CVE-2026-54463: websocket-driver is a WebSocket protocol handler with pluggable I/O

Q: How do I fix CVE-2026-54463?

websocket-driver: upgrade to 0.8.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-54463 being exploited?

CVE-2026-54463 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-54463 affect?

CVE-2026-54463 affects websocket-driver. Severity is high (CVSS 7.5). 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 t

Q: How urgent is CVE-2026-54463?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-54463 is a high-severity flaw (CVSS 7.5) affecting websocket-driver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-07-17
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc. · Vendor: faye

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-17 20:17 UTCPublished CVE record published
2026-10-24 20:10 UTCUpdated Record last modified

faye websocket-driver UPGRADE

Affected: < 0.8.1

Fixed in: 0.8.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy websocket-driver || rpm -q websocket-driver || websocket-driver --version

2. UPGRADE to 0.8.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade websocket-driver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade websocket-driver

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-54463?

websocket-driver: upgrade to 0.8.1. Exact commands for each OS are on this page.

Is CVE-2026-54463 being exploited?

CVE-2026-54463 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-54463 affect?

CVE-2026-54463 affects websocket-driver. Severity is high (CVSS 7.5). 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 t

How urgent is CVE-2026-54463?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

Software pages

Ruby vulnerabilities

Related CVEs

CVE-2026-54465 HIGH 7.5 UPGRADE websocket-driver is a WebSocket protocol handler with pluggable I/O
CVE-2026-54466 HIGH 7.5 UPGRADE websocket-driver is a WebSocket protocol handler with pluggable I/O

References

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