High 7.5Published Oct 16, 2026

CVE-2026-42270countly-server: Unauthenticated Denial of Service (DoS) via Unhandled Stream Exception

Updated under an hour ago (2026-10-19 07:23 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for countly-server

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-248
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 16, 2026

Affected products

Affected products

Countly countly-server countly:server (from the name)	before 24.05.50; from 25.03, < 25.03.44	CNA record

References

https://github.com/Countly/countly-server/security/advisories/GHSA-86cv-qwp9-jwp3x-refsource-confirm
https://github.com/Countly/countly-server/commit/72f19bc5161117fa02a224bf9f7316bf42dae58dx-refsource-misc
https://github.com/Countly/countly-server/commit/f9ad31480f94ee3ccc0f12708c8804be9c803f95x-refsource-misc
https://github.com/Countly/countly-server/releases/tag/24.05.50x-refsource-misc
https://github.com/Countly/countly-server/releases/tag/25.03.44x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.