Vulnerability in Jupyter Jupyter_server
CVE-2026-40110
Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, the Origin header validation uses Python's re.match() to check incoming origins against the allow_origin_pat configuration value. Because re.match(…
EPSS: 0.000 (1.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.
Affected products
- Jupyter Jupyter_server
- Jupyter-server Jupyter_server — versions <= 2.17.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Mitigation, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-40110?
- CVE-2026-40110 is a high-severity vulnerability in Jupyter Jupyter_server, classified under CWE-777. CVSS score: 7.3/10. Published 2026-05-05.
- How severe is CVE-2026-40110?
- High severity. CVSS v3 base score is 7.3 out of 10.