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CVE-2026-42874

3.7 · LOW

Microdot is a minimalistic Python web framework.

Published May 11, 2026CWE-113EPSS 0.34%

Overview

CVE-2026-42874 is a low-severity vulnerability. It was published on May 11, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Microdot is a minimalistic Python web framework. Prior to 2.6.1, the Response.set_cookie() method does not sanitize its string arguments, and in particular will not detect the presence of the \r\n sequence in them. This can be a potential source of header injection attacks. For a header injection attack through this issue to be possible, an attacker must first infiltrate the client (for example through an independent XSS attack), so that it can send malicious information that is destined to be stored in a cookie by the server on behalf of the victim. An attacker that infiltrates one client can only orchestrate a header injection attack for that client, all other clients that were not infiltrated are safe. This vulnerability is fixed in 2.6.1.

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/miguelgrinberg/microdot/blob/main/CHANGES.mdGitHubgithub.com/miguelgrinberg/microdot/commit/99b281b45faef8472410f2d56bfef496dfbd95d5GitHubgithub.com/miguelgrinberg/microdot/security/advisories/GHSA-7wc8-wvc4-m498

How CyberStrike helps

Frequently asked questions

What is CVE-2026-42874?

CVE-2026-42874 is a low-severity vulnerability. It was published on May 11, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

How severe is CVE-2026-42874?

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-42874?

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-2026-42874?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-42874 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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