CVE-2026-48931

Summary

A flaw in Node.js HTTP Agent can cause a client to accept as valid a response that is send before the client has sent the request. This vulnerability affects all supported release lines: **Node.js 22**, **Node.js 24**, and **Node.js 26**.

Impact & exploitability

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Additional information

• NVD record
• https://nodejs.org/en/blog/vulnerability/june-2026-security-releasesAdvisory
• https://jdstaerk.substack.com/p/nodejs-security-fix-silently-brokeAdvisory
• https://github.com/nodejs/node/issues/63989Advisory