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() only anchors at the start of the string and does not require a full match, a pattern intended to match only a trusted domain (e.g., trusted.example.com) will also match any origin that begins with that domain followed by additional characters (e.g., trusted.example.com.evil.com). An attacker who controls such a domain can bypass the CORS origin restriction and make cross-origin requests to the Jupyter Server API from an untrusted site. This issue has been fixed in version 2.18.0.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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() only anchors at the start of the string and does not require a
    full match, a pattern intended to match only a trusted domain (e.g., trusted.example.com) will also match
    any origin that begins with that domain followed by additional characters (e.g.,
    trusted.example.com.evil.com). An attacker who controls such a domain can bypass the CORS origin
    restriction and make cross-origin requests to the Jupyter Server API from an untrusted site. This issue
    has been fixed in version 2.18.0. (CVE-2026-40110)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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() only anchors at the start of the string and does not require a     full match, a pattern intended to match only a trusted domain (e.g., trusted.example.com) will also match     any origin that begins with that domain followed by additional characters (e.g.,     trusted.example.com.evil.com). An attacker who controls such a domain can bypass the CORS origin     restriction and make cross-origin requests to the Jupyter Server API from an untrusted site. This issue     has been fixed in version 2.18.0. (CVE-2026-40110)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
441546	SCA: security update for jupyter-server (GHSA-24qx-w28j-9m6p)	Tenable Cloud Security	SCA Checks	high
441546	SCA: security update for jupyter-server (GHSA-24qx-w28j-9m6p)	Tenable Self-Hosted Container Security	SCA Checks	high
312614	Linux Distros Unpatched Vulnerability : CVE-2026-40110	Nessus	Misc.	high

Detections

Analytics

CVE-2026-40110

high

Tenable Plugins

high

high

high