Event Monitor Cyber
EM-20261110-PA7K VulnerabilityCritical severity

Critical React Vulnerability (CVE-2026-126187)

CVE-2026-126187

Share
Status
Developing

Since : signals keep joining.

First Signal
Nov 10 22:44 UTCC26 GitHub Advisory Database
Page Born
Nov 10 23:17 UTCsecond source joined
Last Signal
Nov 10 23:17 UTC2 hours before snapshot
Sources
20 official · 2 research, news or crowd
Open For
41 minso far

Life Of This Page

  1. 1
    Born
    A second, independent source names it.
  2. 2
    Developing · Now
    New signals join; severity can move.
  3. 3
    Confirmed
    Not yet
    CISA KEV lists it, or exploitation in the wild is reported.
  4. 4
    Resolved
    Not yet
    Past the fix deadline and 14 days with no new signal.
  5. 5
    Archived
    Not yet
    30 days after resolved. Read only; the link keeps working. Reopens if it comes back.

The ID never changes, and earlier addresses keep working. A correction is logged, never overwritten. If two pages turn out to be one incident, the later one points to the earlier.

Vulnerability Lifecycle

  1. Disclosed: reached
    Nov 10 23:17 UTC
    C6 NVD published
  2. Scored: reached
    Nov 10 23:17 UTC
    CVSS 9.5
  3. Exploited: not yet
    Not yet
    No exploitation reported
  4. Advisories: not yet
    Not yet
    None yet
  5. Vendor Response: not yet
    Not yet
    None in sources yet
  6. Resolved: not yet
    Not yet
    After 14 quiet days

Timeline

18:0020:0022:00Nov 11BornC26 GitHub Advisory DatabaseC6 NVD CVE API 2.0

Point at a mark to read it. Squares are signals, colored by severity; every one is also listed under Signals.

Signals

  1. CVE-2026-126187 (CVSS 9.5) (opens source in a new tab) React is a JavaScript library for building user interfaces. From 19.0.0 until 19.0.9, 19.1.10, 19.2.9, and 19.3.1, the react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack packages are… Crit severityDatabaseC6 NVD CVE API 2.0
  2. GHSA-xqc2-xf4c-x3h3 / CVE-2026-126187: React: Unauthenticated Remote Code Execution in React Server Components (opens source in a new tab) npm:react-server-dom-parcel, npm:react-server-dom-parcel, npm:react-server-dom-parcel, npm:react-server-dom-parcel, npm:react-server-dom-turbopack, npm:react-server-dom-turbopack, npm:react-server-dom-turbopack… Crit severityDatabaseC26 GitHub Advisory Database