Microsoft Edge (Chromium-based): Double free leads to remote code execution
Summary
A double free vulnerability (CWE-415) in Microsoft Edge (Chromium-based) allows an unauthorized remote attacker to execute code. The CVSS 3.1 base score is 8.8 and the vector requires user interaction, so a victim would typically need to open a malicious web page or link. The NVD analysis is still pending, and the vendor's fixed build must be verified against the MSRC entry.
Affected
- Microsoft Edge (Chromium-based) before 154.0.4258.37 (per third-party sources; lower bound unconfirmed)
- Note: sources conflict on the affected range; verify against MSRC.
Fixed in
- Build 154.0.4258.37 is reported as fixed by third-party sources, not confirmed by MSRC.
- A Nessus entry references Edge 155.0.4283.62 with multiple vulnerabilities; the minimum fixed build must be confirmed in the MSRC advisory.
Workaround
- No workaround known. Install the Edge update.
Exploitation
- No evidence of exploitation in the wild.
- Not listed in CISA KEV according to a GitHub alert tracker (not verified against CISA).
- No public proof-of-concept found.
- EPSS: 0.59% (percentile 48).
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
Our recommendation
- Check the MSRC advisory for the minimum fixed Edge build and confirm it.
- Inventory Edge versions on all endpoints.
- Update Edge and restart the browser on every machine below the fixed build.
- Keep Edge auto-update enabled and enforce a minimum version via Intune or Group Policy.
- Treat this as part of the same Edge batch (for example CVE-2026-85897 and CVE-2026-85898) and patch together.
- Re-check MSRC and CISA KEV weekly while NVD analysis is pending.
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 msrc.microsoft.com
- Vulners CVE entry vulners.com
- Strix.ai CVE entry www.strix.ai
- OffSeq threat radar radar.offseq.com
- Stack.watch Edge product page stack.watch
- CVEBrief archive cvebrief.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, 09:04.
Original description (NVD)
Double free 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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