Upstream information

CVE-2026-40110 at MITRE

Description

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.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having important severity.

CVSS v3 Scores
CVSS detail National Vulnerability Database
Base Score 7.3
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction Required
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact None
CVSSv3 Version 3.1
CVSS v4 Scores
CVSS detail CNA (GitHub)
Base Score 7.6
Vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Attack Requirements Present
Privileges Required None
User Interaction Passive
Vulnerable System Confidentiality Impact High
Vulnerable System Integrity Impact High
Vulnerable System Availability Impact Low
Subsequent System Confidentiality Impact Low
Subsequent System Integrity Impact Low
Subsequent System Availability Impact Low
CVSSv4 Version 4.0
SUSE Bugzilla entry: 1264213 [NEW]

No SUSE Security Announcements cross referenced.

List of released packages

Product(s) Fixed package version(s) References
openSUSE Tumbleweed
  • python311-jupyter-server >= 2.18.1-1.1
  • python311-jupyter-server-test >= 2.18.1-1.1
  • python313-jupyter-server >= 2.18.1-1.1
  • python313-jupyter-server-test >= 2.18.1-1.1
  • python314-jupyter-server >= 2.18.1-1.1
  • python314-jupyter-server-test >= 2.18.1-1.1
 Patchnames:
openSUSE-Tumbleweed-2026-10710

SUSE Timeline for this CVE

CVE page created: Wed May 6 02:00:45 2026
CVE page last modified: Mon May 11 19:57:07 2026