CVE-2026-62963

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 78% 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
Trending — 3 sources updated this week
8.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.7Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Centrifugo is an open-source scalable real-time messaging server. Prior to 6.8.4, Centrifugo unidirectional WebSocket transport with uni_websocket.compression enabled enforced uni_websocket.message_size_limit against compressed wire-frame length in internal/websocket/conn.go advanceFrame, but ReadMessage used io.ReadAll after decompression without an output cap, allowing unauthenticated requests to /connection/uni_websocket to trigger large memory and CPU consumption. This issue is fixed in version 6.8.4.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
—
EPSS
22.3%
KEV
Not listed

Published

July 16, 2026

Last Modified

July 17, 2026

Advisory Details (4)

Auto-updated Jul 16, 2026
Patch available. Sources: github, github_commit, github_pr, github_release.
github Patch Available

Decompression bomb DoS via permessage-deflate in unidirectional WebSocket transport · Advisory · centrifugal/centrifugo · GitHub

https://github.com/centrifugal/centrifugo/security/advisories/GHSA-q6mr-3g59-5m8x
github_release Patch Available

v6.8.4

Patch available: centrifugal/centrifugo v6.8.4

https://github.com/centrifugal/centrifugo/releases/tag/v6.8.4
github_pr

Bound default decompressed WebSocket message size, options to tweak the limit

Fix merged in centrifugal/centrifugo PR #1162 on 2026-06-28 — awaiting tagged release

https://github.com/centrifugal/centrifugo/pull/1162
github_commit

commit 46d40e4ac3a5 (centrifugal/centrifugo)

Fix landed in centrifugal/centrifugo commit 46d40e4ac3a5 — awaiting tagged release

https://github.com/centrifugal/centrifugo/commit/46d40e4ac3a5446c9745f8b219197166ae12a6e5

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 12× 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.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:25 UTCEPSS rescore
  4. 2026-07-21 15:25 UTCEPSS rescore
  5. 2026-07-20 17:08 UTCEPSS rescore
  6. 2026-07-19 14:31 UTCEPSS rescore
  7. 2026-07-19 02:34 UTCEG score recompute
  8. 2026-07-19 02:29 UTCEPSS rescore
  9. 2026-07-18 10:04 UTCEPSS rescore
  10. 2026-07-17 14:12 UTCEG score recompute
  11. 2026-07-16 19:45 UTCEG score recompute
  12. 2026-07-16 19:44 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-62963?
CVE-2026-62963 is a high vulnerability published on July 16, 2026. Centrifugo is an open-source scalable real-time messaging server. Prior to 6.8.4, Centrifugo unidirectional WebSocket transport with uniwebsocket.compression enabled enforced uniwebsocket.messagesizelimit against compressed wire-frame length in internal/websocket/conn.go advanceFrame, but…
When was CVE-2026-62963 disclosed?
CVE-2026-62963 was first published in the National Vulnerability Database on July 16, 2026, with the most recent update on July 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-62963 actively exploited?
CVE-2026-62963 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-62963?
CVE-2026-62963 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-62963?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-62963, 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.

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