Advisory record · GHSA-xqc2-xf4c-x3h3

Unauthenticated Remote Code Execution in React Server Components

CVSS 9.5 CriticalCritical

Critical, because:

CVSS score 9.5: 9.0 or more.

Published by the maintainers · not yet reviewed by GitHub. The react/react maintainers published this as a GitHub repository advisory; GitHub’s reviewed advisory replaces it here when it arrives.

Published by the react/react maintainers at 14 Oct 2026, 17:08 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
react-server-dom-parcel	npm	>=19.0.0, <19.0.9 \|\| >=19.1.0, <19.1.10 \|\| >=19.2.0, <19.2.9 \|\| >=19.3.0, <19.3.1	19.0.9, 19.1.10, 19.2.9, 19.3.1
react-server-dom-turbopack	npm	>=19.0.0, <19.0.9 \|\| >=19.1.0, <19.1.10 \|\| >=19.2.0, <19.2.9 \|\| >=19.3.0, <19.3.1	19.0.9, 19.1.10, 19.2.9, 19.3.1
react-server-dom-webpack	npm	>=19.0.0, <19.0.9 \|\| >=19.1.0, <19.1.10 \|\| >=19.2.0, <19.2.9 \|\| >=19.3.0, <19.3.1	19.0.9, 19.1.10, 19.2.9, 19.3.1

Identifiers: GHSA-xqc2-xf4c-x3h3
Published: 14 Oct 2026
Updated: 14 Oct 2026

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.5	Critical	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N	GitHub Advisory Database

CISA KEV Not listed.
EPSS No score.

Timeline

14 Oct 2026, 17:08 UTC Published by the maintainers as a GitHub repository advisory
8 Nov 2026, 20:00 UTC First seen by agentprime

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.