Google Chromium V8 Type Confusion Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2025-09-23
• Critical severity: CVSS 9.8

[ Description ]Official description

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: Google Chromium contains a type confusion vulnerability in the V8 JavaScript and WebAssembly engine.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 14 Oct 2025): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• chromereleases.googleblog.com/2025/09/stable-channel-update-for-desktop_17.htmlRelease NotesVendor Advisory
• issues.chromium.org/issues/445380761Issue TrackingPermissions Required
• cert-portal.siemens.com/productcert/html/ssa-470355.htmlThird Party Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource