# CVE-2023-4863: Google Chromium WebP Heap-Based Buffer Overflow Vulnerability

> CVE-2023-4863: Google Chromium WebP Heap-Based Buffer Overflow Vulnerability. CVSS 8.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2023-4863
Last updated: 2025-10-21T23:05:38Z

- Published: 2023-09-12 14:24 UTC · Updated: 2025-10-21 23:05 UTC · Assigner: Chrome
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 100.0%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2023-09-13, federal due date 2023-10-04, ransomware use: Unknown

## Description

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)

## CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

## Affected vendors and products

- Google: Chrome
- Google: libwebp

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2023-4863)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2023-4863)
- [https://adamcaudill.com/2023/09/14/whose-cve-is-it-anyway/](https://adamcaudill.com/2023/09/14/whose-cve-is-it-anyway/)
- [https://blog.isosceles.com/the-webp-0day/](https://blog.isosceles.com/the-webp-0day/)
- [https://bugzilla.suse.com/show\_bug.cgi?id=1215231](https://bugzilla.suse.com/show_bug.cgi?id=1215231)
- [https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop\_11.html](https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.html)
- [https://crbug.com/1479274](https://crbug.com/1479274)
- [https://en.bandisoft.com/honeyview/history/](https://en.bandisoft.com/honeyview/history/)
- [https://github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17a](https://github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17a)
- [https://github.com/webmproject/libwebp/releases/tag/v1.3.2](https://github.com/webmproject/libwebp/releases/tag/v1.3.2)
- [https://lists.debian.org/debian-lts-announce/2023/09/msg00015.html](https://lists.debian.org/debian-lts-announce/2023/09/msg00015.html)
- [https://lists.debian.org/debian-lts-announce/2023/09/msg00016.html](https://lists.debian.org/debian-lts-announce/2023/09/msg00016.html)
- [https://lists.debian.org/debian-lts-announce/2023/09/msg00017.html](https://lists.debian.org/debian-lts-announce/2023/09/msg00017.html)
- [https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6T655QF7CQ3DYAMPFV7IECQYGDEUIVVT/](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6T655QF7CQ3DYAMPFV7IECQYGDEUIVVT/)
- [https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FYYKLG6CRGEDTNRBSU26EEWAO6D6U645/](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FYYKLG6CRGEDTNRBSU26EEWAO6D6U645/)
- [https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KUQ7CTX3W372X3UY56VVNAHCH6H2F4X3/](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KUQ7CTX3W372X3UY56VVNAHCH6H2F4X3/)
- [https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OZDGWWMJREPAGKWCJKSCM4WYLANSKIFX/](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OZDGWWMJREPAGKWCJKSCM4WYLANSKIFX/)
- [https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PYZV7TMKF4QHZ54SFJX54BDN52VHGGCX/](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PYZV7TMKF4QHZ54SFJX54BDN52VHGGCX/)
- [https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WHOLML7N2G5KCAZXFWC5IDFFHSQS5SDB/](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WHOLML7N2G5KCAZXFWC5IDFFHSQS5SDB/)
- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-4863](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-4863)
- [https://news.ycombinator.com/item?id=37478403](https://news.ycombinator.com/item?id=37478403)
- [https://security.gentoo.org/glsa/202309-05](https://security.gentoo.org/glsa/202309-05)
- [https://security-tracker.debian.org/tracker/CVE-2023-4863](https://security-tracker.debian.org/tracker/CVE-2023-4863)
- [https://stackdiary.com/critical-vulnerability-in-webp-codec-cve-2023-4863/](https://stackdiary.com/critical-vulnerability-in-webp-codec-cve-2023-4863/)
- [https://www.bleepingcomputer.com/news/google/google-fixes-another-chrome-zero-day-bug-exploited-in-attacks/](https://www.bleepingcomputer.com/news/google/google-fixes-another-chrome-zero-day-bug-exploited-in-attacks/)
- [https://www.debian.org/security/2023/dsa-5496](https://www.debian.org/security/2023/dsa-5496)
- [https://www.debian.org/security/2023/dsa-5497](https://www.debian.org/security/2023/dsa-5497)
- [https://www.debian.org/security/2023/dsa-5498](https://www.debian.org/security/2023/dsa-5498)
- [https://www.mozilla.org/en-US/security/advisories/mfsa2023-40/](https://www.mozilla.org/en-US/security/advisories/mfsa2023-40/)
- [http://www.openwall.com/lists/oss-security/2023/09/21/4](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/2023/09/22/1)
- [http://www.openwall.com/lists/oss-security/2023/09/22/3](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/2023/09/22/4)
- [http://www.openwall.com/lists/oss-security/2023/09/22/5](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/2023/09/22/6)
- [http://www.openwall.com/lists/oss-security/2023/09/22/7](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/2023/09/22/8)
- [http://www.openwall.com/lists/oss-security/2023/09/26/1](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/2023/09/26/7)
- [http://www.openwall.com/lists/oss-security/2023/09/28/1](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/2023/09/28/2)
- [http://www.openwall.com/lists/oss-security/2023/09/28/4](http://www.openwall.com/lists/oss-security/2023/09/28/4)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2023-4863 · Markdown: https://rewindex.com/cve/CVE-2023-4863.md · JSON: https://rewindex.com/api/v1/cves/CVE-2023-4863 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:13:06.333Z