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

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.…

Read on GitHub Advisory Database

On 10/24/2026, 07:12 AM, GitHub Advisory Database published "undici vulnerable to Subresource Integrity bypass via non-lowercase algorithm tokens" (type: Advisory). Severity is "Medium" (medium). Related technologies: JavaScript / Node.js. CVE: CVE-2026-109841.