CVE-2026-58172

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-30. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

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

Ocelot through 24.1.0, fixed in commit f156fd4, contains a security control bypass vulnerability that allows denied clients to circumvent IP-based access restrictions by sending WebSocket upgrade requests. The WebSocket upgrade pipeline branch configured via MapWhen in OcelotPipelineExtensions.cs omits SecurityMiddleware, causing requests from blocked IP addresses to be proxied to downstream services without enforcement of the configured allow/block list.

CVSS v3
9.1
EG Score
9.1(high)
EPSS
33.1%
KEV
Not listed

Published

June 30, 2026

Last Modified

July 2, 2026

Advisory Details (4)

Auto-updated Jun 30, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
generic

Ocelot - IP Allow/Block List Bypass for WebSocket Upgrade Requests | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ocelot-ip-allow-block-list-bypass-for-websocket-upgrade-requests
github_pr

#2403 Add `SecurityOptions` support to the WebSocket pipeline

Fix merged in ThreeMammals/Ocelot PR #2406 on 2026-06-27 — awaiting tagged release

https://github.com/ThreeMammals/Ocelot/pull/2406
generic

IP allow and block list (SecurityOptions) bypassed for WebSocket upgrade requests · Issue #2403 · ThreeMammals/Ocelot · GitHub

https://github.com/ThreeMammals/Ocelot/issues/2403
github_commit

commit f156fd4017ca (ThreeMammals/Ocelot)

Fix landed in ThreeMammals/Ocelot commit f156fd4017ca — awaiting tagged release

https://github.com/ThreeMammals/Ocelot/commit/f156fd4017ca25025fffdad8ec56c1d657dfb402

Vendor Advisories for CVE-2026-58172(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 86× in last 7d / 86× 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. 2026-07-07 02:17 UTCEG score recompute
  2. 2026-07-07 02:16 UTCGHSA enrichment
  3. 2026-07-06 22:02 UTCEG score recompute
  4. 2026-07-06 22:02 UTCGHSA enrichment
  5. 2026-07-06 17:57 UTCEG score recompute
  6. 2026-07-06 17:56 UTCGHSA enrichment
  7. 2026-07-06 16:27 UTCEPSS rescore
  8. 2026-07-06 16:27 UTCEPSS rescore
  9. 2026-07-06 13:43 UTCEG score recompute
  10. 2026-07-06 13:42 UTCGHSA enrichment
  11. 2026-07-06 09:38 UTCEG score recompute
  12. 2026-07-06 09:37 UTCGHSA enrichment
  13. 2026-07-06 05:33 UTCEG score recompute
  14. 2026-07-06 05:33 UTCGHSA enrichment
  15. 2026-07-06 02:23 UTCEPSS rescore
  16. 2026-07-06 02:23 UTCEPSS rescore
  17. 2026-07-06 01:28 UTCEG score recompute
  18. 2026-07-06 01:28 UTCGHSA enrichment
  19. 2026-07-05 21:24 UTCEG score recompute
  20. 2026-07-05 21:24 UTCGHSA enrichment
  21. 2026-07-05 17:20 UTCEG score recompute
  22. 2026-07-05 17:20 UTCGHSA enrichment
  23. 2026-07-05 13:16 UTCEG score recompute
  24. 2026-07-05 13:15 UTCGHSA enrichment
  25. 2026-07-05 09:11 UTCEG score recompute
Show 61 more
  1. 2026-07-05 09:10 UTCGHSA enrichment
  2. 2026-07-05 04:56 UTCEG score recompute
  3. 2026-07-05 04:55 UTCGHSA enrichment
  4. 2026-07-05 02:31 UTCEPSS rescore
  5. 2026-07-05 02:30 UTCEPSS rescore
  6. 2026-07-05 00:49 UTCEG score recompute
  7. 2026-07-05 00:49 UTCGHSA enrichment
  8. 2026-07-04 20:45 UTCEG score recompute
  9. 2026-07-04 20:45 UTCGHSA enrichment
  10. 2026-07-04 16:40 UTCEG score recompute
  11. 2026-07-04 16:40 UTCGHSA enrichment
  12. 2026-07-04 12:25 UTCEG score recompute
  13. 2026-07-04 12:25 UTCGHSA enrichment
  14. 2026-07-04 08:21 UTCEG score recompute
  15. 2026-07-04 08:20 UTCGHSA enrichment
  16. 2026-07-04 06:31 UTCEPSS rescore
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-04 04:14 UTCEG score recompute
  19. 2026-07-04 04:14 UTCGHSA enrichment
  20. 2026-07-04 00:08 UTCEG score recompute
  21. 2026-07-04 00:08 UTCGHSA enrichment
  22. 2026-07-03 20:04 UTCEG score recompute
  23. 2026-07-03 20:04 UTCGHSA enrichment
  24. 2026-07-03 15:59 UTCEG score recompute
  25. 2026-07-03 15:59 UTCGHSA enrichment
  26. 2026-07-03 11:55 UTCEG score recompute
  27. 2026-07-03 11:54 UTCGHSA enrichment
  28. 2026-07-03 07:48 UTCEG score recompute
  29. 2026-07-03 07:48 UTCGHSA enrichment
  30. 2026-07-03 03:41 UTCEG score recompute
  31. 2026-07-03 03:41 UTCGHSA enrichment
  32. 2026-07-02 23:32 UTCEG score recompute
  33. 2026-07-02 23:32 UTCGHSA enrichment
  34. 2026-07-02 19:27 UTCEG score recompute
  35. 2026-07-02 19:27 UTCGHSA enrichment
  36. 2026-07-02 15:23 UTCEG score recompute
  37. 2026-07-02 15:23 UTCGHSA enrichment
  38. 2026-07-02 11:18 UTCEG score recompute
  39. 2026-07-02 11:18 UTCGHSA enrichment
  40. 2026-07-02 07:13 UTCEG score recompute
  41. 2026-07-02 07:13 UTCGHSA enrichment
  42. 2026-07-02 03:09 UTCEG score recompute
  43. 2026-07-02 03:09 UTCGHSA enrichment
  44. 2026-07-01 23:05 UTCEG score recompute
  45. 2026-07-01 23:05 UTCGHSA enrichment
  46. 2026-07-01 19:01 UTCEG score recompute
  47. 2026-07-01 19:01 UTCGHSA enrichment
  48. 2026-07-01 15:07 UTCEPSS rescore
  49. 2026-07-01 14:57 UTCEG score recompute
  50. 2026-07-01 14:57 UTCGHSA enrichment
  51. 2026-07-01 10:52 UTCEG score recompute
  52. 2026-07-01 10:52 UTCGHSA enrichment
  53. 2026-07-01 06:48 UTCEG score recompute
  54. 2026-07-01 06:48 UTCGHSA enrichment
  55. 2026-07-01 02:43 UTCEG score recompute
  56. 2026-07-01 02:43 UTCGHSA enrichment
  57. 2026-06-30 22:38 UTCEG score recompute
  58. 2026-06-30 22:38 UTCGHSA enrichment
  59. 2026-06-30 18:33 UTCEG score recompute
  60. 2026-06-30 18:33 UTCGHSA enrichment
  61. 2026-06-30 18:32 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-58172?
CVE-2026-58172 is a critical vulnerability published on June 30, 2026. Ocelot through 24.1.0, fixed in commit f156fd4, contains a security control bypass vulnerability that allows denied clients to circumvent IP-based access restrictions by sending WebSocket upgrade requests. The WebSocket upgrade pipeline branch configured via MapWhen in OcelotPipelineExtensions.cs…
When was CVE-2026-58172 disclosed?
CVE-2026-58172 was first published in the National Vulnerability Database on June 30, 2026, with the most recent update on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58172 actively exploited?
CVE-2026-58172 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-58172?
CVE-2026-58172 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-58172?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58172, 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

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