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A vulnerability in the idna.encode() function of the kimi-cli package allows specially crafted inputs to bypass the previous fix for CVE-2024-3651, causing excessive resource consumption and potential denial-of-service. The issue arises from insufficient early rejection of overly long inputs, leading to expensive processing. Versions prior to 3.14 do not implement the improved input length checks. The vulnerability has a medium severity with a CVSS score of 5.3. Official patches are available starting from version 3.14, which implement early input length rejection to mitigate the issue.

CVE-2026-45409 is a denial-of-service vulnerability in the idna.encode() function used by kimi-cli, where specially crafted inputs that exploit the valid_contexto function can cause excessive resource consumption. This issue is a bypass of the previous fix for CVE-2024-3651, as the original remediation did not fully prevent processing of long inputs before length rejection. Starting with version 3.14, idna.encode() rejects long inputs early to minimize resource use, and version 3.15 extends this to other related functions. Without these patches, an attacker can supply arbitrarily large inputs that cause significant processing delays, leading to denial-of-service conditions.

Detailed information about UBUNTU-CVE-2026-45409 affecting null python-pip. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-45409 - Live Threat Intelligence - Threat Radar | OffSeq.com

Kimi cli: Internationalized Domain Names in Applications (IDNA): Specially crafted inputs to idna.encode() can bypass CVE-2024-3651 fix (CVE-2026-45409)

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