Chrome is ubiquitous; an RCE use-after-free in the renderer can lead to widespread user compromise and enterprise impact, warranting broad IT/infosec notification.
CVE-2026-121203
Use-after-free in Chrome Geometry allows RCE via crafted HTML.
Is CVE-2026-121203 being exploited?
Not confirmed. CVE-2026-121203 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-121203?
CVE-2026-121203 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-121203?
Yes. A fix has been recorded for CVE-2026-121203. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-121203 affect?
CVE-2026-121203 affects Google Chrome < 157.0.8103.38, Chrome Desktop (Windows/macOS/Linux). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-121203?
Update Chrome to 157.0.8103.38+ immediately and push endpoints.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution in Chrome's Geometry renderer via crafted HTML, enabling arbitrary code execution in the browser sandbox and potential user compromise.
Immediate action required
- affected< 157.0.8103.38
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
cisa ssvc
- exploitation
- none
- automatable
- no
- technical impact
- total
Assessed by CISA 3 Nov 2026 (SSVC 2.0.3).
timeline
- 3 Nov 2026CISA SSVC assessment: exploitation none
- 3 Nov 2026Published · 1 day later
- 4 Nov 2026CVE record last updated · same day later
- 5 Nov 2026Analysed by vulneraibility.com · 1 day later
- Linkchromereleases.googleblog.com /2026/11/stable-channel-update-for-desktop.html
- Linkissues.chromium.org /issues/571065824
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.