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CVE-2026-54463— websocket-driver: Memory exhaustion via abuse of protocol length headers

Quick assessment

Affected
faye websocket-driver-ruby
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 0.8.1之前版本存在资源管理错误漏洞，该漏洞源于长度标头允许编码任意大整数，可导致内存无限制消耗并引发主机内存耗尽。

AI Predicted 7.5 Difficulty: Easy EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
faye websocket-driver-ruby < 0.8.1 affected
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I. Basic Information for CVE-2026-54463

Vulnerability Information
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Vulnerability Title
websocket-driver: Memory exhaustion via abuse of protocol length headers
Source: CVE Program / CVE List V5
Vulnerability Description
websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.8.1, draft versions of the WebSocket protocol in websocket-driver include a length header that allows an arbitrarily large integer to be encoded as bytes with the high bit set, and a server or client can send an indefinite sequence of 0x80 or higher bytes that the peer parses into an ever-growing Ruby integer. This can make a WebSocket connection consume an unbounded amount of memory and lead to the host process running out of memory. This issue is fixed in version 0.8.1.
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: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 0.8.1之前版本存在资源管理错误漏洞，该漏洞源于长度标头允许编码任意大整数，可导致内存无限制消耗并引发主机内存耗尽。
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-ruby < 0.8.1 -

II. Public POCs for CVE-2026-54463

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III. Intelligence Information for CVE-2026-54463

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Patches & Fixes for CVE-2026-54463 (1)

Vendor Advisories for CVE-2026-54463 (1)

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

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

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-54463

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