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CVE-2026-87491 (GCVE-0-2026-87491)

Vulnerability from cvelistv5 – Published: 2026-09-09 00:09 – Updated: 2026-09-10 03:55
VLAI CISA Previdian
Summary
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)
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 00:00 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Google Chrome Affected: 153.0.8010.36 , < 153.0.8010.36 (custom)
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 7a439d6e-a205-4d18-8ef3-79d98a6a7140

Vulnerability ID: CVE-2026-87491

Status: Confirmed

Status Updated: 2026-09-09 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-09
Asserted: 2026-09-09
Scope
Notes: Google Chromium V8 Out of Bounds Write Vulnerability | Affected: Google / Chromium V8 | 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. | Due date: 2026-09-23 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-787
Feed CISA Known Exploited Vulnerabilities Catalog
Product Chromium V8
Due Date 2026-09-23
Date Added 2026-09-09
Vendorproject Google
Vulnerabilityname Google Chromium V8 Out of Bounds Write Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-09-09 20:00 UTC | Updated: 2026-09-09 20:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: d5483e57-314c-44e8-bcae-1ab146a7161c

Vulnerability ID: CVE-2026-87491

Status: Confirmed

Status Updated: 2026-09-09 08:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-09
Asserted: 2026-09-09
Scope
Notes: 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... | Affected: Google / Chrome | CVSS: 8.8 (HIGH) | EPSS: 0.00291 | Used in malware: unknown | Listed 11 hours ahead of CISA KEV | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title 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...
Cve Id CVE-2026-87491
Vendor Google
Ghsa Id GHSA-8X3P-8G9V-XC7M
Product Chrome
Added Date 2026-09-09T08:00:59.000Z
Cvss Score 8.8
Epss Score 0.00291
Previous Ids
Cvss Severity HIGH
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.21438
Used In Malware unknown
Vulnerability Id CVE-2026-87491
Ahead Of Cisa Kev 
{
  "count": 11,
  "unit": "hour"
}
Not Yet In Cisa Kev False
References
Created: 2026-09-10 08:22 UTC | Updated: 2026-09-10 08:22 UTC
Show details on NVD website
To clipboard 

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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.