Google Chromium WebP Heap-Based Buffer Overflow Vulnerability
Google Chromium WebP contains a heap-based buffer overflow vulnerability that allows a remote attacker to perform an out-of-bounds memory write via a crafted HTML page. This vulnerability can affect applications that use the WebP Codec.
- Vendor
- Product
- Chromium WebP
- CVSS
- 8.8
- EPSS (exploit probability)
- 100.0%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2023-4863 being exploited?
Yes. CISA added CVE-2023-4863 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 100.0% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-19. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Google CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2026-106382 Use-after-free in Chromecast allows sandbox code executionwrite-up | [ CRITICAL ] | 9.6 | 0.4% | — |
| CVE-2026-106358 Use-after-free in Chrome Navigation allows sandbox code executionwrite-up | [ CRITICAL ] | 9.6 | 0.5% | — |
| CVE-2026-106347 Use-after-free in Chrome Track component allows sandbox code executionwrite-up | [ HIGH ] | 8.8 | 0.4% | — |
| CVE-2026-106197 Use-after-free in Chrome Browser component enables sandbox RCEwrite-up | [ CRITICAL ] | 9.6 | 0.5% | — |
| CVE-2026-58704 Google Pixel Cellular Modem Improper Authorizationwrite-up | [ HIGH ] | 8.8 | 0.6% | |
| CVE-2026-87491 Google Chromium V8 Out of Bounds Write Vulnerability | [ HIGH ] | 8.8 | 3.1% | |
| CVE-2026-85046 Type confusion in Chrome V8 allows sandbox code executionwrite-up | [ HIGH ] | 8.8 | 48.9% | |
| CVE-2026-15765 Chrome Ozone use-after-freewrite-up | [ HIGH ] | 7.5 | 0.5% | — |