CVE-2026-45409

描述

Internationalized Domain Names in Applications (IDNA) for Python provides support for Internationalized Domain Names in Applications (IDNA) and Unicode IDNA Compatibility Processing. In versions prior to 3.15, payloads such as `"\u0660" * N` or `"\u30fb" * N + "\u6f22"` utilize the `valid_contexto` function prior to length rejection, and for high values of `N` will take a long time to process. This is the same issue as CVE-2024-3651, however the original remediation in 2024 was not a complete fix. A specially crafted argument to the `idna.encode()` function could consume significant resources. This may lead to a denial-of-service. Starting in version 3.14, the function rejects long inputs as soon as practicable prior to any further processing to minimize resource consumption. In version 3.15, this approach was extended to lesser used alternate functions (i.e. per-label conversions and codec support). A workaround is available. Domain names cannot exceed 253 characters in length. If this length limit is enforced prior to passing the domain to the `idna.encode()` function, it should no longer consume significant resources. This is triggered by arbitrarily large inputs that would not occur in normal usage, but may be passed to the library assuming there is no preliminary input validation by the higher-level application.

如何修補 CVE-2026-45409

要修補 CVE-2026-45409,請將受影響套件升級到下列已修補版本。

• —未列出修補版本
• —升級至 3.15 或更新版本

CVE-2026-45409 正在被利用嗎?

目前沒有被利用訊號。CVE-2026-45409 既不在 CISA KEV 也沒有最新的 EPSS 分數。

受影響套件(2)

• from 0
• from 0, < 3.15

CVSS 分數

參考連結(4)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-45409
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2026-45409
• PATCHgithub.com/kjd/idna
• WEBgithub.com/kjd/idna/security/advisories/GHSA-65pc-fj4g-8rjx