Vulnerability-Lookup

GHSA-WC9Q-87F2-4983

Vulnerability from github – Published: 2026-06-30 18:31 – Updated: 2026-06-30 18:31

Details

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.

Severity

9.1 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

9.3 (Critical)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-58172"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-288"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-30T17:16:24Z",
    "severity": "CRITICAL"
  },
  "details": "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.",
  "id": "GHSA-wc9q-87f2-4983",
  "modified": "2026-06-30T18:31:39Z",
  "published": "2026-06-30T18:31:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58172"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ThreeMammals/Ocelot/issues/2403"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ThreeMammals/Ocelot/pull/2406"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ThreeMammals/Ocelot/commit/f156fd4017ca25025fffdad8ec56c1d657dfb402"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/ocelot-ip-allow-block-list-bypass-for-websocket-upgrade-requests"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-58172 (GCVE-0-2026-58172)

Vulnerability from cvelistv5 – Published: 2026-06-30 15:54 – Updated: 2026-07-02 13:40 X_Open Source

Title

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

Summary

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

9.3 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-288 - Authentication Bypass Using an Alternate Path or Channel

Assigner

VulnCheck

References

4 references

URL	Tags
https://github.com/ThreeMammals/Ocelot/issues/2403	technical-descriptionexploit
https://github.com/ThreeMammals/Ocelot/pull/2406	issue-tracking
https://github.com/ThreeMammals/Ocelot/commit/f15…	patch
https://www.vulncheck.com/advisories/ocelot-ip-al…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
ThreeMammals	Ocelot	Affected: 0 , ≤ 24.1.0 (semver) Unaffected: f156fd4017ca25025fffdad8ec56c1d657dfb402 (git)

Date Public

2026-06-27 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-58172",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-02T03:56:10.595991Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Ocelot",
          "repo": "https://github.com/ThreeMammals/Ocelot",
          "vendor": "ThreeMammals",
          "versions": [
            {
              "lessThanOrEqual": "24.1.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
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      "credits": [
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        }
      ],
      "metrics": [
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            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
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            "subAvailabilityImpact": "NONE",
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      "tags": [
        "x_open-source"
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    "datePublished": "2026-06-30T15:54:59.466Z",
    "dateReserved": "2026-06-29T16:03:38.521Z",
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    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-WC9Q-87F2-4983

CVE-2026-58172 (GCVE-0-2026-58172)

Tags

Sightings

Nomenclature