Is CVE-2026-42874 actively exploited?

No active exploitation of CVE-2026-42874 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42874 be exploited remotely?

Yes. CVE-2026-42874 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42874?

CVE-2026-42874 has a CVSS score of 3.7 (LOW).

HOME VULNERABILITIESCVE-2026-42874

LOW

CVE-2026-42874

CWE-113Published: May 11, 2026· Updated: May 13, 2026

3.7

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.5th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42874 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.