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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-42270
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-16 16:17:23 UTC
Updated2026-10-16 20:02:37 UTC
Descriptioncountly-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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-248 | CWE-248 CWE-248: Uncaught Exception

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Countly Countly-server affected < 24.05.50 Not specified
CNA Countly Countly-server affected >= 25.03, < 25.03.44 Not specified

References

ReferenceSourceLinkTags
github.com/Countly/countly-server/releases/tag/24.05.50 [email protected] github.com
github.com/Countly/countly-server/commit/72f19bc5161117fa02a224bf9f7316b... [email protected] github.com
github.com/Countly/countly-server/commit/f9ad31480f94ee3ccc0f12708c8804b... [email protected] github.com
github.com/Countly/countly-server/security/advisories/GHSA-86cv-qwp9-jwp3 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/Countly/countly-server/releases/tag/25.03.44 [email protected] github.com
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