CVE-2026-118664

    Dashboard / Vulnerabilities / CVE-2026-118664

    CVE-2026-118664

    Published: 28 Oct 2026Last Modified: 31 Oct 2026

    Summary: decode-uri-component: Denial of service via quadratic replacement of percent-encoded runs

    Details: 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.

    References: https://github.com/SamVerschueren/decode-uri-component/releases/tag/v0.5.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118664.json, https://github.com/SamVerschueren/decode-uri-component/security/advisories/GHSA-qr28-fpjm-wq7f, https://nvd.nist.gov/vuln/detail/CVE-2026-118664, https://github.com/SamVerschueren/decode-uri-component/commit/fad01d65b93bd3f2f0dc32dfd8d57a38b57bc608

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -58ed85f5adc7cfaee5e49e4d52b067f172d0bcb6

    Affected versions

    v0.5.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-118664 | CVE-DB