---
title: "CVE-2026-85046: Google Chromium V8 Type Confusion Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-85046/
description: "CVE-2026-85046 (Google Chromium V8): Exploited in the wild (CISA KEV). Type confusion in V8 in Google Chrome prior to 152.0.7977.82 allowed a remote…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-09-03
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-85046"
kev: true
cvss: 8.8
epss: 0.48881
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-85046: Google Chromium V8 Type Confusion Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Google Chromium V8. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-09-04, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-09-18 ; treat that as the outer limit, not the target.
- EPSS 48.9% , percentile 99: FIRST’s model estimates a 48.9% chance of exploitation activity in the next 30 days, higher than 99% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.
- Editorial verdict: Check exposure. Chrome V8 Zero-Days CVE-2026-85046 and CVE-2026-87491 — Both were exploited zero-days, but Chrome and Edge fixed them in early September and auto-update has had six weeks to deliver the fix; the job now is finding browsers that did not update, not a scramble.

## What it is

Type confusion in V8 in Google Chrome prior to 152.0.7977.82 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)

## Affected products (CVE record)

- Google Chrome: 152.0.7977.82 < 152.0.7977.82

## Severity

- CISA-ADP CVSS 3.1: 8.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2026-09-04; federal due date 2026-09-18. Known ransomware use: Unknown.
- CISA 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.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 48.88% probability of exploitation activity in the next 30 days; percentile 99.

## Sources

- [Listed in CISA KEV notes (chromereleases.googleblog.com)](https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_01882797386.html)
- [CVE.org record CVE-2026-85046](https://www.cve.org/CVERecord?id=CVE-2026-85046)
- [NVD entry CVE-2026-85046](https://nvd.nist.gov/vuln/detail/CVE-2026-85046)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-85046)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk)
- [issues.chromium.org](https://issues.chromium.org/issues/542403045)
- [serotav.github.io](https://serotav.github.io/Writeups/v8/when-sorting-leads-to-confusion/)
- [github.com](https://github.com/v8/v8/commit/e0562d87ad9c17042b581582c99237d798572e67)
- [github.com](https://github.com/Serotav/Writeups/blob/77556c57999805fa7815a114da51d91cf24fbea9/v8/When_Sorting_Leads_To_Confusion.md)
- [news.ycombinator.com](https://news.ycombinator.com/item?id=49570669)

---
Source page: https://erroneo.us/security/cve/CVE-2026-85046/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt