CVE-2026-1526— undici is vulnerable to Unbounded Memory Consumption in undici WebSocket permessage-deflate Decompression

undici is vulnerable to Unbounded Memory Consumption in undici WebSocket permessage-deflate Decompression

The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforcing any limit on the decompressed data size. A malicious WebSocket server can send a small compressed frame (a "decompression bomb") that expands to an extremely large size in memory, causing the Node.js process to exhaust available memory and crash or become unresponsive. The vulnerability exists in the PerMessageDeflate.decompress() method, which accumulates all decompressed chunks in memory and concatenates them into a single Buffer without checking whether the total size exceeds a safe threshold.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

对高度压缩数据的处理不恰当(数据放大攻击)

undici 安全漏洞

undici是Node.js开源的一个HTTP/1.1客户端。 undici存在安全漏洞，该漏洞源于在permessage-deflate解压缩期间存在无限制内存消耗，可能导致恶意WebSocket服务器发送小型压缩帧，使Node.js进程耗尽内存并崩溃或无响应。

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