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CVE-2026-42270

7.5 · HIGH

countly-server is the server-side part of Countly, a product analytics solution.

Published Oct 16, 2026CWE-248EPSS 0.54%

Overview

CVE-2026-42270 is a high-severity vulnerability. It was published on October 16, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/Countly/countly-server/commit/72f19bc5161117fa02a224bf9f7316bf42dae58dGitHubgithub.com/Countly/countly-server/commit/f9ad31480f94ee3ccc0f12708c8804be9c803f95GitHubgithub.com/Countly/countly-server/releases/tag/24.05.50GitHubgithub.com/Countly/countly-server/releases/tag/25.03.44GitHubgithub.com/Countly/countly-server/security/advisories/GHSA-86cv-qwp9-jwp3GitHubgithub.com/Countly/countly-server/security/advisories/GHSA-86cv-qwp9-jwp3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-42270?

CVE-2026-42270 is a high-severity vulnerability. It was published on October 16, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-42270?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-42270?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-42270?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-42270 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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