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A flaw in Node.js 20's HTTP parser allows improper termination of HTTP/1 headers using `\r\n\rX` instead of the required `\r\n\r\n`. This inconsistency enables request smuggling, allowing attackers to bypass proxy-based access controls and submit unauthorized requests. The issue was resolved by upgrading `llhttp` to version 9, which enforces correct header termination. Impact: * This vulnerability affects only Node.js 20.x users prior to the `llhttp` v9 upgrade.

🗓️ 04 Sep 2025 07:32:59Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 2 Views

CVE-2025-23167 vulnerability in Microsoft products.

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02 Jun 2026 08:40Current
6.9Medium risk
Vulners AI Score6.9
CVSS 36.5
CVSS 3.16.5
EPSS0.00096
SSVC
2