---
id: "CVE-2023-4863"
kind: "vulnerability"
aliases: ["CVE-2023-4863"]
title: "Heap buffer overflow in libwebp in Google Chrome prior to 116.0.5845.187 and libwebp 1.3.2 allowed a remote attacker\u2026"
severity: "critical"
cvss: 8.8
epss: null
exploited: true
status: "open"
category: "runtime"
products: [{"name": "Google Chromium WebP", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "google chrome", "fixed": ["116.0.5845.187"], "affected": "< 116.0.5845.187", "ecosystem": "vendor"}, {"name": "fedoraproject fedora", "fixed": [], "affected": "= 37", "ecosystem": "vendor"}, {"name": "fedoraproject fedora", "fixed": [], "affected": "= 38", "ecosystem": "vendor"}, {"name": "fedoraproject fedora", "fixed": [], "affected": "= 39", "ecosystem": "vendor"}, {"name": "debian linux", "fixed": [], "affected": "= 10.0", "ecosystem": "vendor"}, {"name": "debian linux", "fixed": [], "affected": "= 11.0", "ecosystem": "vendor"}, {"name": "debian linux", "fixed": [], "affected": "= 12.0", "ecosystem": "vendor"}, {"name": "mozilla firefox", "fixed": ["102.15.1"], "affected": "< 102.15.1", "ecosystem": "vendor"}, {"name": "mozilla firefox", "fixed": ["117.0.1"], "affected": "< 117.0.1", "ecosystem": "vendor"}, {"name": "mozilla firefox", "fixed": ["115.2.1"], "affected": ">= 115.1.0, < 115.2.1", "ecosystem": "vendor"}, {"name": "mozilla thunderbird", "fixed": ["102.15.1"], "affected": "< 102.15.1", "ecosystem": "vendor"}, {"name": "mozilla thunderbird", "fixed": ["115.2.2"], "affected": ">= 115.0, < 115.2.2", "ecosystem": "vendor"}, {"name": "microsoft edge chromium", "fixed": ["116.0.1938.81"], "affected": "< 116.0.1938.81", "ecosystem": "vendor"}, {"name": "microsoft teams", "fixed": ["1.6.00.26463"], "affected": "< 1.6.00.26463", "ecosystem": "vendor"}, {"name": "microsoft teams", "fixed": ["1.6.00.26474"], "affected": "< 1.6.00.26474", "ecosystem": "vendor"}, {"name": "microsoft webp image extension", "fixed": ["1.0.62681.0"], "affected": "< 1.0.62681.0", "ecosystem": "vendor"}, {"name": "webmproject libwebp", "fixed": ["1.3.2"], "affected": "< 1.3.2", "ecosystem": "vendor"}, {"name": "netapp active iq unified manager", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "bentley seequent leapfrog", "fixed": ["2023.2"], "affected": "< 2023.2", "ecosystem": "vendor"}, {"name": "bandisoft honeyview", "fixed": ["5.51"], "affected": "< 5.51", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["browsers", "chrome", "chromium", "electron", "exploited", "runtime", "webp"]
not_affected_if: ["unpatched-libwebp-absent"]
published_at: "2023-09-12T15:15:24+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T22:29:04+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-4863", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-4863", "first_seen_at": "2026-10-23T22:29:04+00:00"}]
---

# Heap buffer overflow in libwebp in Google Chrome prior to 116.0.5845.187 and libwebp 1.3.2 allowed a remote attacker…

A heap-based buffer overflow in the WebP image decoder used by Google Chromium lets a remote attacker write out of bounds in memory using a crafted HTML page. Applications that use the WebP codec are also affected, and CISA reports it is being exploited in the wild.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Google Chromium WebP affected ? fixed ?
- vendor:google chrome affected < 116.0.5845.187 fixed 116.0.5845.187
- vendor:fedoraproject fedora affected = 37 fixed ?
- vendor:fedoraproject fedora affected = 38 fixed ?
- vendor:fedoraproject fedora affected = 39 fixed ?
- vendor:debian linux affected = 10.0 fixed ?
- vendor:debian linux affected = 11.0 fixed ?
- vendor:debian linux affected = 12.0 fixed ?
- vendor:mozilla firefox affected < 102.15.1 fixed 102.15.1
- vendor:mozilla firefox affected < 117.0.1 fixed 117.0.1
- vendor:mozilla firefox affected >= 115.1.0, < 115.2.1 fixed 115.2.1
- vendor:mozilla thunderbird affected < 102.15.1 fixed 102.15.1
- vendor:mozilla thunderbird affected >= 115.0, < 115.2.2 fixed 115.2.2
- vendor:microsoft edge chromium affected < 116.0.1938.81 fixed 116.0.1938.81
- vendor:microsoft teams affected < 1.6.00.26463 fixed 1.6.00.26463
- vendor:microsoft teams affected < 1.6.00.26474 fixed 1.6.00.26474
- vendor:microsoft webp image extension affected < 1.0.62681.0 fixed 1.0.62681.0
- vendor:webmproject libwebp affected < 1.3.2 fixed 1.3.2
- vendor:netapp active iq unified manager affected ? fixed ?
- vendor:bentley seequent leapfrog affected < 2023.2 fixed 2023.2
- vendor:bandisoft honeyview affected < 5.51 fixed 5.51

## Fix

Apply the vendor mitigation or update Chromium-based browsers and WebP-linked applications to a patched release; CISA says to discontinue use of the product if mitigations are unavailable.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-4863
- 2026-10-23T22:29:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2023-4863

## From the sources

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.

CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_