PatchTheCVECVE-2026-121257: Use after free in TabStrip in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially ex
CVE-2026-121257 is a critical-severity flaw (CVSS 9.6) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Use after free in TabStrip in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted Chrome extension. (Chromium security severity: Medium)
Why this priority
- Critical severity
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 9.6 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.2% (top 89%) |
| CISA exploited list | No |
| Weakness | CWE-416 |
| Published | 2026-11-03 |
| Last modified | 2026-11-05 |
Last updated 2026-11-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Timeline
- Published CVE record published
- Updated Record last modified
Advisories and coverage
Research and news
- VulDB Recent Entries: CVE-2026-121257 | Google Chrome up to 156.0.8078.79 TabStrip use after free 2026-11-03
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-121257?
No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.
Is CVE-2026-121257 being exploited?
CVE-2026-121257 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-121257 affect?
CVE-2026-121257 affects affected software. Severity is critical (CVSS 9.6). Use after free in TabStrip in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted Chrome extension. (Chromium security severity: Medium)
How urgent is CVE-2026-121257?
Priority 36/100. Critical severity
Software pages
Google Chrome vulnerabilities · Chromium vulnerabilities