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: 0.5%, top 58% 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
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.7Exploit: None knownExposed: 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
54(Track)
EG Risk 54/100SSVC: 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 computed
Severity87% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
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 8× in last 7d / 49× 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. 2026-09-06 13:47 UTCEPSS rescore
  2. 2026-09-05 20:34 UTCEG score recompute
  3. 2026-09-05 15:31 UTCEPSS rescore
  4. 2026-09-04 05:07 UTCEPSS rescore
  5. 2026-09-02 14:12 UTCEPSS rescore
  6. 2026-09-01 13:54 UTCEPSS rescore
  7. 2026-09-01 04:40 UTCEPSS rescore
  8. 2026-08-31 04:02 UTCEG score recompute
  9. 2026-08-30 19:17 UTCEPSS rescore
  10. 2026-08-30 03:30 UTCEG score recompute
  11. 2026-08-30 01:22 UTCEPSS rescore
  12. 2026-08-28 21:42 UTCEPSS rescore
  13. 2026-08-27 15:17 UTCEG score recompute
  14. 2026-08-27 14:25 UTCEPSS rescore
  15. 2026-08-27 02:27 UTCEG score recompute
  16. 2026-08-26 14:46 UTCEPSS rescore
  17. 2026-08-25 13:53 UTCEG score recompute
  18. 2026-08-25 13:49 UTCEPSS rescore
  19. 2026-08-25 01:41 UTCEG score recompute
  20. 2026-08-24 13:34 UTCEG score recompute
  21. 2026-08-23 01:05 UTCEG score recompute
  22. 2026-08-23 00:19 UTCEPSS rescore
  23. 2026-08-22 00:45 UTCEG score recompute
  24. 2026-08-21 23:49 UTCEPSS rescore
  25. 2026-08-21 00:22 UTCEG score recompute
Show 71 more
  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-19 23:52 UTCEG score recompute
  3. 2026-08-19 17:04 UTCEPSS rescore
  4. 2026-08-18 21:51 UTCEG score recompute
  5. 2026-08-18 13:48 UTCEPSS rescore
  6. 2026-08-17 21:18 UTCEG score recompute
  7. 2026-08-17 13:47 UTCEPSS rescore
  8. 2026-08-16 17:54 UTCEG score recompute
  9. 2026-08-16 14:56 UTCEPSS rescore
  10. 2026-08-16 05:46 UTCEG score recompute
  11. 2026-08-15 05:32 UTCEG score recompute
  12. 2026-08-15 01:30 UTCEPSS rescore
  13. 2026-08-14 05:01 UTCEG score recompute
  14. 2026-08-13 22:00 UTCEPSS rescore
  15. 2026-08-12 16:40 UTCEG score recompute
  16. 2026-08-12 13:51 UTCEPSS rescore
  17. 2026-08-11 16:26 UTCEG score recompute
  18. 2026-08-11 04:19 UTCEG score recompute
  19. 2026-08-11 00:00 UTCEPSS rescore
  20. 2026-08-09 15:57 UTCEG score recompute
  21. 2026-08-09 13:47 UTCEPSS rescore
  22. 2026-08-09 03:50 UTCEG score recompute
  23. 2026-08-08 16:37 UTCEPSS rescore
  24. 2026-08-08 03:35 UTCEG score recompute
  25. 2026-08-06 15:14 UTCEG score recompute
  26. 2026-08-06 13:47 UTCEPSS rescore
  27. 2026-08-06 03:06 UTCEG score recompute
  28. 2026-08-05 19:17 UTCEPSS rescore
  29. 2026-08-05 19:17 UTCEPSS rescore
  30. 2026-08-05 01:52 UTCEG score recompute
  31. 2026-08-04 15:10 UTCEPSS rescore
  32. 2026-08-04 13:45 UTCEG score recompute
  33. 2026-08-04 10:39 UTCEPSS rescore
  34. 2026-08-03 13:31 UTCEG score recompute
  35. 2026-08-03 10:36 UTCEPSS rescore
  36. 2026-08-02 13:16 UTCEG score recompute
  37. 2026-08-02 02:27 UTCEPSS rescore
  38. 2026-08-01 13:02 UTCEG score recompute
  39. 2026-08-01 04:16 UTCEPSS rescore
  40. 2026-07-31 00:36 UTCEG score recompute
  41. 2026-07-30 16:28 UTCEPSS rescore
  42. 2026-07-30 12:28 UTCEG score recompute
  43. 2026-07-30 01:30 UTCEPSS rescore
  44. 2026-07-30 01:30 UTCEPSS rescore
  45. 2026-07-29 00:06 UTCEG score recompute
  46. 2026-07-28 15:37 UTCEPSS rescore
  47. 2026-07-27 23:48 UTCEG score recompute
  48. 2026-07-27 14:14 UTCEPSS rescore
  49. 2026-07-26 23:32 UTCEG score recompute
  50. 2026-07-26 14:54 UTCEPSS rescore
  51. 2026-07-26 14:54 UTCEPSS rescore
  52. 2026-07-26 11:24 UTCEG score recompute
  53. 2026-07-25 14:18 UTCEPSS rescore
  54. 2026-07-25 14:18 UTCEPSS rescore
  55. 2026-07-24 14:18 UTCEPSS rescore
  56. 2026-07-24 14:18 UTCEPSS rescore
  57. 2026-07-23 14:18 UTCEPSS rescore
  58. 2026-07-23 14:18 UTCEPSS rescore
  59. 2026-07-23 03:22 UTCEG score recompute
  60. 2026-07-22 14:08 UTCEPSS rescore
  61. 2026-07-22 14:08 UTCEPSS rescore
  62. 2026-07-21 15:25 UTCEPSS rescore
  63. 2026-07-21 15:25 UTCEPSS rescore
  64. 2026-07-20 17:08 UTCEPSS rescore
  65. 2026-07-19 14:31 UTCEPSS rescore
  66. 2026-07-19 02:34 UTCEG score recompute
  67. 2026-07-19 02:29 UTCEPSS rescore
  68. 2026-07-18 10:04 UTCEPSS rescore
  69. 2026-07-17 14:12 UTCEG score recompute
  70. 2026-07-16 19:45 UTCEG score recompute
  71. 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 1% probability of exploitation in the next 30 days, which ranks it in the top 57.4% of all scored CVEs.
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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