decode-uri-component: Denial of service via exponential decoding of malformed percent-encoded input

中 6.6CVE-2026-45822 · GHSA-vcc3-ghjq-m6fr · 30/06/2026 公開 · 25/10/2026 更新

要点

CVE-2026-45822 は decode-uri-component に影響する深刻度「中」 (CVSS 6.6) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.51%（全脆弱性の 43.3% より高い）。
対処：0.5.0 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
decode-uri-component npm	`< 0.5.0`	`0.5.0`

概要

Impact

An attacker who can supply input to decodeUriComponent() (directly or via a dependency that uses this package on URL/query/path data) can cause excessive CPU usage and application unresponsiveness. This is an availability issue; there is no known memory corruption, data disclosure, or remote code execution impact.

Patches

Upgrade to [email protected].

Workarounds

Limit the size of the input.

NVD の説明

decode-uri-component through 0.4.1 is vulnerable to denial of service. The decode() function splits input on '%' producing N tokens and calls decodeComponents(), exhibiting super-linear parsing time: 200 '%ab' tokens takes approximately 0.7s, 700 tokens approximately 6s, and 1400 tokens approximately 33s. An attacker can cause significant CPU consumption and event-loop blocking via crafted input.