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.
CVE-2026-54463
MEDIUMPre-NVD 6.96.9—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 64% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.9Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.9
- EG Score
- 6.9(medium)
- EG Risk
- 46(Track)EG Risk 46/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity69% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS
- 36.3%
- KEV
- Not listed
Published
July 15, 2026
Last Modified
July 20, 2026
Advisory Details (2)
Auto-updated Jul 17, 2026Patch available. Sources: github_commit, github.
github Patch Available
Memory exhaustion via abuse of protocol length headers · Advisory · faye/websocket-driver-ruby · GitHub
Affected: version 0.8.1. All users should upgrade to this
https://github.com/faye/websocket-driver-ruby/security/advisories/GHSA-ghhp-3qvg-889pgithub_commit
commit d0141f041f6e (faye/websocket-driver-ruby)
Fix landed in faye/websocket-driver-ruby commit d0141f041f6e — awaiting tagged release
https://github.com/faye/websocket-driver-ruby/commit/d0141f041f6e3677a951255d547a313e732ccbe0Vendor Advisories for CVE-2026-54463(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
RubyGems(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| websocket-driver | 0.1.0 ... 0.8.0 (32 versions) | 0.8.1 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 10× in last 7d / 11× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-23 03:19 UTCEG score recompute
- 2026-07-22 14:08 UTCEPSS rescore
- 2026-07-21 15:25 UTCEPSS rescore
- 2026-07-20 17:08 UTCEPSS rescore
- 2026-07-19 14:31 UTCEPSS rescore
- 2026-07-19 14:31 UTCEPSS rescore
- 2026-07-19 02:36 UTCEG score recompute
- 2026-07-19 02:29 UTCEPSS rescore
- 2026-07-17 20:15 UTCEG score recompute▲ 6.90
- 2026-07-17 20:14 UTCMITRE cvelistV5CVSS v3 → 6.9 · CVSS v4 → 6.9
- 2026-07-15 22:19 UTCEG score recompute
Related CVEs(same CWE)
Same CWE
10 shownCWE-770
- CVE-2018-20033EG 9.8CRITICAL
- CVE-2019-11479NVD 7.5EG 9.0EPSS 100%HIGH
- CVE-2019-11478NVD 5.3EG 9.0EPSS 100%MEDIUM
- CVE-2019-10088EG 8.8EPSS 91%HIGH
- CVE-2018-15462EG 8.6HIGH
- CVE-2018-15460EG 8.6HIGH
- CVE-2018-0137EG 8.6HIGH
- CVE-2008-5180NVD 5.3EG 7.9EPSS 99%MEDIUM
- CVE-2019-10094EG 7.8HIGH
- CVE-2018-16865EG 7.8HIGH
Frequently asked(5)
What is CVE-2026-54463?
CVE-2026-54463 is a medium vulnerability published on July 15, 2026. 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…
When was CVE-2026-54463 disclosed?
CVE-2026-54463 was first published in the National Vulnerability Database on July 15, 2026, with the most recent update on July 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54463 actively exploited?
CVE-2026-54463 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54463?
CVE-2026-54463 has a CVSS v3 base score of 6.9 (NVD).
How do I remediate CVE-2026-54463?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54463, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-54463
Is Your Infrastructure Affected by CVE-2026-54463?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.