Microsoft Edge (Chromium-based): Heap-based buffer overflow allows code execution
Summary
A heap-based buffer overflow (CWE-122) in Microsoft Edge (Chromium-based) allows an unauthenticated remote attacker to execute code. The CVSS base score is 8.8 (High). Exploitation requires that a user is tricked into interacting, most likely by opening a malicious web page. CISA SSVC lists exploitation as none and automatable as no.
Affected
- Microsoft Edge (Chromium-based) from 1.0.0.0 up to but excluding 154.0.4258.37 (per CNA data; the MSRC advisory is the authoritative source).
- Conflicting data: some sources cite 155.0.4283.62 as the fixed build. Unresolved.
Fixed in
- Upgrade to Microsoft Edge 154.0.4258.37 or later, per OffSeq and Tenable. Unverified against MSRC.
- Unknown: the exact fixed build named in the MSRC advisory. Install the newest Stable build, which covers all candidate builds listed above.
Workaround
- Unknown: no vendor-documented workaround or browser policy that reduces exposure has been identified. Patching is the only verified remedy.
Exploitation
- Not known to be exploited (OffSeq). Not listed in CISA KEV according to a third-party tracker, not verified against CISA.
- No public proof of concept found.
Our recommendation
- Confirm the exact fixed build in the MSRC advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96198
- Deploy the latest Stable Microsoft Edge to all Windows endpoints via Windows Update, Intune or WSUS.
- Verify installed Edge versions on each device, including pinned or stale installations.
- Prioritise workstations with stored credentials or access to business applications.
- Re-check this entry once NVD completes its analysis (status: Undergoing Analysis).
Information from Microsoft (Patch Tuesday October 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- MSRC Security Update Guide: CVE-2026-96198 msrc.microsoft.com
- Tenable plugin 363354 www.tenable.com
- Microsoft Edge Stable channel release notes learn.microsoft.com
- OffSeq Radar: CVE-2026-96198 radar.offseq.com
- Vulners: MS:CVE-2026-96198 vulners.com
- Strix: CVE-2026-96198 www.strix.ai
- MSRC Security Guidance msrc.microsoft.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, 09:03.
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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