Security Digest · Vulnerability record · Known exploited
CVE-2025-10585: Google Chromium V8 Type Confusion Vulnerability
Exploited in the wild (CISA KEV). Type confusion in V8 in Google Chrome prior to 140.0.7339.185 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
CISA KEV · added 2025-09-23 CVSS 8.8 High EPSS 5.4% · p93
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run Google Chromium V8. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-09-23, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-10-14; treat that as the outer limit, not the target.
- EPSS 5.4%, percentile 93: FIRST’s model estimates a 5.4% chance of exploitation activity in the next 30 days, higher than 93% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.
What it is
Type confusion in V8 in Google Chrome prior to 140.0.7339.185 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)
CISA’s summary
Google Chromium contains a type confusion vulnerability in the V8 JavaScript and WebAssembly engine.
Weakness type: CWE-843.
Product: Google Chromium V8 · Assigned by: Chrome · Published: 2025-09-24
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Chrome | 140.0.7339.185 < 140.0.7339.185 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADP | 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: required (a user must click/open something)
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2025-09-23; federal due date 2025-10-14. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active, automatable no, technical impact total.
- FIRST EPSS (model of 2026-10-21): 5.39% probability of exploitation activity in the next 30 days; percentile 93.
Timeline
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CVE record published by Chrome
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- Listed in CISA KEV notes (chromereleases.googleblog.com) chromereleases.googleblog.com
Vulnerability records
- CVE.org record CVE-2025-10585 cve.org
- NVD entry CVE-2025-10585 nvd.nist.gov
Government
Other references from the CVE record and advisory
- issues.chromium.org issues.chromium.org
- cert-portal.siemens.com cert-portal.siemens.com
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