Microsoft Edge (Chromium-based): Remote code execution via heap buffer overflow
Summary
Microsoft Edge (Chromium-based) contains a heap-based buffer overflow that allows an unauthenticated remote attacker to execute code. Exploitation requires that a user visits a malicious or compromised web page, for example through phishing or malicious advertising. Microsoft rates the impact as high for confidentiality, integrity and availability, with a CVSS base score of 8.8.
Affected
- Microsoft Edge (Chromium-based) from 1.0.0.0 before 154.0.4258.37
Fixed in
- Fixed in 154.0.4258.37 (per secondary sources; confirm the build in the MSRC Security Update table)
Workaround
Unknown. No vendor workaround was found. Patching is the mitigation.
Exploitation
- Not known to be exploited in the wild.
- Not listed in CISA KEV according to a third-party tracker; the CISA catalogue was not checked directly.
- Microsoft reports no public disclosure and no publicly available exploit code.
Our recommendation
- Update Microsoft Edge to version 154.0.4258.37 or later on all endpoints, and confirm the build number in the MSRC Security Update table first.
- Keep Edge auto-update enabled and check installed versions on managed Windows devices.
- Prioritise endpoints used for general web browsing and monitor them for unexpected browser crashes.
Information from Microsoft (Patch Tuesday October 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-85897 msrc.microsoft.com
- Strix AI: CVE-2026-85897 www.strix.ai
- OffSeq Radar: CVE-2026-85897 radar.offseq.com
- Vulners: CVE-2026-85897 vulners.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 09:05.
Original description (NVD)
Heap-based buffer overflow in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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