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Google Chrome CVE-2026-113139

| EUVDEUVD-2026-105600 MEDIUM
Buffer Overflow (CWE-119)
2026-10-20 chrome-cve-admin@google.com GHSA-8gp3-fhw8-9xfr
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
    Lure victim to attacker-controlled page
  2. Delivery
    Serve crafted HTML targeting Autofill
  3. Exploit
    Trigger memory corruption in Autofill
  4. Execution
    Read out-of-bounds sandbox memory
  5. Impact
    Exfiltrate leaked renderer-process data

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 load attacker-controlled content that exercises the Autofill component, and the CVSS UI:R metric confirms user interaction is mandatory - the attack cannot succeed without a user visiting or interacting with a crafted HTML page. No authentication is required (PR:N). Impact is limited to reading memory within the renderer sandbox (S:U, no scope change); this is an information-disclosure primitive, not code execution or sandbox escape, so on its own it does not grant control of the host and would typically need to be chained with a separate sandbox-escape vulnerability for meaningful compromise. Affected builds are Chrome prior to 156.0.8078.47; updated versions are not exploitable.

Impact

This is a genuine but moderate-priority issue, not a top-tier emergency. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N, base 6.5) indicates remote, low-complexity, unauthenticated reach, but exploitation is gated on user interaction (UI:R) and the impact is confidentiality-only (C:H, I:N, A:N) with no scope change (S:U) - meaning the flaw yields a read of memory *inside* the renderer sandbox rather than code execution or sandbox escape. The EPSS score is low (0.22%, 11th percentile), consistent with an info-leak primitive that requires a crafted page and a victim visit rather than a wormable or server-side bug. There is no CISA KEV listing and no POC referenced in the supplied data, so this is 'no public exploit identified at time of analysis.' Signals are largely consistent: a Medium Chromium-rated bug, modest EPSS, no exploitation evidence. One caveat to verify: the description says 'potentially read memory inside the sandbox,' which is more bounded than a full C:H high-confidentiality rating would normally imply - the official C:H may slightly overstate the realistic disclosure scope. Memory-read bugs like this are typically chained with a separate sandbox-escape bug to be dangerous on their own.

Exploit ScenarioDerived

An attacker hosts a malicious web page (or injects crafted HTML into a site the victim visits) that abuses the Autofill component to trigger memory corruption. When a user with a vulnerable Chrome build loads the page and interacts as required, the attacker reads out-of-bounds memory from inside the renderer sandbox, potentially leaking sensitive in-process data such as pointers or credential fragments. No public exploit code was identified in the provided data.

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

Memory corruption in the Autofill component of Google Chrome prior to 156.0.8078.47 lets a remote, unauthenticated attacker read memory beyond intended bounds inside the renderer sandbox by convincing a victim to load a crafted HTML page. Successful exploitation requires user interaction (CVSS UI:R) and yields only information disclosure within the sandbox - confidentiality impact is high but there is no integrity or availability impact, no scope change, and no direct path to host compromise without chaining a separate sandbox escape. No public exploit code has been identified at time of analysis and EPSS is low at 0.22% (11th percentile), though vendor-released patches are available and should be applied as routine hygiene rather than emergency response.

RemediationAI

Vendor-released patch: upgrade Google Chrome to 156.0.8078.47 or later - the stable-channel update is documented at https://chromereleases.googleblog.com/2026/10/stable-channel-update-for-desktop_02018666648.html, and the typical path is to let the browser's auto-updater run and then fully relaunch Chrome (verifying via chrome://settings/help that the version reads 156.0.8078.47 or higher), or to push the fixed build through enterprise software deployment/Chrome Browser Cloud Management. If an immediate fleet-wide upgrade is not possible, reduce exposure by disabling the Autofill feature via the enterprise policies AutofillAddressEnabled and AutofillCreditCardEnabled (set to 0) - this removes the vulnerable parsing path from normal browsing but degrades user productivity and forces manual form entry, so it should be time-boxed until patching completes; because exploitation additionally requires the victim to open attacker-controlled HTML, restricting users from untrusted web content and phishing links provides only partial mitigation and is not a substitute for the update. Downstream Chromium-based browsers should be updated to a build that has merged the corresponding upstream fix, and administrators should monitor the Chromium issue tracker entry (https://issues.chromium.org/issues/536607604) for any change in severity or exploitation status.

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 flaw is classified as CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), consistent with the vendor's 'Buffer Overflow' tagging and the Chromium security severity rating of Medium. The affected surface is Autofill, the Chrome feature that parses page form structures and matches field metadata against stored address and payment profiles, which involves handling attacker-influenced DOM attributes and form field names inside the renderer process. A crafted HTML page can drive that parsing logic into an out-of-bounds read, returning adjacent heap contents to script running in the renderer. Because the disclosure is confined to the renderer's own address space (CVSS S:U, no scope change), this is an information-disclosure primitive rather than a code-execution or sandbox-escape bug; extracted memory is most useful as an ASLR/heap-layout oracle that lowers the difficulty of a follow-on exploit. The CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N vector confirms network delivery, no privileges required, and a mandatory user gesture (the victim must visit or interact with the crafted page), and the description states affected builds are Chrome versions 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

Network-reachable via a crafted page (AV:N/AC:L/PR:N) but requires a user to load it (UI:R); sandboxed read-only disclosure gives C:H, I:N, A:N with no scope change.

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 - 22:19 cve.org
MEDIUM 6.5
CVE Published
Oct 20, 2026 - 22:19 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

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

Threat Intelligence Overview

EPSS Score
0.2%
Top 89% exploitable
Prevalence
Ubiquitous
Google Chrome is one of 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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