What is CVE-2023-4863?
Heap buffer overflow in libwebp in Google Chrome prior to 116.0.5845.187 and libwebp 1.3.2 allowed a remote attacker to perform an out of bounds memory write via a crafted HTML page. (Chromium security severity: Critical)
Timeline
- 2023-09-12Published to the U.S. National Vulnerability Database (NVD)
- 2023-09-13Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
- 2023-10-04CISA federal remediation deadline (BOD 22-01)
- 2026-06-17NVD record last updated
CISA Known Exploited Vulnerability
Google Chromium WebP Heap-Based Buffer Overflow Vulnerability
Affected product
Google Chromium WebP
NVD also lists CPE entries for: Google Chrome, Bandisoft Honeyview, Microsoft Edge Chromium, Microsoft Teams, Microsoft Webp Image Extension
Remediation Steps
- Identify and inventory all Mitsubishi Electric products in the affected suite deployed in your environment
- Obtain vendor security advisories and patches from Mitsubishi Electric official channels
- Test patches in non-production ICS environment before deployment
- Implement network segmentation to restrict unauthorized access to affected systems
- Apply patches according to maintenance windows and operational requirements
References
- https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.html
- https://crbug.com/1479274
- https://github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17a
- https://nvd.nist.gov/vuln/detail/CVE-2023-4863
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Referenced in our briefings & reports
- Vulnerability Priority Report – Week 4 of October 2026 (October 26 – November 1)
Related vulnerabilities
- CVE-2026-87491 – Google Chromium V8 (same product)
- CVE-2026-85046 – Google Chromium V8 (same product)
- CVE-2026-11645 – Google Chromium V8 (same product)
- CVE-2026-5281 – Google Dawn (same product)
- CVE-2026-111497 – Google Brotli (same vendor)
- CVE-2026-96951 – Microsoft Windows (same vendor)
Browse all tracked CVEs in the defend.network CVE database →
🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.