EUVD-2026-39043
GHSA-p9w8-5hg8-pp9p
Severity by source
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Remotely delivered via extension (AV:N, PR:N) but requires a user-installed malicious extension (UI:R) and unreliable heap grooming (AC:H), yielding total in-process impact (C/I/A:H).
Primary rating from Vendor (Chrome).
CVSS VectorVendor: Chrome
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionCVE.org
Use after free in Web Authentication in Google Chrome prior to 149.0.7827.197 allowed an attacker who convinced a user to install a malicious extension to potentially exploit heap corruption via a crafted Chrome Extension. (Chromium security severity: High)
AnalysisAI
Heap corruption in Google Chrome's Web Authentication (WebAuthn) component affects all desktop builds prior to 149.0.7827.197, where a use-after-free (CWE-416) can be triggered by a malicious browser extension. An attacker who first convinces a victim to install a crafted extension can reach the freed object and potentially achieve code execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to first get a malicious Chrome extension installed by the victim - that user-driven install is the explicit precondition (UI:R) and the primary limiting factor. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are consistent and point to a genuine but conditioned risk rather than a mass-exploitation emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker publishes or sideloads a seemingly benign Chrome extension and uses social engineering (a fake productivity tool, a phishing lure, or a compromised developer account) to convince a target to install it. Once active, the extension issues a crafted sequence of Web Authentication API calls that frees and then reuses an object, corrupting the heap to gain control over execution within Chrome. … |
| Remediation | Vendor-released patch: update Google Chrome to 149.0.7827.197 or later via the stable desktop channel; the fix is available per the Chrome release advisory at https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_0482630350.html (Chromium issue https://issues.chromium.org/issues/521495992). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Alert IT and Chrome users of the vulnerability and the available patch. …
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Same weakness CWE-416 – Use After Free
View allSame technique Memory Corruption
View allVendor StatusVendor
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External POC / Exploit Code
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