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Description

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**.

PUBLISHED Reserved 2026-05-26 | Published 2026-06-22 | Updated 2026-06-22 | Assigner hackerone




LOW: 3.7CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Problem types

CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

Product status

Default status
unaffected

22.22.3 (semver)
affected

24.16.0 (semver)
affected

26.3.0 (semver)
affected

References

jdstaerk.substack.com/p/nodejs-security-fix-silently-broke

github.com/nodejs/node/issues/63989

nodejs.org/en/blog/vulnerability/june-2026-security-releases

cve.org (CVE-2026-48931)

nvd.nist.gov (CVE-2026-48931)

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