CVE-2026-54464Network attack vector

Resource-limit bypass via pre-decompression length checks

Published Jul 17, 2026 · Updated Jul 17, 2026

Resource-limit bypass in Faye websocket-driver before 0.8.1 allows remote attackers to exceed configured message-size limits. The HyBi driver's emit_message path checks max_length against compressed frame headers before extensions run, so a crafted compressed message expands past the configured limit without rejection. Exploitation requires permessage-deflate negotiation and drives application memory and processing above intended limits; no confidentiality or integrity impact is reported.

CVSS severity6.3
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource-limit bypass in Faye websocket-driver before 0.8.1 allows remote attackers to exceed configured message-size limits. The HyBi driver's emit_message path checks max_length against compressed frame headers before extensions run, so a crafted compressed message expands past the configured limit without rejection. Exploitation requires permessage-deflate negotiation and drives application memory and processing above intended limits; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2026-54464
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
Faye
Product
websocket-driver-ruby
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Faye · websocket-driver-rubyversion=< 0.8.1

Published CVSS scores

6.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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