CVE-2026-16632

HIGHPre-NVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

Score 7.3 from GitHub Security Advisory published 2026-07-23. a secondary CVSS source baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.3Exploit: Elevated riskExposed: 0

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

A flaw has been found in boazsegev facil.io up to 0.7.4. Affected is the function websocket_on_protocol_error in the library lib/facil/http/parsers/websocket_parser.h of the component WebSocket Frame Parser. This manipulation of the argument on_message causes improper input validation. The attack can be initiated remotely. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

CVSS v3
7.3
EG Score
7.3(medium)
EG Risk
64(Attend)
EG Risk 64/100SSVC: Attend

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
Severity73% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

July 22, 2026

Last Modified

July 23, 2026

Advisory Details (2)

Auto-updated Jul 23, 2026
No patch confirmed yet.
generic

[Security] WebSocket parser executes on_message for unmasked client frames before terminating the connection · Issue #169 · boazsegev/facil.io · GitHub

https://github.com/boazsegev/facil.io/issues/169
generic

GitHub - boazsegev/facil.io: Your high performance web application C framework · GitHub

https://github.com/boazsegev/facil.io/

Vendor Advisories for CVE-2026-16632(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 111× 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.

Showing the most recent 100 of 144 total refreshes for this CVE.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-30 00:48 UTCEG score recompute
  3. 2026-08-30 00:48 UTCGHSA enrichment
  4. 2026-08-28 21:41 UTCEPSS rescore
  5. 2026-08-27 21:36 UTCEG score recompute
  6. 2026-08-27 21:36 UTCGHSA enrichment
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-27 10:22 UTCGHSA enrichment
  9. 2026-08-26 23:08 UTCEG score recompute
  10. 2026-08-26 23:08 UTCGHSA enrichment
  11. 2026-08-26 14:46 UTCEPSS rescore
  12. 2026-08-26 11:53 UTCGHSA enrichment
  13. 2026-08-26 00:39 UTCEG score recompute
  14. 2026-08-26 00:39 UTCGHSA enrichment
  15. 2026-08-25 13:48 UTCEPSS rescore
  16. 2026-08-25 13:11 UTCGHSA enrichment
  17. 2026-08-25 01:57 UTCGHSA enrichment
  18. 2026-08-24 14:43 UTCEG score recompute
  19. 2026-08-24 14:43 UTCGHSA enrichment
  20. 2026-08-24 03:29 UTCGHSA enrichment
  21. 2026-08-23 14:40 UTCGHSA enrichment
  22. 2026-08-23 03:26 UTCEG score recompute
  23. 2026-08-23 03:26 UTCGHSA enrichment
  24. 2026-08-23 00:19 UTCEPSS rescore
  25. 2026-08-22 16:11 UTCGHSA enrichment
Show 75 more
  1. 2026-08-22 04:50 UTCEG score recompute
  2. 2026-08-22 04:50 UTCGHSA enrichment
  3. 2026-08-21 23:49 UTCEPSS rescore
  4. 2026-08-21 17:36 UTCGHSA enrichment
  5. 2026-08-21 06:22 UTCEG score recompute
  6. 2026-08-21 06:22 UTCGHSA enrichment
  7. 2026-08-20 22:55 UTCEPSS rescore
  8. 2026-08-20 19:08 UTCGHSA enrichment
  9. 2026-08-20 07:55 UTCGHSA enrichment
  10. 2026-08-19 20:41 UTCEG score recompute
  11. 2026-08-19 20:41 UTCGHSA enrichment
  12. 2026-08-19 17:03 UTCEPSS rescore
  13. 2026-08-19 06:30 UTCGHSA enrichment
  14. 2026-08-18 19:09 UTCEG score recompute
  15. 2026-08-18 19:09 UTCGHSA enrichment
  16. 2026-08-18 13:48 UTCEPSS rescore
  17. 2026-08-18 04:22 UTCGHSA enrichment
  18. 2026-08-17 17:04 UTCEG score recompute
  19. 2026-08-17 17:03 UTCGHSA enrichment
  20. 2026-08-17 13:47 UTCEPSS rescore
  21. 2026-08-17 05:49 UTCGHSA enrichment
  22. 2026-08-16 17:59 UTCEG score recompute
  23. 2026-08-16 17:59 UTCGHSA enrichment
  24. 2026-08-16 14:56 UTCEPSS rescore
  25. 2026-08-16 06:45 UTCEG score recompute
  26. 2026-08-16 06:45 UTCGHSA enrichment
  27. 2026-08-16 02:14 UTCEPSS rescore
  28. 2026-08-15 19:32 UTCGHSA enrichment
  29. 2026-08-15 08:18 UTCEG score recompute
  30. 2026-08-15 08:18 UTCGHSA enrichment
  31. 2026-08-15 01:30 UTCEPSS rescore
  32. 2026-08-14 21:04 UTCGHSA enrichment
  33. 2026-08-14 09:51 UTCGHSA enrichment
  34. 2026-08-13 22:37 UTCEG score recompute
  35. 2026-08-13 22:37 UTCGHSA enrichment
  36. 2026-08-13 22:00 UTCEPSS rescore
  37. 2026-08-13 11:23 UTCGHSA enrichment
  38. 2026-08-13 00:09 UTCEG score recompute
  39. 2026-08-13 00:09 UTCGHSA enrichment
  40. 2026-08-12 13:50 UTCEPSS rescore
  41. 2026-08-12 12:56 UTCGHSA enrichment
  42. 2026-08-12 01:41 UTCGHSA enrichment
  43. 2026-08-11 14:27 UTCEG score recompute
  44. 2026-08-11 14:27 UTCGHSA enrichment
  45. 2026-08-11 13:42 UTCEPSS rescore
  46. 2026-08-11 03:13 UTCEG score recompute
  47. 2026-08-11 03:13 UTCGHSA enrichment
  48. 2026-08-11 00:00 UTCEPSS rescore
  49. 2026-08-10 16:00 UTCGHSA enrichment
  50. 2026-08-10 04:45 UTCGHSA enrichment
  51. 2026-08-09 17:32 UTCEG score recompute
  52. 2026-08-09 17:32 UTCGHSA enrichment
  53. 2026-08-09 13:46 UTCEPSS rescore
  54. 2026-08-09 06:18 UTCGHSA enrichment
  55. 2026-08-08 19:05 UTCGHSA enrichment
  56. 2026-08-08 07:51 UTCGHSA enrichment
  57. 2026-08-07 20:38 UTCEG score recompute
  58. 2026-08-07 20:38 UTCGHSA enrichment
  59. 2026-08-07 09:24 UTCGHSA enrichment
  60. 2026-08-06 22:10 UTCEG score recompute
  61. 2026-08-06 22:10 UTCGHSA enrichment
  62. 2026-08-06 13:46 UTCEPSS rescore
  63. 2026-08-06 10:57 UTCGHSA enrichment
  64. 2026-08-05 23:43 UTCEG score recompute
  65. 2026-08-05 23:43 UTCGHSA enrichment
  66. 2026-08-05 19:17 UTCEPSS rescore
  67. 2026-08-05 12:29 UTCGHSA enrichment
  68. 2026-08-05 00:53 UTCEG score recompute
  69. 2026-08-05 00:53 UTCGHSA enrichment
  70. 2026-08-04 15:10 UTCEPSS rescore
  71. 2026-08-04 13:38 UTCEG score recompute
  72. 2026-08-04 13:38 UTCGHSA enrichment
  73. 2026-08-04 10:38 UTCEPSS rescore
  74. 2026-08-04 02:24 UTCGHSA enrichment
  75. 2026-08-03 15:11 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-16632?
CVE-2026-16632 is a high vulnerability published on July 22, 2026. A flaw has been found in boazsegev facil.io up to 0.7.4. Affected is the function websocketonprotocolerror in the library lib/facil/http/parsers/websocketparser.h of the component WebSocket Frame Parser. This manipulation of the argument on_message causes improper input validation. The attack can…
When was CVE-2026-16632 disclosed?
CVE-2026-16632 was first published in the National Vulnerability Database on July 22, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16632 actively exploited?
CVE-2026-16632 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 57.9% of all scored CVEs.
What is the CVSS score of CVE-2026-16632?
CVE-2026-16632 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-16632?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16632, 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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