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Known Exploited Vulnerability
8.8
HIGH CVSS 3.1
CVE-2026-87491
Google Chromium V8 Out of Bounds Write Vulnerability - [Actively Exploited]
Overview
Description

Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

Details
INFO

Published Date :

Sept. 9, 2026, 1:17 a.m.

Last Modified :

Sept. 21, 2026, 1:17 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

Google Chromium V8 contains an out of bounds write vulnerability that allows a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.

Required Action :

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Known Ransomware Campaign Use:

Unknown

Notes :

https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-87491

Impact
Affected Products

The following products are affected by CVE-2026-87491 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Google chrome
2 Google chrome
1 Microsoft edge_chromium
: Total Affected Vendor : 2 | Products : 3
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 HIGH 134c704f-9b21-4f2e-91b3-4a467353bcc0
Solution
Update Google Chrome to version 153.0.8010.36 or later to fix memory corruption.
  • Update Google Chrome to the latest version.
  • Apply vendor patches for affected components.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-87491.

URL Resource
https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html Release Notes Vendor Advisory
https://issues.chromium.org/issues/543557673 Permissions Required
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-87491 US Government Resource
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-87491 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-87491 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-87491 vulnerability anywhere in the article.

  • The Hacker News
Chinese Hackers Exploit Chrome-Windows Zero-Day Chain to Deploy CLEANGULP Malware

A Chinese threat actor codenamed UTA0565 has been observed exploiting the recently disclosed Google Chrome-Microsoft Windows exploit chain as zero-days through fake websites. The attacks, detected on ... Read more

Published Date: Sep 23, 2026 (1 week ago)
  • The Hacker News
China-Linked Hackers Exploit Chrome-Windows Zero-Day Chain to Deploy GRIMWEDGE

A Chinese threat actor has been attributed to a spear-phishing campaign that exploits recently patched security flaws in Google Chrome and Microsoft Windows to deliver a malicious JavaScript backdoor ... Read more

Published Date: Sep 15, 2026 (2 weeks, 1 day ago)
  • Krypt3ia
Weekly ALL-SOURCE Cyber Warfare Intelligence Brief 9.14.26

Reporting period: September 7–14, 2026Scope: State and state-aligned cyber operations, APT activity, technical campaign intelligence, active exploitation, and cyber-enabled military/intelligence activ ... Read more

Published Date: Sep 14, 2026 (2 weeks, 2 days ago)
  • security.nl
Google Chrome-gebruikers op Windows 10 doelwit zeroday-aanval

Gebruikers van Google Chrome op Windows 10 zijn het doelwit geworden van een zeroday-aanval, zo meldt cybersecuritybedrijf Proofpoint. De aanvallers combineerden drie kwetsbaarheden waar op het moment ... Read more

Published Date: Sep 10, 2026 (2 weeks, 6 days ago)
  • TheCyberThrone
CISA KEV Update – 8 Vulnerabilities Added in Two Days

CISA’s Known Exploited Vulnerabilities (KEV) Catalog saw a significant two-day update on September 8 and September 9, 2026, with eight vulnerabilities added based on evidence of active exploitation.CI ... Read more

Published Date: Sep 10, 2026 (2 weeks, 6 days ago)
  • The Hacker News
Chrome V8 Zero-Day Exploited in the Wild Enables Code Execution Inside Sandbox

Google on Thursday released updates to patch 230 security vulnerabilities, including one that has come under active exploitation in the wild. The medium-severity vulnerability, assigned the CVE identi ... Read more

Published Date: Sep 09, 2026 (3 weeks ago)
  • security.nl
Google patcht ruim 200 kwetsbaarheden in Chrome, waaronder misbruikt lek

Google heeft een beveiligingsupdate voor Chrome uitgebracht die ruim tweehonderd beveiligingslekken verhelpt, waaronder een kwetsbaarheid waar aanvallers actief misbruik van maken. Van de in totaal 23 ... Read more

Published Date: Sep 09, 2026 (3 weeks ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-87491 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 21, 2026

    Action Type Old Value New Value
    Changed SSVC {'id': 'CVE-2026-87491', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-09T00:00:00+00:00'} {'id': 'CVE-2026-87491', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-10T03:55:21.039385Z'}
  • Modified Analysis by [email protected]

    Sep. 10, 2026

    Action Type Old Value New Value
    Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-87491 Types: US Government Resource
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 10, 2026

    Action Type Old Value New Value
    Changed SSVC {'id': 'CVE-2026-87491', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-09T19:50:19.378603Z'} {'id': 'CVE-2026-87491', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-09T00:00:00+00:00'}
  • CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725

    Sep. 09, 2026

    Action Type Old Value New Value
    Added Date Added 2026-09-09
    Added Due Date 2026-09-09
    Added Required Action 2026-09-09
    Added Vulnerability Name 2026-09-09
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 09, 2026

    Action Type Old Value New Value
    Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-87491
    Changed SSVC {'id': 'CVE-2026-87491', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-09T10:29:12.810434Z'} {'id': 'CVE-2026-87491', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-09T19:50:19.378603Z'}
  • Initial Analysis by [email protected]

    Sep. 09, 2026

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:* versions up to (excluding) 153.0.8010.36
    Added Reference Type Chrome: https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html Types: Release Notes, Vendor Advisory
    Added Reference Type Chrome: https://issues.chromium.org/issues/543557673 Types: Permissions Required
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 09, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
    Added SSVC {'id': 'CVE-2026-87491', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-09T10:29:12.810434Z'}
  • New CVE Received by [email protected]

    Sep. 09, 2026

    Action Type Old Value New Value
    Added Description Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
    Added CWE CWE-787
    Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/87xxx/CVE-2026-87491.json">CVE-2026-87491</a>
    Added Reference https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html
    Added Reference https://issues.chromium.org/issues/543557673
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 8.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact