CVE DATABASE / CVE-2023-4863
CVE-2023-4863
Google Chromium WebP Heap-Based Buffer Overflow Vulnerability
CVSS 8.8 · HIGH
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2023-09-13.
Federal remediation due 2023-10-04.
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Summary
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)
CVSS 3.1 breakdown
| Base score | 8.8 (HIGH) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | REQUIRED |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity | HIGH |
| Availability | HIGH |
Weakness type (CWE)
Affected products
Google chromeFedoraproject fedoraDebian debian linuxMozilla firefoxMozilla thunderbirdMicrosoft edge chromiumMicrosoft teamsMicrosoft webp image extensionWebmproject libwebpNetapp active iq unified managerBentley seequent leapfrogBandisoft honeyview
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References
- http://www.openwall.com/lists/oss-security/2023/09/21/4
- http://www.openwall.com/lists/oss-security/2023/09/22/1
- http://www.openwall.com/lists/oss-security/2023/09/22/3
- http://www.openwall.com/lists/oss-security/2023/09/22/4
- http://www.openwall.com/lists/oss-security/2023/09/22/5
- http://www.openwall.com/lists/oss-security/2023/09/22/6
- http://www.openwall.com/lists/oss-security/2023/09/22/7
- http://www.openwall.com/lists/oss-security/2023/09/22/8
- http://www.openwall.com/lists/oss-security/2023/09/26/1
- http://www.openwall.com/lists/oss-security/2023/09/26/7
- http://www.openwall.com/lists/oss-security/2023/09/28/1
- http://www.openwall.com/lists/oss-security/2023/09/28/2
- http://www.openwall.com/lists/oss-security/2023/09/28/4
- https://adamcaudill.com/2023/09/14/whose-cve-is-it-anyway/
- https://blog.isosceles.com/the-webp-0day/
Data: NIST NVD + CISA KEV. NVD last modified 2025-10-24. Always verify against the vendor advisory before acting.