CVE-2026-103630
CRITICAL 9.6Use after free in FedCM in Google Chrome prior to 154.0.8037.97 allowed a remote attacker to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)
Severe if exploited (CVSS 9.6), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.3%chance of exploitation in 30 days · 25th percentile
Impact if exploited
9.6CVSS 3.1 · CRITICAL
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ⚠User interaction: A user must take an action (click / open a file)
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.
Data snapshot:
Weakness (CWE)
- CWE-416: Use after free
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
References and research data (JSON)
Vendor product assessments
All currently supported Red Hat products · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
Red Hat · CVE-2026-103630 · Updated 2026-10-07T20:22:54+00:00
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Chrome | < 154.0.8037.97 |
All CVSS metrics
- CRITICAL 9.6 v3.1 · ADP Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H - CRITICAL 9.6 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
References
Advisories
- https://chromereleases.googleblog.com/2026/10/stable-channel-update-for-desktop.html CVE record · Chrome · Updated 2026-10-02T16:07:54.904Z
NVD · CVE-2026-103630 · Updated 2026-10-06T16:22:17.147
Red Hat · CVE-2026-103630 · Updated 2026-10-07T20:22:54+00:00 - https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103630.json Red Hat · CVE-2026-103630 · Updated 2026-10-07T20:22:54+00:00
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-91709 EUVD · EUVD-2026-91709
Technical & other
- https://issues.chromium.org/issues/557323166 CVE record · Chrome · Updated 2026-10-02T16:07:54.904Z
NVD · CVE-2026-103630 · Updated 2026-10-06T16:22:17.147
Red Hat · CVE-2026-103630 · Updated 2026-10-07T20:22:54+00:00 - https://access.redhat.com/security/cve/CVE-2026-103630 Red Hat · CVE-2026-103630 · Updated 2026-10-07T20:22:54+00:00
- https://www.cve.org/CVERecord?id=CVE-2026-103630 Red Hat · CVE-2026-103630 · Updated 2026-10-07T20:22:54+00:00
- https://nvd.nist.gov/vuln/detail/CVE-2026-103630 Red Hat · CVE-2026-103630 · Updated 2026-10-07T20:22:54+00:00