undici up to 7.30.1/8.12.3 Subresource Integrity input validation

Summaryinfo

A vulnerability categorized as problematic has been discovered in undici up to 7.30.1/8.12.3. Impacted is an unknown function of the component Subresource Integrity. Such manipulation leads to input validation. This vulnerability is referenced as CVE-2026-120423. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in undici up to 7.30.1/8.12.3. It has been rated as problematic. Affected by this issue is an unknown functionality of the component Subresource Integrity. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is integrity. CVE summarizes:

undici is an HTTP client for Node.js. In versions 7.15.0 through 7.30.1 and 8.0.0 through 8.12.3, fetch verifies Subresource Integrity metadata by splitting the integrity string on a single space, but the SRI grammar separates metadata by ASCII whitespace, which also includes the horizontal tab. An integrity value whose digest is preceded by a tab or other ASCII whitespace is parsed as a single unrecognized token and skipped, and when no recognized algorithm remains undici treats the integrity list as empty and accepts the response, so a server returning a body different from the pinned digest passes the check. An application that pins a response with a valid but whitespace-surrounded SRI value receives attacker-controlled bytes with no integrity error, and the attacker needs only to control the response body, not the integrity metadata. The issue is fixed in undici 7.30.2 and 8.12.4, and users should upgrade to one of those versions or later. As a workaround, supply SRI integrity metadata without surrounding whitespace, using a single space to separate multiple digests.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-120423 since 11/02/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 7.30.2 or 8.12.4 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• undici

Version

• 7.30.0
• 7.30.1
• 8.12.0
• 8.12.1
• 8.12.2
• 8.12.3

CPE 2.3info

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CPE 2.2info

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