# CVE-2026-121257

Use-after-free in Chrome TabStrip allows RCE via crafted extension

- Page: https://www.vulneraibility.com/cve/CVE-2026-121257
- CVSS: 9.6
- Known exploited: not in CISA KEV as of our last sync
- CISA SSVC: exploitation none, automatable no, technical impact total (assessed 2026-11-04)
- Weakness: CWE-416
- Published: 2026-11-03

## Affected versions

- Google Chrome: affected < 157.0.8103.38

A version outside these ranges is not a statement that it is unaffected.

## Impact

Remote code execution outside the sandbox via a crafted Chrome extension, enabling full host compromise and arbitrary code execution.

## Action

Immediate action required

## Recommendation

Update Chrome to 157.0.8103.38+ and restrict/uninstall untrusted extensions

## References

- [other] https://chromereleases.googleblog.com/2026/11/stable-channel-update-for-desktop.html
- [other] https://issues.chromium.org/issues/567672825

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.