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CVE-2026-42874

CVE-2026-42874 · Microdot: HTTP response splitting in Response.set_cookie()

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 3.7 · Low · EPSS 0.2% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • microdot

    Versions
    • < 2.6.1: Affected

    No fix published

  • microdot PyPI

    Versions
    • 0.1.0
    • 0.1.1
    • 0.2.0
    • 0.3.0
    • 0.3.1
    • 0.4.0
    • 0.5.0
    • 0.6.0
    • 0.7.0
    • 0.7.1
    • 0.7.2
    • 0.8.0
    • 0.8.1
    • 0.8.2
    • 0.9.0
    • 1.0.0
    • 1.1.0
    • 1.1.1
    • 1.2.0
    • 1.2.1
    • 1.2.2
    • 1.2.3
    • 1.2.4
    • 1.3.0
    • 1.3.1
    • 1.3.2
    • 1.3.3
    • 1.3.4
    • 2.0.0
    • 2.0.1
    • 2.0.2
    • 2.0.3
    • 2.0.4
    • 2.0.5
    • 2.0.6
    • 2.0.7
    • 2.1.0
    • 2.2.0
    • 2.3.0
    • 2.3.1
    • 2.3.2
    • 2.3.3
    • 2.3.4
    • 2.3.5
    • 2.4.0
    • 2.5.0
    • 2.5.1
    • 2.6.0
    Affected ranges
    • ECOSYSTEM: < 2.6.1

    Update to 2.6.1

Original sources

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