Bug 2501934 (CVE-2026-54463)

Summary:	CVE-2026-54463 websocket-driver: websocket-driver: Denial of Service via unbounded memory consumption in WebSocket length header
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	eshamard, jvasik, kaycoth, rblanco
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in websocket-driver, a WebSocket protocol handler. A remote attacker could exploit a vulnerability in how draft versions of the WebSocket protocol handle length headers. By sending an indefinite sequence of specially crafted bytes, an attacker can cause the affected component to consume an unbounded amount of memory. This can lead to a denial of service (DoS) by exhausting the host process's memory.	Story Points:	---
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Regression:	---	Mount Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-07-17 21:02:13 UTC

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.