CVE-2026-40110

Published: Mag 06, 2026 Last Modified: Mag 06, 2026

ExploitDB:

Other exploit source:

Google Dorks:

HIGH 7,6

Source: [email protected]

Attack Vector: network

Attack Complexity: low

Privileges Required: none

User Interaction: passive

Confidentiality: N/A

Integrity: N/A

Availability: N/A

Description

AI Translation 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.