What is CVE-2026-22779?

CVE-2026-22779 is a medium-severity vulnerability in Neoteroi Blacksheep, classified under HTTP Response Splitting. CVSS score: 5.3/10. Published 2026-01-14.

How severe is CVE-2026-22779?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Neoteroi Blacksheep

CVE-2026-22779

BlackSheep is an asynchronous web framework to build event based web applications with Python. Prior to 2.4.6, the HTTP Client implementation in BlackSheep is vulnerable to CRLF injection. Missing headers validation makes it possible for a…

EPSS: 0.003 (22.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Neoteroi Blacksheep — versions < 2.4.6

Weakness classification (CWE)

CWE-113 — HTTP Response Splitting

References

security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-22779?: CVE-2026-22779 is a medium-severity vulnerability in Neoteroi Blacksheep, classified under HTTP Response Splitting. CVSS score: 5.3/10. Published 2026-01-14.
How severe is CVE-2026-22779?: Medium severity. CVSS v3 base score is 5.3 out of 10.