CVE-2023-4863
Google Chromium WebP Heap-Based Buffer Overflow Vulnerability
IN CISA KEV
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)
- Vendor
- Product
- Chromium WebP
- CVSS 3.1
- 8.8 (high), scored by NVD (primary)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CVSS 3.1
- 8.8 (high), scored by 134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CWE
- CWE-787
- Published
- 2023-09-12
- NVD modified
- 2026-06-17
- NVD status
- Analyzed
CISA KEV
- Date added
- 2023-09-13
- Due date
- 2023-10-04
- Ransomware use
- Unknown
- Required action
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
EPSS
100% chance of exploitation in the next 30 days (percentile 99th)
FIRST EPSS, updated 17 Oct 2026. About EPSS
CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.
References
- www.openwall.com (Mailing List)
- www.openwall.com (Mailing List)
- www.openwall.com (Mailing List)
- www.openwall.com (Mailing List)
- www.openwall.com (Mailing List)
- www.openwall.com (Mailing List)
- www.openwall.com (Mailing List)
- www.openwall.com (Mailing List)
- www.openwall.com (Mailing List)
- www.openwall.com (Mailing List)
- www.openwall.com (Mailing List)
- www.openwall.com (Mailing List)
Data last updated 18 Oct 2026. Sources: NVD API 2.0, CISA KEV catalog, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.