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Google Chrome CVE-2026-113120

| EUVDEUVD-2026-105648 HIGH
Improper Input Validation (CWE-20)
2026-10-20 chrome-cve-admin@google.com GHSA-gq3x-77gx-q333
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 malicious site
  2. Exploit
    Serve crafted HTML with malformed media
  3. Execution
    Trigger improper input validation in Media component
  4. Impact
    Execute arbitrary code within renderer sandbox

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 the victim to load attacker-controlled web content in a vulnerable Chrome build (pre-156.0.8078.47) that exercises the Media component's media parsing/playback path - the crafted HTML page is the delivery mechanism and user interaction (UI:R) is mandatory, so there is no fully passive or server-side trigger. A key LIMITING factor is that, per the description, resulting code execution is confined to the renderer sandbox: converting this into host-level compromise requires chaining a separate sandbox-escape vulnerability. Additional limiters: only vulnerable desktop Chrome (and likely Chromium-derived browsers) before the fixed version are affected, and no authentication to the attacker's site is implied beyond the victim visiting it.

Impact

Signals are moderately aligned toward a real but not top-tier priority. The CVSS 3.1 base score of 8.8 (AV:N/AC:L/PR:N/UI:R/S:U) reflects Chrome's standard scoring for a remotely-reachable memory-safety issue requiring only that a user open a page, but it OVERSTATES real-world impact here: the description explicitly states code execution occurs 'inside the sandbox', meaning a full compromise still requires a separate sandbox-escape chain - yet the vector carries C:H/I:H/A:H and S:U, which does not credit that containment. This is why Google itself rates the Chromium security severity only 'Medium' despite the 8.8 NVD number - a notable CVSS-vs-vendor divergence worth flagging. Exploitation status is 'no public exploit identified at time of analysis': the input provides no KEV listing, no POC flag, and no EPSS score, so there is no evidence of active or probable near-term exploitation. Net: patch in the normal Chrome update cycle rather than emergency out-of-band; the inflated 8.8 is driven by the ubiquity/network-vector scoring convention, not by confirmed weaponization, and the sandbox limitation plus required user interaction meaningfully reduce practical risk.

Exploit ScenarioDerived

An attacker hosts a crafted HTML page containing malformed media content and lures a victim running a pre-156.0.8078.47 Chrome build to visit it (phishing link or malvertising). When the page's media is parsed, improper input validation lets the attacker execute arbitrary code within the renderer sandbox; no public exploit code was identified in the provided data, and a further sandbox escape would be needed for host compromise.

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

Remote code execution inside Chrome's renderer sandbox is possible in Google Chrome versions prior to 156.0.8078.47 through crafted HTML that exercises the Media component. The CVSS 3.1 vector is 8.8 (AV:N/AC:L/PR:N/UI:R), so exploitation is remote and unauthenticated but requires the victim to load attacker-controlled content; impact is confined to the sandbox and host compromise would require a separate sandbox escape. Google has released the fixed 156.0.8078.47 build, and no public exploit identified at time of analysis; Chromium rates the issue Medium despite the High CVSS score.

RemediationAI

Update Google Chrome to 156.0.8078.47 or later; vendor-released patch: 156.0.8078.47, per the Stable Channel advisory. After updating, confirm the version via chrome://version and fully restart the browser so the new binary is in use. For managed fleets, force the fixed build through Chrome Enterprise update policies and verify compliance; where immediate patching is not possible, confine browsing of untrusted web content to an updated browser or a disposable/isolated VM because the flaw is exercised through crafted HTML and cannot be reliably disabled by a simple setting. Keep Chrome's renderer sandbox enabled; this limits the impact of successful exploitation but does not remove the flaw. Advisory: https://chromereleases.googleblog.com/2026/10/stable-channel-update-for-desktop_02018666648.html

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

Improper input validation (CWE-20) in Chrome's Media handling means attacker-supplied HTML can reach a code path where untrusted media data is not adequately validated, potentially allowing arbitrary code execution in the renderer sandbox. The affected component is Chrome's in-browser media stack, which parses, demuxes, and decodes media for playback; this is separate from the OS sandbox, so the CVSS impact reflects code execution within the compromised renderer rather than by itself crossing to the host. The vector AV:N/AC:L/PR:N/UI:R matches a web-delivered attack with mandatory user interaction; EUVD and the Chrome Stable Channel advisory identify 156.0.8078.47 as the fix.

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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 needs a victim visit (AV:N/UI:R, PR:N), low complexity; impacts scored high within the renderer per Chrome convention, scope unchanged because code stays inside 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

Improper input validation in Media in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially 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, unauthenticated remote code execution issue in the Media component that is triggered when a user loads crafted HTML, with impact initially confined to Chrome's renderer sandbox. Leadership should care because Chrome is widely deployed across the workforce, but immediate business risk is tempered by the absence of public exploit code at time of analysis and the availability of a fixed vendor build; unpatched endpoints could still become an entry point if combined with a separate sandbox escape.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.4%
Top 72% exploitable
Prevalence
Ubiquitous
Google Chrome is the dominant desktop browser across nearly all environments
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

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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