CVE-2026-42270 (GCVE-0-2026-42270)

Vulnerability from cvelistv5 – Published: 2026-10-16 16:02 – Updated: 2026-10-16 16:52
VLAI
Title
countly-server: Unauthenticated Denial of Service (DoS) via Unhandled Stream Exception
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 16:52 UTC
CWE
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7730 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Countly countly-server Affected: < 24.05.50
Affected: >= 25.03, < 25.03.44
guessed 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": {
    "epss": {
      "cve": "CVE-2026-42270",
      "date": "2026-10-17",
      "epss": "0.00542",
      "percentile": "0.44343"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "countly-server",
                "vendor": "Countly",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 24.05.50"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 25.03, \u003c 25.03.44"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-42270",
        "lastModified": "2026-10-16T20:02:37.630",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "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"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-42270",
                "options": [
                  {
                    "exploitation": "poc"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T16:52:07.011789Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-10-16T16:17:23.940",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/Countly/countly-server/commit/72f19bc5161117fa02a224bf9f7316bf42dae58d"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/Countly/countly-server/commit/f9ad31480f94ee3ccc0f12708c8804be9c803f95"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/Countly/countly-server/releases/tag/24.05.50"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/Countly/countly-server/releases/tag/25.03.44"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/Countly/countly-server/security/advisories/GHSA-86cv-qwp9-jwp3"
          },
          {
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "url": "https://github.com/Countly/countly-server/security/advisories/GHSA-86cv-qwp9-jwp3"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Awaiting Analysis",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-248"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "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": "2026-10-16T16:52:24.452Z",
              "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"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.