CVE-2026-54466: websocket-driver is a WebSocket protocol handler with pluggable I/O

Q: How do I fix CVE-2026-54466?

websocket-driver: upgrade to 0.7.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-54466 being exploited?

CVE-2026-54466 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-2026-54466 affect?

CVE-2026-54466 affects websocket-driver. Severity is high (CVSS 7.5). websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.7.5, the frame format in draft versions of the WebSocket protocol includes a length header that allows an arbitrarily large integer to be encoded as a sequence

Q: How urgent is CVE-2026-54466?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2026-54466 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 0.7.5, the frame format in draft versions of the WebSocket protocol includes a length header that allows an arbitrarily large integer to be encoded as a sequence of bytes with the high bit set. By sending an indefinite sequence of bytes with values 0x80 or above, a client can make the server parse these bytes into an ever-growing integer in lib/websocket/driver/draft75.

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	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-130
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 21:17 UTCPublished CVE record published
2026-10-24 20:10 UTCUpdated Record last modified

faye websocket-driver UPGRADE

Affected: < 0.7.5

Fixed in: 0.7.5

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 0.7.5 (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-2026-54466?

websocket-driver: upgrade to 0.7.5. Exact commands for each OS are on this page.

Is CVE-2026-54466 being exploited?

CVE-2026-54466 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-2026-54466 affect?

CVE-2026-54466 affects websocket-driver. Severity is high (CVSS 7.5). websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.7.5, the frame format in draft versions of the WebSocket protocol includes a length header that allows an arbitrarily large integer to be encoded as a sequence

How urgent is CVE-2026-54466?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-54463 HIGH 7.5 UPGRADE websocket-driver is a WebSocket protocol handler with pluggable I/O
CVE-2026-54465 HIGH 7.5 UPGRADE websocket-driver is a WebSocket protocol handler with pluggable I/O

References

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