data frame with SYN set and len = 262145

Quick assessment

Affected
libp2p rust-yamux
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.

Yamux是美国libp2p开源的一个多路复用器。 Yamux 0.13.10之前版本存在安全漏洞，该漏洞源于处理特制入站Data帧时可能触发恐慌，该帧设置SYN并使用大于DEFAULT_CREDIT的正文长度，可能导致连接状态机崩溃。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-32314

Vulnerability Information
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Vulnerability Title
Yamux remote Panic via malformed Data frame with SYN set and len = 262145
Source: CVE Program / CVE List V5
Vulnerability Description
Yamux is a stream multiplexer over reliable, ordered connections such as TCP/IP. Prior to 0.13.10, the Rust implementation of Yamux can panic when processing a crafted inbound Data frame that sets SYN and uses a body length greater than DEFAULT_CREDIT (e.g. 262145). On the first packet of a new inbound stream, stream state is created and a receiver is queued before oversized-body validation completes. When validation fails, the temporary stream is dropped and cleanup may call remove(...).expect("stream not found"), triggering a panic in the connection state machine. This is remotely reachable over a normal Yamux session and does not require authentication. This vulnerability is fixed in 0.13.10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
Yamux 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Yamux是美国libp2p开源的一个多路复用器。 Yamux 0.13.10之前版本存在安全漏洞，该漏洞源于处理特制入站Data帧时可能触发恐慌，该帧设置SYN并使用大于DEFAULT_CREDIT的正文长度，可能导致连接状态机崩溃。
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
libp2p rust-yamux < 0.13.10 -

II. Public POCs for CVE-2026-32314

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III. Intelligence Information for CVE-2026-32314

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Vendor Advisories for CVE-2026-32314 (1)

IV. Related Vulnerabilities

Same product: rust-yamux
Same vendor: libp2p
Same weakness: CWE-248

V. Comments for CVE-2026-32314

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