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Google Chrome EUVDEUVD-2026-93600

| CVE-2026-106394 MEDIUM
Incomplete Cleanup (CWE-459)
2026-10-06 Chrome GHSA-w9rp-f824-3x85
4.3
CVSS 3.1 · Vendor: Chrome
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Attack ChainAIDerived

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

  1. Access
    Lure victim to crafted HTML page
  2. Exploit
    Page abuses incomplete cleanup in Glic
  3. Execution
    Read residual cross-origin data
  4. Impact
    Exfiltrate leaked data to attacker

Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Incomplete cleanup
Exploitation Conditions

Exploitation requires the victim to be running a Google Chrome version prior to 155.0.8059.39 and, via social engineering, to actively visit an attacker-controlled crafted HTML page that triggers the Glic component (Chrome's integrated AI/Gemini assistant feature); the incomplete-cleanup flaw (CWE-459) then leaks data from another origin. Key limiting factors: mandatory user interaction (UI:R) - the attack cannot fire without the victim navigating to the malicious page - and the impact being confined to low-sensitivity cross-origin read access (C:L, no integrity or availability impact). The bug is not automatable per SSVC, so drive-by mass exploitation is impractical, and it is already remediated in the stable channel.

Impact

This is a low-priority, low-real-risk issue despite its network attack vector. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N, base 4.3) shows that although the attack is remote and unauthenticated with low complexity, it requires user interaction and yields only low confidentiality impact with no integrity or availability impact - consistent with Google's own 'Low' Chromium severity rating. All corroborating signals point the same direction rather than conflicting: SSVC assesses Exploitation as 'none', Automatable as 'no', and Technical Impact as only 'partial'. There is no CISA KEV listing and no public POC identified in the provided data, and no EPSS score was supplied. The signals are therefore mutually consistent - a genuine but minor information-disclosure bug requiring social engineering, not a priority for emergency patching. Because Automatable is 'no' and user interaction is mandatory, mass/automated exploitation is unlikely; any realistic abuse would be targeted. No key data is strongly conflicting, though the absence of an EPSS score means exploitation-probability modeling could not be independently cross-referenced.

Exploit ScenarioDerived

An attacker uses social engineering to lure a Chrome user into visiting a crafted HTML page, which abuses incomplete cleanup in the Glic component to read data belonging to another origin. No public exploit code was identified in the available data, and successful exploitation depends on the victim actively interacting with the attacker-controlled 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 06, 2026

Cross-origin information disclosure in Google Chrome's Glic integrated AI assistant component allows a remote attacker to leak data from other origins by convincing a victim to open a crafted HTML page; the flaw is an incomplete-cleanup bug (CWE-459) affecting Chrome builds prior to 155.0.8059.39. The attack is remote but requires user interaction (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N, base 4.3), and impact is limited to low-sensitivity read access with no integrity or availability effect, so the practical risk is low. There is no public exploit identified at time of analysis, CISA SSVC records no known exploitation and marks the issue as not automatable, and the vendor has already shipped a fix in the stable channel.

RemediationAI

Vendor-released patch: 155.0.8059.39 - upgrade Chrome to version 155.0.8059.39 or later, which administrators and users can do through the normal stable-channel update path (Chrome menu > Help > About Google Chrome, or the equivalent enterprise/managed-browser update mechanism), and confirm the installed build with chrome://version; details are in the vendor advisory at https://chromereleases.googleblog.com/2026/10/stable-channel-update-for-desktop_086471744.html. If immediate fleet-wide upgrading is not possible, the practical compensating controls are to disable or restrict the Glic assistant through the relevant enterprise policies for the feature, which removes the vulnerable attack surface at the cost of losing the integrated AI assistant functionality, and to reduce exposure to the social-engineering prerequisite by blocking/alerting on untrusted links and restricting access to the feature via policy on high-sensitivity managed devices. Because exploitation requires the victim to actively visit an attacker-controlled crafted page, user-awareness controls against unsolicited links provide only marginal incremental protection and should not be treated as a substitute for patching; there is no evidence of active exploitation, so emergency isolation of the browser is not warranted.

Affected VersionsENISA

Chrome 155.0.8059.39 <155.0.8059.39

Affected Packages

euvd chrome fix: 155.0.8059.39

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 vulnerability class is CWE-459 (Incomplete Cleanup): state or resources associated with a transient operation are not properly purged, leaving stale data reachable after the operation that produced it has finished. Here that occurs inside Glic, the AI/Gemini-style assistant surface integrated into Chrome, where insufficient teardown of browsing context data allows content from a different origin to be surfaced to an attacker-controlled page. Because browsers rely on strict origin separation to enforce the same-origin policy, a cleanup gap in a privileged or privileged-adjacent feature can undermine that boundary even without a memory-corruption primitive. The CPE cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:* confirms the affected product is the Chrome browser itself (all versions before the fixed build), rather than a separate library or embedded component. The CVSS vector AV:N/PR:N indicates the malicious page can be delivered over the network by any unauthenticated attacker, while UI:R and the Chrome-reported 'Low' Chromium severity reflect that the victim must be socially engineered into navigating to the crafted page before the flaw can be triggered.

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Severity by source

Vendor (Chrome) PRIMARY 4.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
vuln.today AI 4.3 MEDIUM

Remote crafted page requires no privileges (PR:N) but mandatory victim interaction (UI:R); impact is limited to a cross-origin confidentiality leak (C:L), with no integrity or availability effect.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Red Hat 4.3 LOW

Primary rating from Vendor (Chrome).

CVSS VectorVendor: Chrome

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

Lifecycle Timeline

4
CVSS changed
Oct 06, 2026 - 22:22 NVD
4.3 (None) 4.3 (MEDIUM)
Patch available
Oct 06, 2026 - 20:04 EUVD
CVE Published
Oct 06, 2026 - 18:41 cve.org
UNKNOWN (no severity yet)
CVE Published
Oct 06, 2026 - 18:41 cve.org
MEDIUM 4.3

DescriptionCVE.org

Incomplete cleanup in Glic in Google Chrome prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to leak cross-origin data via a crafted HTML page. (Chromium security severity: Low)

Threat Intelligence Overview

EPSS Score
0.2%
Top 92% exploitable
Prevalence
Ubiquitous
Google Chrome is one of the most widely deployed browsers worldwide
Data Quality
6 sources
Confidence: High

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
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
High
Technical Impact
Partial

Priority Score

22
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +22
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Vendor StatusVendor

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