CVE-2026-54490: 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

unknownCVE-2026-54490

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: unknown
Published: 2026-07-17
Last updated: 2026-07-23
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-54490

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-544900.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 18% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-54490	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

mediumGHSA-mp7j-qc5w-4988: websocket-driver: Resource limit bypass via message compressionghsa

Recent advisories for websocket-driver is a

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-54466: websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.7.5, the frame…nvd · 2026-07-17
unknownCVE-2026-54465: websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.8.1, when webs…nvd · 2026-07-17
unknownCVE-2026-54463: websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.8.1, draft ver…nvd · 2026-07-17
mediumGHSA-mp7j-qc5w-4988: websocket-driver: Resource limit bypass via message compressionghsa · 2026-07-15
criticalGHSA-xv26-6w52-cph6: websocket-driver: Message corruption via abuse of protocol length headersghsa · 2026-07-15
mediumGHSA-8j3g-f24p-4mpw: websocket-driver: Memory exhaustion in HTTP header parserghsa · 2026-07-15