CVE-2026-42270 (GCVE-0-2026-42270)
Vulnerability from cvelistv5
Published
2026-10-16 16:02
Modified
2026-10-16 16:52
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Summary
countly-server is the server-side part of Countly, a product analytics solution. Prior to 24.05.50 and 25.03.44, star-rating/images/ and dashboards/images/screenshots/ are among public image and screenshot routes using the local fs storage backend that call getStream and pipe filesystem streams to HTTP responses without an error listener. An unauthenticated request containing a URL-encoded dot can make createReadStream open a directory, emit an asynchronous EISDIR error, and terminate the Node.js process as an unhandled exception, allowing repeated requests to keep the analytics API unavailable. The affected routes also include /appimages/*, /memberimages/*, and */screenshots/*. This issue is fixed in versions 24.05.50 and 25.03.44.
References
Impacted products
Vendor Product Version
Countly countly-server Version: < 24.05.50
Version: >= 25.03, < 25.03.44
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42270",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T16:52:07.011789Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-16T16:52:38.647Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/Countly/countly-server/security/advisories/GHSA-86cv-qwp9-jwp3"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "countly-server",
          "vendor": "Countly",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 24.05.50"
            },
            {
              "status": "affected",
              "version": "\u003e= 25.03, \u003c 25.03.44"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "countly-server is the server-side part of Countly, a product analytics solution. Prior to 24.05.50 and 25.03.44, star-rating/images/ and dashboards/images/screenshots/ are among public image and screenshot routes using the local fs storage backend that call getStream and pipe filesystem streams to HTTP responses without an error listener. An unauthenticated request containing a URL-encoded dot can make createReadStream open a directory, emit an asynchronous EISDIR error, and terminate the Node.js process as an unhandled exception, allowing repeated requests to keep the analytics API unavailable. The affected routes also include /appimages/*, /memberimages/*, and */screenshots/*. This issue is fixed in versions 24.05.50 and 25.03.44."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-248",
              "description": "CWE-248: Uncaught Exception",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-16T16:02:00.196Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/Countly/countly-server/security/advisories/GHSA-86cv-qwp9-jwp3",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/Countly/countly-server/security/advisories/GHSA-86cv-qwp9-jwp3"
        },
        {
          "name": "https://github.com/Countly/countly-server/commit/72f19bc5161117fa02a224bf9f7316bf42dae58d",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Countly/countly-server/commit/72f19bc5161117fa02a224bf9f7316bf42dae58d"
        },
        {
          "name": "https://github.com/Countly/countly-server/commit/f9ad31480f94ee3ccc0f12708c8804be9c803f95",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Countly/countly-server/commit/f9ad31480f94ee3ccc0f12708c8804be9c803f95"
        },
        {
          "name": "https://github.com/Countly/countly-server/releases/tag/24.05.50",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Countly/countly-server/releases/tag/24.05.50"
        },
        {
          "name": "https://github.com/Countly/countly-server/releases/tag/25.03.44",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Countly/countly-server/releases/tag/25.03.44"
        }
      ],
      "source": {
        "advisory": "GHSA-86cv-qwp9-jwp3",
        "discovery": "UNKNOWN"
      },
      "title": "countly-server: Unauthenticated Denial of Service (DoS) via Unhandled Stream Exception"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-42270",
    "datePublished": "2026-10-16T16:02:00.196Z",
    "dateReserved": "2026-04-26T11:53:27.707Z",
    "dateUpdated": "2026-10-16T16:52:38.647Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"countly-server: Unauthenticated Denial of Service (DoS) via Unhandled Stream Exception\", \"problemTypes\": [{\"descriptions\": [{\"cweId\": \"CWE-248\", \"lang\": \"en\", \"description\": \"CWE-248: Uncaught Exception\", \"type\": \"CWE\"}]}], \"metrics\": [{\"cvssV3_1\": {\"attackComplexity\": \"LOW\", \"attackVector\": \"NETWORK\", \"availabilityImpact\": \"HIGH\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"scope\": \"UNCHANGED\", \"userInteraction\": \"NONE\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"version\": \"3.1\"}}], \"references\": [{\"name\": \"https://github.com/Countly/countly-server/security/advisories/GHSA-86cv-qwp9-jwp3\", \"tags\": [\"x_refsource_CONFIRM\"], \"url\": \"https://github.com/Countly/countly-server/security/advisories/GHSA-86cv-qwp9-jwp3\"}, {\"name\": \"https://github.com/Countly/countly-server/commit/72f19bc5161117fa02a224bf9f7316bf42dae58d\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/Countly/countly-server/commit/72f19bc5161117fa02a224bf9f7316bf42dae58d\"}, {\"name\": \"https://github.com/Countly/countly-server/commit/f9ad31480f94ee3ccc0f12708c8804be9c803f95\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/Countly/countly-server/commit/f9ad31480f94ee3ccc0f12708c8804be9c803f95\"}, {\"name\": \"https://github.com/Countly/countly-server/releases/tag/24.05.50\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/Countly/countly-server/releases/tag/24.05.50\"}, {\"name\": \"https://github.com/Countly/countly-server/releases/tag/25.03.44\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/Countly/countly-server/releases/tag/25.03.44\"}], \"affected\": [{\"vendor\": \"Countly\", \"product\": \"countly-server\", \"versions\": [{\"version\": \"\u003c 24.05.50\", \"status\": \"affected\"}, {\"version\": \"\u003e= 25.03, \u003c 25.03.44\", \"status\": \"affected\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-10-16T16:02:00.196Z\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"countly-server is the server-side part of Countly, a product analytics solution. Prior to 24.05.50 and 25.03.44, star-rating/images/ and dashboards/images/screenshots/ are among public image and screenshot routes using the local fs storage backend that call getStream and pipe filesystem streams to HTTP responses without an error listener. An unauthenticated request containing a URL-encoded dot can make createReadStream open a directory, emit an asynchronous EISDIR error, and terminate the Node.js process as an unhandled exception, allowing repeated requests to keep the analytics API unavailable. The affected routes also include /appimages/*, /memberimages/*, and */screenshots/*. This issue is fixed in versions 24.05.50 and 25.03.44.\"}], \"source\": {\"advisory\": \"GHSA-86cv-qwp9-jwp3\", \"discovery\": \"UNKNOWN\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-42270\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T16:52:07.011789Z\"}}}], \"references\": [{\"url\": \"https://github.com/Countly/countly-server/security/advisories/GHSA-86cv-qwp9-jwp3\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T16:52:24.452Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-42270\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"GitHub_M\", \"dateReserved\": \"2026-04-26T11:53:27.707Z\", \"datePublished\": \"2026-10-16T16:02:00.196Z\", \"dateUpdated\": \"2026-10-16T16:52:38.647Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.