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CVE-2026-40110— jupyter-server CORS origin validation bypass via unanchored regex in allow_origin_pat

AI Predicted 6.5 Difficulty: Easy EPSS 0.34% · P27

Affected Version Matrix 1

VendorProductVersion RangeStatus
jupyter-serverjupyter_server<= 2.17.0affected
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I. Basic Information for CVE-2026-40110

Vulnerability Information
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Vulnerability Title
jupyter-server CORS origin validation bypass via unanchored regex in allow_origin_pat
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-777
Source: CVE Program / CVE List V5
Vulnerability Title
Jupyter Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jupyter Server是Jupyter组织的一款用于为Jupyter Web应用提供后端服务的应用软件。 Jupyter Server 2.17.0及之前版本存在安全漏洞，该漏洞源于Origin标头验证使用re.match仅锚定字符串开头，可能导致绕过CORS源限制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
jupyter-serverjupyter_server <= 2.17.0 -

II. Public POCs for CVE-2026-40110

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III. Intelligence Information for CVE-2026-40110

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Patches & Fixes for CVE-2026-40110 (3)

Vendor Advisories for CVE-2026-40110 (1)

Same Patch Batch · jupyter-server · 2026-05-05 · 4 CVEs total

CVE-2025-61669jupyter_server next parameter open redirect can redirect users to external domains
CVE-2026-35397jupyter-server path traversal allows access to sibling directories sharing root_dir name p
CVE-2026-40934jupyter-server authentication cookies remain valid after password reset due to static cook

IV. Related Vulnerabilities

Same product: jupyter_server
Same vendor: jupyter-server
Same weakness: CWE-777

V. Comments for CVE-2026-40110

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