## undici vulnerable to Subresource Integrity bypass via non-lowercase algorithm tokens

- 種別: advisory
- 重大度: medium
- 関連技術: nodejs
- CVE: CVE-2026-109841
- 公開日時: 2026-10-23T22:12:57.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-f72v-6w45-q472)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-f72v-6w45-q472

影響: npm:undici >= 7.15.0, < 7.30.1 → 7.30.1, npm:undici >= 8.0.0, < 8.12.2 → 8.12.2
undici's fetch() verifies Subresource Integrity (SRI) metadata by looking up the algorithm token in a lowercase-only set, but the SRI specification defines a valid token by its ASCII-lowercase form. A correct but non-lowercase token such as SHA256-... or Sha256-... is therefore treated as unknown and skipped. When no recognized algorithm remains, undici treats the integrity list as empty and accepts the response, so a server that returns a body different from the pinned digest passes the check.…