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Google Chrome CVE-2026-113335

| EUVDEUVD-2026-105580 HIGH
Buffer Overflow (CWE-119)
2026-10-20 chrome-cve-admin@google.com GHSA-89x6-f5vq-m45w
8.8
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 crafted web page
  2. Delivery
    Deliver malicious HTML to browser
  3. Exploit
    Trigger memory corruption in Extensions
  4. Execution
    Execute arbitrary code in sandbox
  5. Impact
    Chain sandbox escape for host impact

Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Bounds checking, buffer size validation
MITRE ATT&CK

2 techniques across 2 tactics: Execution, Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires the victim to actively load attacker-controlled content - the CVSS vector specifies UI:R (user interaction), so the user must visit or render a crafted HTML page in a vulnerable Chrome build before 156.0.8078.47; it is not a no-interaction drive-by against a server. No authentication or prior privilege is needed (PR:N). The primary limiting factor is that code execution is confined to the browser sandbox (per the description), so a standalone exploit cannot reach the underlying OS without being chained to an additional sandbox-escape vulnerability; scope is unchanged (S:U). Any Chrome desktop installation at a version below the fixed build in a default configuration is affected - no special feature or non-default setting is required to be vulnerable.

Impact

The input CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, base 8.8) indicates a network-reachable, low-complexity, unauthenticated memory-corruption flaw requiring only that a victim load a crafted HTML page. However, a key signal conflicts: Google rates the Chromium security severity as Medium, and the description explicitly states code execution occurs INSIDE the sandbox - meaning the flaw alone does not achieve a full host compromise without a separate sandbox-escape, which tempers the 8.8 score. No EPSS score was provided, so exploitation probability cannot be quantified. The vulnerability is NOT listed in CISA KEV and no POC/exploit code is referenced, so there is no evidence of active or public exploitation. Net assessment: patch promptly given Chrome's ubiquity and the low attack complexity, but the sandboxed-execution limitation and Google's Medium rating suggest this is a real-but-not-emergency priority rather than a high-CVSS issue with confirmed mass exploitation. EPSS and real-world exploitation data are missing and should be monitored.

Exploit ScenarioDerived

An attacker hosts or compromises a web page containing crafted HTML that triggers the memory-corruption bug in Chrome's Extensions component when a victim visits it with a vulnerable browser (prior to 156.0.8078.47). Successful exploitation yields arbitrary code execution confined to the renderer/extensions sandbox, which would typically need to be chained with a separate sandbox escape to fully compromise the host. No public proof-of-concept or exploit code is identified at time of analysis.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.4% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 21, 2026

Memory corruption in the Extensions component of Google Chrome builds prior to 156.0.8078.47 lets remote attackers achieve arbitrary code execution inside the browser sandbox when a victim loads a crafted HTML page. The flaw is network-reachable, low-complexity, and unauthenticated (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, base 8.8), with the only meaningful prerequisite being that the user render attacker-controlled content; exploitation is confined to the sandbox and would require chaining to a separate escape to reach the host OS. No public exploit code has been identified and the issue is not recorded as confirmed actively exploited (not in CISA KEV); Chromium rates the issue Medium security severity despite the elevated base score. Fix is available from the vendor in Chrome 156.0.8078.47.

RemediationAI

Vendor-released patch: Chrome 156.0.8078.47 (stable channel). Upgrade every Chrome desktop install to build 156.0.8078.47 or later via the built-in updater (chrome://settings/help), and enforce a minimum-version policy through enterprise update controls or your endpoint management tooling so the fixed build is rolled out fleet-wide; verify post-deployment by checking chrome://version against 156.0.8078.47. Until the upgrade completes, reduce exposure by disabling or removing untrusted extensions (chrome://extensions) and, where operationally acceptable, blocking untrusted sites via policy - noting that these are partial measures because the trigger is a crafted HTML page and the vulnerable code lives in the Extensions subsystem, so they do not eliminate the flaw. Additional hardening such as Chrome's site isolation is enabled by default and should not be disabled, but it is a defense-in-depth layer rather than a fix, and because code execution stays inside the sandbox, pair patching with prompt application of subsequent Chrome sandbox-escape fixes. Vendor advisory: https://chromereleases.googleblog.com/2026/10/stable-channel-update-for-desktop_02018666648.html; tracking bug: https://issues.chromium.org/issues/518055882.

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 class is CWE-119 (improper restriction of operations within the bounds of a memory buffer), manifesting as memory corruption within Chrome's Extensions subsystem - the component that loads, parses, and brokers privileges for installed extensions and the pages they interact with. Because Chrome's multi-process architecture renders untrusted web content in a sandboxed renderer, a memory-safety defect in extension-related handling can be triggered by a crafted HTML page and corrupted state can be turned into code execution, but the resulting code runs with renderer/sandbox privileges rather than OS-level access (Scope: Unchanged). The CVSS vector's UI:R reflects that the attacker cannot trigger the flaw against a server-side target; the victim must actually load or render the malicious page. Chrome desktop installations below the fixed build 156.0.8078.47 in a default configuration are exposed, and EUVD records the affected range as Chrome builds earlier than 156.0.8078.47. Chromium's own severity rating of Medium signals that sandbox confinement materially reduces the practical severity relative to the 8.8 base score.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (google) PRIMARY 8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vuln.today AI 8.8 HIGH

Remote crafted page with no privileges but required user interaction (UI:R); memory corruption yields full code execution in-process, so C/I/A:H, scope unchanged as impact stays within the sandbox.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/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:N/SI:N/SA:N

Primary rating from Vendor (google).

CVSS VectorVendor: google

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

Lifecycle Timeline

3
CVSS changed
Oct 21, 2026 - 00:23 NVD
8.8 (HIGH)
Patch available
Oct 20, 2026 - 23:20 EUVD
CVE Published
Oct 20, 2026 - 22:19 cve.org
HIGH 8.8

DescriptionCVE.org

Memory corruption in Extensions in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

Executive ViewAI

Why It Matters

Google Chrome versions prior to 156.0.8078.47 contain a high-severity memory corruption flaw in the Extensions component that could allow a crafted web page to execute code within the browser sandbox. This affects any employee using Chrome to browse untrusted content, and while no public exploit identified at time of analysis, the broad browser footprint and potential for session or data compromise make patching a management priority.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.4%
Top 68% exploitable
Prevalence
Ubiquitous
Google Chrome is the most widely deployed desktop web browser globally
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 HIGH
CISA KEV No
Public POC No
EPSS 0.4%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
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

44
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +44
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

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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