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Google Chrome CVE-2026-113328

| EUVDEUVD-2026-105579 CRITICAL
Improper Input Validation (CWE-20)
2026-10-20 chrome-cve-admin@google.com GHSA-qg3j-rm3j-xcmp
9.6
CVSS 3.1 · Vendor: google
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Lure victim to malicious site
  2. Delivery
    Serve crafted HTML page
  3. Exploit
    Trigger improper input validation in Privacy component
  4. Execution
    Escape Chrome renderer sandbox
  5. Impact
    Execute arbitrary code on host

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Input validation, allowlisting
Exploitation Conditions

Exploitation requires a user to open attacker-controlled content in Chrome - the CVSS UI:R and the description's 'via a crafted HTML page' confirm victim interaction (visiting/rendering a malicious page) is mandatory; it cannot be triggered without this. No authentication is required (PR:N). The flaw lies in the Privacy component's input validation and results in code execution outside the sandbox (S:C scope change), meaning successful exploitation breaches the renderer sandbox boundary to affect the host. LIMITING FACTORS: the required user interaction, the need to deliver crafted HTML to the target, dependence on a vulnerable version (before 156.0.8078.47), and the vendor's own Medium severity rating suggesting exploitation may be less reliable than the Critical base score implies.

Impact

The provided CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H, base 9.6 Critical) describes a network-reachable, low-complexity, unauthenticated sandbox-escape RCE requiring only that a victim open a crafted HTML page. That signal points to high real-world risk. However, there is a notable conflict: Google/Chromium rates this issue 'Medium' severity, while NVD-style scoring yields 9.6 Critical - STATE EXPLICITLY that the vendor's own severity rating (Medium) is substantially lower than the 9.6 CVSS, likely because the description qualifies impact as 'potentially execute arbitrary code' (not confirmed reliable exploitation) and may reflect mitigations or difficulty not captured in the base vector. No EPSS score, CISA KEV listing, or public POC was provided in the input, so exploitation probability cannot be quantified and there is no public exploit identified at time of analysis. Net assessment: patch promptly given Chrome's ubiquity and the sandbox-escape class, but the absence of KEV/POC/EPSS and the vendor's Medium rating suggest this is not currently confirmed as actively exploited - treat as a high-priority patch driven by product footprint rather than confirmed in-the-wild activity.

Exploit ScenarioDerived

An attacker hosts a malicious web page (or injects crafted HTML into a compromised/advertising site) and lures a Chrome user to visit it. The crafted HTML triggers improper input validation in the Privacy component, allowing code execution to escape the renderer sandbox and run on the victim's host. No public exploit code was identified in the provided data, and user interaction (visiting the page) is required.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.
Patch available 0.4% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 21, 2026

Sandbox escape and code execution in Google Chrome's Privacy component allows remote attackers to run arbitrary code outside the browser sandbox when a victim renders a crafted HTML page, affecting all Chrome builds prior to 156.0.8078.47. Exploitation requires user interaction (CVSS UI:R) and no authentication (PR:N), yet the resulting scope change (S:C) lets a renderer-level flaw compromise the host - Google rates it Chromium security severity Medium, suggesting lower exploit reliability than the 9.6 base score implies. No public exploit code or CISA KEV listing was identified at time of analysis, and a vendor patch is available.

RemediationAI

Upgrade Google Chrome to 156.0.8078.47 or later on every managed endpoint - vendor-released patch: 156.0.8078.47 - as documented in the Chrome stable channel advisory at https://chromereleases.googleblog.com/2026/10/stable-channel-update-for-desktop_02018666648.html (also mirrored in EUVD record EUVD-2026-105579). Because exploitation is triggered by rendering a crafted HTML page, interim compensating controls should focus on reducing the attack surface and exposure window: enforce browser auto-update or push the build via your endpoint management tool and verify version reporting, since users who postpone restart remain on vulnerable binaries; restrict or block access to untrusted web content for high-value users and place strict egress filtering in front of browsing (trade-off: reduced web usability and a maintenance burden on allowlists); enable Chrome site isolation and keep it enforced rather than disabling it for legacy apps (trade-off: higher memory consumption); and consider running high-risk browsing in a disposable or remote-isolated browser session so a sandbox escape lands in a contained environment (trade-off: latency and infrastructure cost). Note that no public exploit code was identified at time of analysis, so prioritization should be driven by the unpatched-version population rather than active exploitation reporting.

Affected VersionsENISA

Chrome 156.0.8078.47 <156.0.8078.47

Affected Packages

euvd chrome fix: 156.0.8078.47

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The root cause is improper input validation (CWE-20) in Chrome's Privacy component, a subsystem that handles user-facing privacy controls and the browser-side processing of page-supplied data. Where validation of attacker-controlled input is missing or incomplete, a crafted HTML page can drive the Privacy component into an unexpected state; because the resulting CVSS scope is Changed (S:C), the corruption crosses the renderer sandbox boundary and yields code execution with the browser process's privileges rather than remaining confined to the isolated renderer. The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H reflects network delivery of the malicious page, no privileges required, mandatory victim interaction, and high confidentiality, integrity, and availability impact on the host. Google's Medium Chromium severity rating, despite the Critical base score, indicates the vendor judges real-world exploitability and reliability to be limited, likely because the sandbox escape primitive must be chained out of the renderer and depends on reliably reaching the flawed validation path.

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Severity by source

Vendor (google) PRIMARY 9.6 CRITICAL
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
vuln.today AI 9.6 CRITICAL

Remote crafted HTML page (AV:N, AC:L, PR:N), victim must open the page (UI:R), and code execution outside the sandbox crosses the security boundary (S:C) with full host compromise (C/I/A:H).

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Primary rating from Vendor (google).

CVSS VectorVendor: google

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
CVSS changed
Oct 21, 2026 - 01:23 NVD
9.6 (CRITICAL)
Patch available
Oct 20, 2026 - 23:20 EUVD
CVE Published
Oct 20, 2026 - 22:19 cve.org
CRITICAL 9.6

DescriptionCVE.org

Improper input validation in Privacy in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

Executive ViewAI

Why It Matters

Google Chrome builds prior to 156.0.8078.47 contain a critical sandbox-escape and code-execution flaw that could allow a crafted web page to compromise the host when a user interacts with it. The issue affects the broader browser fleet and creates endpoint compromise, data exposure, and operational disruption risk, so leadership should treat patch deployment as an urgent priority. No public exploit was identified at time of analysis, but a vendor fix is available.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.4%
Top 63% exploitable
Prevalence
Ubiquitous
Google Chrome is among the most widely deployed browsers worldwide
Data Quality
4 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS 0.4%
Patch available Yes
Active threat No
Deciding rule
CRITICAL severity
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact
High

Priority Score

48
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +48
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

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