EUVD-2026-66089
GHSA-j4j4-cqmr-hrc4
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Remote crafted page needs user interaction (UI:R) and no auth (PR:N); use-after-free requires a heap race so AC:H; sandbox escape is a scope change (S:C) with full C/I/A impact.
Primary rating from Vendor (Chrome).
CVSS VectorVendor: Chrome
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Sync in Google Chrome on on iOS prior to 152.0.7977.65 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Low)
AnalysisAI
Sandbox-escaping remote code execution is possible in Google Chrome for iOS before 152.0.7977.65, where a use-after-free in the Sync component can be triggered by a victim visiting a crafted HTML page, potentially letting a remote attacker run arbitrary code outside the renderer sandbox. Google has shipped a fixed stable build, and there is no public exploit identified at time of analysis; the flaw is not listed in CISA KEV and SSVC records exploitation status as none. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to open attacker-controlled web content in Google Chrome on iOS at a version below 152.0.7977.65 - the CVSS UI:R metric confirms mandatory user interaction (visiting/rendering a crafted HTML page). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals conflict and should be reconciled before prioritization. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker hosts a crafted HTML page and lures a Chrome-for-iOS user (via phishing link, malvertising, or a compromised site) into opening it; the page drives the Sync code path to free and then reuse a heap object, and with successful heap grooming the attacker corrupts memory to gain code execution outside the browser sandbox. No POC is present in the provided data, and the low-complexity claim in the CVSS vector is optimistic for a use-after-free that in practice requires a reliable heap race. |
| Remediation | Vendor-released patch: update Google Chrome for iOS to 152.0.7977.65 or later via the Apple App Store, as announced in the Chrome stable-channel update (https://chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0256176589.html); enabling automatic App Store updates ensures the fix rolls out without manual action. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, issue urgent security alert to all users and device administrators directing immediate update to Chrome for iOS 152.0.7977.65 or later, and enable automatic update settings. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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