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CVE-2026-73259

5.4 · MEDIUM

Mongoose is an embedded web server and network library.

Published Aug 20, 2026CWE-79EPSS 0.41%

Overview

CVE-2026-73259 is a medium-severity vulnerability. It was published on August 20, 2026 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Mongoose is an embedded web server and network library. Prior to 7.22, a remote attacker can send a crafted percent-encoded request path to a deployment using MG_ENABLE_DIRLIST and persuade a user to visit it. The mg_http_serve_dir() and listdir() path in src/http.c places the decoded request URI into the title and h1 elements without HTML entity encoding. The resulting reflected cross-site scripting executes in the Mongoose origin and can expose session data or perform actions as the victim. This issue is fixed in version 7.22.

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/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71GitHubgithub.com/cesanta/mongoose/pull/3611GitHubgithub.com/cesanta/mongoose/releases/tag/7.22GitHubgithub.com/cesanta/mongoose/security/advisories/GHSA-9cwm-487w-h25wGitHubgithub.com/cesanta/mongoose/security/advisories/GHSA-9cwm-487w-h25w

How CyberStrike helps

Frequently asked questions

What is CVE-2026-73259?

CVE-2026-73259 is a medium-severity vulnerability. It was published on August 20, 2026 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2026-73259?

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-73259?

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-2026-73259?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-73259 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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