What is CVE-2026-42874?

CVE-2026-42874 is a low-severity vulnerability in Miguelgrinberg Microdot, classified under HTTP Response Splitting. CVSS score: 3.7/10. Published 2026-05-11.

How severe is CVE-2026-42874?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in Miguelgrinberg Microdot

CVE-2026-42874

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…

EPSS: 0.001 (16.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Miguelgrinberg Microdot — versions < 2.6.1

Weakness classification (CWE)

CWE-113 — HTTP Response Splitting

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-42874?: CVE-2026-42874 is a low-severity vulnerability in Miguelgrinberg Microdot, classified under HTTP Response Splitting. CVSS score: 3.7/10. Published 2026-05-11.
How severe is CVE-2026-42874?: Low severity. CVSS v3 base score is 3.7 out of 10.