---
id: CVE-2023-4863
aliases:
  - GHSA-j7hp-h8jx-5ppr
  - A-299477569
  - ASB-A-299477569
  - CVE-2023-5129
  - PYSEC-2026-1794
  - RUSTSEC-2023-0060
  - RUSTSEC-2023-0061
title: 'libwebp: OOB write in BuildHuffmanTable'
summary: 'libwebp: OOB write in BuildHuffmanTable'
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
exploited: true
vendor: libwebp-sys2
product: libwebp-sys2
ecosystem: rust
affected:
  - libwebp-sys2 < 0.1.8
  - libwebp-sys < 0.9.3
  - 'electron >= 22.0.0, < 22.3.24'
  - 'electron >= 24.0.0, < 24.8.3'
  - 'electron >= 25.0.0, < 25.8.1'
  - 'electron >= 26.0.0, < 26.2.1'
  - 'electron >= 27.0.0-beta.1, < 27.0.0-beta.2'
  - 'SkiaSharp >= 2.0.0, < 2.88.6'
  - 'github.com/chai2010/webp >= 1.1.2, < 1.4.0'
  - pillow < 10.0.1
  - webp < 0.2.6
  - magick.net-q16-anycpu < 13.3.0
  - magick.net-q16-hdri-anycpu < 13.3.0
  - magick.net-q16-x64 < 13.3.0
  - magick.net-q8-anycpu < 13.3.0
  - magick.net-q8-openmp-x64 < 13.3.0
  - magick.net-q8-x64 < 13.3.0
  - github.com/chai2010/webp < 0.0.0-20250406010349-76805d5a8860
  - 'github.com/chai2010/webp >= 0.0.0, < 1.1.2-0.20250406010349-76805d5a8860'
patched:
  - libwebp-sys2 0.1.8
  - libwebp-sys 0.9.3
  - electron 22.3.24
  - electron 24.8.3
  - electron 25.8.1
  - electron 26.2.1
  - electron 27.0.0-beta.2
  - SkiaSharp 2.88.6
  - github.com/chai2010/webp 1.4.0
  - pillow 10.0.1
  - webp 0.2.6
  - magick.net-q16-anycpu 13.3.0
  - magick.net-q16-hdri-anycpu 13.3.0
  - magick.net-q16-x64 13.3.0
  - magick.net-q8-anycpu 13.3.0
  - magick.net-q8-openmp-x64 13.3.0
  - magick.net-q8-x64 13.3.0
  - github.com/chai2010/webp 0.0.0-20250406010349-76805d5a8860
  - github.com/chai2010/webp 1.1.2-0.20250406010349-76805d5a8860
published: '2023-09-12'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:01.877717636Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-j7hp-h8jx-5ppr'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-4863'
  - url: 'https://github.com/qnighy/libwebp-sys2-rs/pull/21'
  - url: 'https://github.com/python-pillow/Pillow/pull/7395'
  - url: 'https://github.com/jaredforth/webp/pull/30'
  - url: 'https://github.com/electron/electron/pull/39823'
  - url: 'https://github.com/electron/electron/pull/39825'
  - url: 'https://github.com/electron/electron/pull/39826'
  - url: 'https://github.com/electron/electron/pull/39827'
  - url: 'https://github.com/electron/electron/pull/39828'
  - url: >-
      https://github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17a
  - url: >-
      https://github.com/qnighy/libwebp-sys2-rs/commit/4560c473a76ec8bd8c650f19ddf9d7a44f719f8b
  - url: >-
      https://github.com/jaredforth/webp/commit/9d4c56e63abecc777df71c702503c3eaabd7dcbc
  - url: 'https://security.gentoo.org/glsa/202401-10'
  - url: 'https://security.gentoo.org/glsa/202309-05'
  - url: 'https://security-tracker.debian.org/tracker/CVE-2023-4863'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2023-0061.html'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2023-0060.html'
  - url: 'https://pillow.readthedocs.io/en/stable/releasenotes/10.0.1.html#security'
  - url: 'https://news.ycombinator.com/item?id=37478403'
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-4863'
  - url: 'https://adamcaudill.com/2023/09/14/whose-cve-is-it-anyway'
  - url: 'https://security.netapp.com/advisory/ntap-20230929-0011'
  - url: 'https://sethmlarson.dev/security-developer-in-residence-weekly-report-16'
  - url: 'https://stackdiary.com/critical-vulnerability-in-webp-codec-cve-2023-4863'
  - url: 'https://www.bentley.com/advisories/be-2023-0001'
  - url: >-
      https://www.bleepingcomputer.com/news/google/google-fixes-another-chrome-zero-day-bug-exploited-in-attacks
  - url: 'https://www.debian.org/security/2023/dsa-5496'
  - url: 'https://www.debian.org/security/2023/dsa-5497'
  - url: 'https://www.debian.org/security/2023/dsa-5498'
  - url: 'https://www.mozilla.org/en-US/security/advisories/mfsa2023-40'
  - url: >-
      https://www.vicarius.io/vsociety/posts/zero-day-webp-vulnerability-cve-2023-4863
  - url: 'https://blog.isosceles.com/the-webp-0day'
  - url: 'https://bugzilla.suse.com/show_bug.cgi?id=1215231'
  - url: >-
      https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.html
  - url: 'https://crbug.com/1479274'
  - url: 'https://en.bandisoft.com/honeyview/history'
  - url: 'https://github.com/ImageMagick/ImageMagick/discussions/6664'
  - url: 'https://github.com/dlemstra/Magick.NET/releases/tag/13.3.0'
  - url: 'https://github.com/webmproject/libwebp'
  - url: 'https://github.com/webmproject/libwebp/releases/tag/v1.3.2'
  - url: 'https://lists.debian.org/debian-lts-announce/2023/09/msg00015.html'
  - url: 'https://lists.debian.org/debian-lts-announce/2023/09/msg00016.html'
  - url: 'https://lists.debian.org/debian-lts-announce/2023/09/msg00017.html'
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6T655QF7CQ3DYAMPFV7IECQYGDEUIVVT
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FYYKLG6CRGEDTNRBSU26EEWAO6D6U645
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KUQ7CTX3W372X3UY56VVNAHCH6H2F4X3
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OZDGWWMJREPAGKWCJKSCM4WYLANSKIFX
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PYZV7TMKF4QHZ54SFJX54BDN52VHGGCX
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WHOLML7N2G5KCAZXFWC5IDFFHSQS5SDB
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WTRUIS3564P7ZLM2S2IH4Y4KZ327LI4I
  - url: 'http://www.openwall.com/lists/oss-security/2023/09/21/4'
  - url: 'http://www.openwall.com/lists/oss-security/2023/09/22/1'
  - url: 'http://www.openwall.com/lists/oss-security/2023/09/22/3'
  - url: 'http://www.openwall.com/lists/oss-security/2023/09/22/4'
  - url: 'http://www.openwall.com/lists/oss-security/2023/09/22/5'
  - url: 'http://www.openwall.com/lists/oss-security/2023/09/22/6'
  - url: 'http://www.openwall.com/lists/oss-security/2023/09/22/7'
  - url: 'http://www.openwall.com/lists/oss-security/2023/09/22/8'
  - url: 'http://www.openwall.com/lists/oss-security/2023/09/26/1'
  - url: 'http://www.openwall.com/lists/oss-security/2023/09/26/7'
  - url: 'http://www.openwall.com/lists/oss-security/2023/09/28/1'
  - url: 'http://www.openwall.com/lists/oss-security/2023/09/28/2'
  - url: 'http://www.openwall.com/lists/oss-security/2023/09/28/4'
tags:
  - osv
  - rust
  - kev
  - in-the-wild
  - exploit-available
epss: 0.99979
epssPercentile: 0.9998
kev: true
kevDateAdded: '2023-09-13'
kevDueDate: '2023-10-04'
kevRansomware: false
exploits:
  github: 14
  githubRepos:
    - 'https://github.com/mistymntncop/CVE-2023-4863'
    - 'https://github.com/bbaranoff/CVE-2023-4863'
    - 'https://github.com/talbeerysec/BAD-WEBP-CVE-2023-4863'
  checkedAt: '2026-09-12T03:13:37.766Z'
exploitAvailable: true
zeroDay: true
ingestedAt: '2026-07-08T18:25:50.604Z'
---

## Overview

Heap buffer overflow in libwebp allow a remote attacker to perform an out of bounds memory write via a crafted HTML page.

## Affected packages

- `libwebp-sys2 < 0.1.8`
- `libwebp-sys < 0.9.3`
- `electron >= 22.0.0, < 22.3.24`
- `electron >= 24.0.0, < 24.8.3`
- `electron >= 25.0.0, < 25.8.1`
- `electron >= 26.0.0, < 26.2.1`
- `electron >= 27.0.0-beta.1, < 27.0.0-beta.2`
- `SkiaSharp >= 2.0.0, < 2.88.6`
- `github.com/chai2010/webp >= 1.1.2, < 1.4.0`
- `pillow < 10.0.1`
- `webp < 0.2.6`
- `magick.net-q16-anycpu < 13.3.0`
- `magick.net-q16-hdri-anycpu < 13.3.0`
- `magick.net-q16-x64 < 13.3.0`
- `magick.net-q8-anycpu < 13.3.0`
- `magick.net-q8-openmp-x64 < 13.3.0`
- `magick.net-q8-x64 < 13.3.0`
- `github.com/chai2010/webp < 0.0.0-20250406010349-76805d5a8860`
- `github.com/chai2010/webp >= 0.0.0, < 1.1.2-0.20250406010349-76805d5a8860`

## Remediation

Upgrade to a patched release:

- `libwebp-sys2 0.1.8`
- `libwebp-sys 0.9.3`
- `electron 22.3.24`
- `electron 24.8.3`
- `electron 25.8.1`
- `electron 26.2.1`
- `electron 27.0.0-beta.2`
- `SkiaSharp 2.88.6`
- `github.com/chai2010/webp 1.4.0`
- `pillow 10.0.1`
- `webp 0.2.6`
- `magick.net-q16-anycpu 13.3.0`
- `magick.net-q16-hdri-anycpu 13.3.0`
- `magick.net-q16-x64 13.3.0`
- `magick.net-q8-anycpu 13.3.0`
- `magick.net-q8-openmp-x64 13.3.0`
- `magick.net-q8-x64 13.3.0`
- `github.com/chai2010/webp 0.0.0-20250406010349-76805d5a8860`
- `github.com/chai2010/webp 1.1.2-0.20250406010349-76805d5a8860`