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Google Chrome CVE-2026-113066

| EUVDEUVD-2026-105744 MEDIUM
Buffer Overflow (CWE-119)
2026-10-20 chrome-cve-admin@google.com GHSA-mhf4-vcq9-8vw9
6.5
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
    Host crafted HTML page with malformed font
  2. Exploit
    Lure victim to visit page
  3. Execution
    Trigger out-of-bounds read in font parser
  4. Impact
    Leak renderer memory inside sandbox

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 use an affected Chrome desktop build (prior to 156.0.8078.47) and to load attacker-controlled HTML containing a crafted/malformed font that reaches the vulnerable font-parsing code path - this is the default rendering behavior, so no special configuration is needed, but the UI:R requirement means the user must actively navigate to or be lured to the malicious page. The primary limiting factors are the mandatory user interaction and that the disclosure is confined to memory inside the renderer sandbox (no integrity, availability, or sandbox-escape impact), reducing realistic severity to an information leak rather than code execution.

Impact

Signals are largely consistent and point to a moderate, non-urgent issue. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N) describes a network-reachable, low-complexity, unauthenticated flaw that requires user interaction (visiting a crafted page) and yields high confidentiality impact but no integrity or availability impact - matching the description of an attacker reading memory inside the renderer sandbox. Crucially, Google/Chromium rated the security severity 'Low,' which tempers the 6.5 (Medium) base score: the leak is confined inside the sandbox rather than a sandbox escape or RCE. EPSS is low at 0.22% (12th percentile), there is no CISA KEV listing and no public exploit identified, so there is no evidence of active exploitation. The one tension worth noting: CVSS confidentiality is scored C:H while the vendor's own severity is Low and the impact is an in-sandbox memory read, so the real-world information-disclosure value is likely lower than C:H alone implies - verify the sensitivity of readable memory before prioritizing. Overall this is a routine browser patch-cycle item, not an emergency.

Exploit ScenarioDerived

An attacker hosts or compromises a web page containing a malformed font that triggers the memory-corruption bug in Chrome's font handling when a victim browses to it. The out-of-bounds read discloses adjacent renderer-process memory to the attacker-controlled page, potentially leaking data from within the sandbox. No public exploit code has been identified, and successful attack requires the victim to load the crafted page.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 21, 2026

Information disclosure in Google Chrome's font handling allows a remote, unauthenticated attacker to read memory inside the renderer sandbox by convincing a victim to load a crafted HTML page containing a malformed font. All desktop Chrome builds prior to 156.0.8078.47 are affected, and because font parsing is part of normal page rendering, no special configuration is required beyond the victim visiting the attacker's page (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N). There is no public exploit code identified at time of analysis and the flaw is not in CISA KEV; EPSS is 0.22% (12th percentile), consistent with a low-urgency, sandbox-confined memory leak that Google itself rated Low severity.

RemediationAI

Vendor-released patch: Chrome 156.0.8078.47. Update through the normal auto-update channel (Settings > About Chrome) or by deploying the vendor package, then confirm the reported build in chrome://version is 156.0.8078.47 or later; enterprise fleets should push the version via their patch-management or Chrome Browser Cloud Management policy rather than relying on user-initiated updates. See the stable channel advisory at https://chromereleases.googleblog.com/2026/10/stable-channel-update-for-desktop_02018666648.html for the release notes and https://issues.chromium.org/issues/562223550 for the restricted bug. No configuration-level fix exists for the font parser, so interim measures are compensating only: keeping site isolation enabled limits the blast radius of any renderer memory disclosure, and restricting browsing to trusted sites or blocking untrusted downloads reduces exposure to attacker-supplied fonts, though both trade off usability. Disabling web fonts entirely (for example via browser font settings or an extension-level content policy) would remove the primary attack vector but breaks typography on many legitimate sites and is not practical for general users. Because exploitation requires the victim to open a crafted page and the leak is confined to the renderer sandbox, no emergency workaround is warranted beyond prioritized patching; update any Chromium-derived browsers once their vendors ship the corresponding rebase.

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 CWE-119 (improper restriction of operations within the bounds of a memory buffer) in Chrome's font-parsing stack, which in modern Chromium spans the FreeType rasterizer and Skia/OpenType handling reached whenever a page supplies a web font or the browser processes a system font. A maliciously crafted font table causes an out-of-bounds read, letting the renderer disclose bytes of adjacent heap memory rather than crash or execute code. The scope change is not present (S:U) and the impact is confidentiality only (C:H/I:N/A:N), meaning the data exposed lives within the renderer's sandboxed address space; extracting it usefully would require a second-stage sandbox escape vulnerability. Google's advisory classifies the issue as Chromium security severity Low, and the credited reporter channel is the Chrome CVE administrative alias, with technical detail tracked in Chromium issue 562223550. EUVD (EUVD-2026-105744) mirrors the affected range as builds earlier than 156.0.8078.47.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (google) PRIMARY 6.5 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
vuln.today AI 6.5 MEDIUM

Remote crafted page with no auth (AV:N/PR:N) but requires the victim to load it (UI:R); an out-of-bounds read yields confidentiality impact only (C:H, I:N, A:N).

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/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
None
Availability
None

Lifecycle Timeline

4
CVSS changed
Oct 21, 2026 - 16:54 NVD
6.5 (MEDIUM)
Patch available
Oct 20, 2026 - 23:20 EUVD
CVE Published
Oct 20, 2026 - 22:18 cve.org
MEDIUM 6.5
CVE Published
Oct 20, 2026 - 22:18 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Memory corruption in Fonts in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to read memory inside the sandbox via a crafted HTML page. (Chromium security severity: Low)

Threat Intelligence Overview

EPSS Score
0.2%
Top 88% 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 MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
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· derived
High

Priority Score

32
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +32
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.

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