SamVerschueren decode-uri-component up to 0.5.0 index.js decodeUriComponent redos

Summaryinfo

A vulnerability marked as problematic has been reported in SamVerschueren decode-uri-component up to 0.5.0. The impacted element is the function decodeUriComponent of the file index.js. This manipulation causes redos. This vulnerability is registered as CVE-2026-118664. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in SamVerschueren decode-uri-component up to 0.5.0 and classified as problematic. Affected by this vulnerability is the function decodeUriComponent of the file index.js. The manipulation with an unknown input leads to a redos vulnerability. The CWE definition for the vulnerability is CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. As an impact it is known to affect availability. The summary by CVE is:

decode-uri-component provides a more robust alternative to decodeURIComponent. Prior to 0.5.1, decodeUriComponent in index.js falls back to customDecodeURIComponent after native decoding throws, and the fallback collects every distinct percent-encoded run before performing a full-string regular-expression replacement for each entry. Malformed input containing many distinct runs can therefore make both the number of replacements and the scanned input length grow together, causing quadratic CPU consumption and blocking the Node.js event loop; request-body inputs can reach the demonstrated size, while ordinary URL header limits reduce the practical delay. This issue is fixed in version 0.5.1.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-118664 since 10/28/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1449.003 according to MITRE ATT&CK.

Upgrading to version 0.5.1 eliminates this vulnerability.

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Productinfo

Vendor

• SamVerschueren

Name

• decode-uri-component

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5.0

Website

• Product: https://github.com/SamVerschueren/decode-uri-component/

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