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CVE-2026-54490— websocket-driver: Resource limit bypass via message compression

Quick assessment

Affected
faye websocket-driver-node
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.

faye websocket-driver是faye团队的一个WebSocket协议驱动库。 faye websocket-driver 0.7.5之前版本存在资源管理错误漏洞，该漏洞源于使用permessage-deflate扩展时消息大小限制检查压缩数据长度而非解压后长度，可能导致应用程序接受超出预期的消息并超出资源使用上限。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
faye websocket-driver-node < 0.7.5 affected
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I. Basic Information for CVE-2026-54490

Vulnerability Information
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Vulnerability Title
websocket-driver: Resource limit bypass via message compression
Source: CVE Program / CVE List V5
Vulnerability Description
websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.7.5, if this library is used with the permessage-deflate extension, a WebSocket server or client can be made to accept messages that are larger than the configured maximum message size because the limit is checked against the message frames' length headers, which give the size of the compressed data, not the size after decompression in lib/websocket/driver/hybi.js. This can lead to applications accepting larger messages than expected and exceeding their intended resource usage. This issue is fixed in version 0.7.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L
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
faye websocket-driver 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
faye websocket-driver是faye团队的一个WebSocket协议驱动库。 faye websocket-driver 0.7.5之前版本存在资源管理错误漏洞，该漏洞源于使用permessage-deflate扩展时消息大小限制检查压缩数据长度而非解压后长度，可能导致应用程序接受超出预期的消息并超出资源使用上限。
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
faye websocket-driver-node < 0.7.5 -

II. Public POCs for CVE-2026-54490

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III. Intelligence Information for CVE-2026-54490

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Patches & Fixes for CVE-2026-54490 (1)

Vendor Advisories for CVE-2026-54490 (1)

Same Patch Batch · faye · 2026-07-17 · 5 CVEs total

CVE-2026-54463 websocket-driver: Memory exhaustion via abuse of protocol length headers
CVE-2026-54464 websocket-driver: Resource limit bypass via message compression
CVE-2026-54465 websocket-driver: Memory exhaustion in HTTP header parser
CVE-2026-54466 websocket-driver: Message corruption via abuse of protocol length headers

IV. Related Vulnerabilities

Same product: websocket-driver-node
Same vendor: faye
Same weakness: CWE-770

V. Comments for CVE-2026-54490

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