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CVE-2026-73568— py-libp2p: yamux connection DoS via oversized data frame

Quick assessment

Affected
libp2p py-libp2p
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

py-libp2p 是 libp2p 网络协议栈的 Python 实现。在 0.7.0 及更早版本中，libp2p/stream_muxer/yamux/yamux.py 文件中的 yamux handle_incoming() 方法在使用 read_exactly() 读取攻击者可控制的 32 位 DATA 帧长度后，才对该长度进行 MAX_WINDOW_SIZE 验证或检查 stream_id 是否存在。任何已完成标准 Noise 握手的对等节点，均可发送一个 12 字节的帧，声明其数据体长度为 0xFFFFF

CVSS 7.5 · High EPSS 0.49% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
libp2p py-libp2p <= 0.7.0 affected
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I. Basic Information for CVE-2026-73568

Vulnerability Information
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Vulnerability Title
py-libp2p: yamux connection DoS via oversized data frame
Source: CVE Program / CVE List V5
Vulnerability Description
py-libp2p is the Python implementation of the libp2p networking stack. In 0.7.0 and earlier, the yamux handle_incoming() method in libp2p/stream_muxer/yamux/yamux.py reads an attacker-controlled 32-bit DATA frame length with read_exactly() before validating it against MAX_WINDOW_SIZE or checking whether stream_id exists. A peer that completes the standard Noise handshake can send a 12-byte frame declaring a 0xFFFFFFFF body and then withhold the body, causing the sequential yamux read loop used by the default new_host() configuration to block and preventing every stream on that connection from making progress. No fixed version is available as of this review.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
libp2p py-libp2p <= 0.7.0 -

II. Public POCs for CVE-2026-73568

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9311 chars
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III. Intelligence Information for CVE-2026-73568

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Patches & Fixes for CVE-2026-73568 (1)

Vendor Advisories for CVE-2026-73568 (1)

IV. Related Vulnerabilities

Same product: py-libp2p
Same vendor: libp2p
Same weakness: CWE-400

V. Comments for CVE-2026-73568

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