High 8.8Known exploited (CISA KEV)Published Sep 12, 2023

CVE-2023-4863Heap 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.

Updated under an hour ago (2026-10-19 08:20 UTC)

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It affects Google Chrome and 12 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Sep 13, 2023; federal agencies had to remediate by Oct 4, 2023. Treat that date as your deadline.

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Exploited in the last 30 days

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: 8.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-787
Known exploited: Added to CISA KEV Sep 13, 2023; federal remediation due Oct 4, 2023Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 99.98% (percentile 100)
Assigned by: Chrome
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Google Chrome google:chrome (from the name)	from 116.0.5845.187 before 116.0.5845.187	CNA record
Google libwebp google:libwebp (from the name)	from 1.3.2 before 1.3.2	CNA record
google chrome google:chrome	before 116.0.5845.187	NVD
fedoraproject fedora fedoraproject:fedora	37; 38; 39	NVD
debian debian_linux debian:debian_linux	10.0; 11.0; 12.0	NVD
mozilla firefox mozilla:firefox	before 102.15.1; before 117.0.1; from 115.1.0 before 115.2.1	NVD
mozilla thunderbird mozilla:thunderbird	before 102.15.1; from 115.0 before 115.2.2	NVD
microsoft edge_chromium microsoft:edge_chromium	before 116.0.1938.81	NVD
microsoft teams microsoft:teams	before 1.6.00.26463; before 1.6.00.26474	NVD
microsoft webp_image_extension microsoft:webp_image_extension	before 1.0.62681.0	NVD
webmproject libwebp webmproject:libwebp	before 1.3.2	NVD
netapp active_iq_unified_manager netapp:active_iq_unified_manager	all versions	NVD
bentley seequent_leapfrog bentley:seequent_leapfrog	before 2023.2	NVD
bandisoft honeyview bandisoft:honeyview	before 5.51	NVD

References

https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.htmlvendor-advisory
https://crbug.com/1479274issue-tracking, vendor-advisory
https://en.bandisoft.com/honeyview/history/release-notes
https://stackdiary.com/critical-vulnerability-in-webp-codec-cve-2023-4863/
https://www.mozilla.org/en-US/security/advisories/mfsa2023-40/
https://github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17apatch
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-4863
https://security-tracker.debian.org/tracker/CVE-2023-4863
https://bugzilla.suse.com/show_bug.cgi?id=1215231issue-tracking, third-party-advisory
https://news.ycombinator.com/item?id=37478403
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-5497
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/FYYKLG6CRGEDTNRBSU26EEWAO6D6U645/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PYZV7TMKF4QHZ54SFJX54BDN52VHGGCX/
https://lists.debian.org/debian-lts-announce/2023/09/msg00015.htmlmailing-list, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WHOLML7N2G5KCAZXFWC5IDFFHSQS5SDB/
https://www.debian.org/security/2023/dsa-5498
https://security.gentoo.org/glsa/202309-05
https://lists.debian.org/debian-lts-announce/2023/09/msg00016.htmlmailing-list, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6T655QF7CQ3DYAMPFV7IECQYGDEUIVVT/mailing-list
https://adamcaudill.com/2023/09/14/whose-cve-is-it-anyway/third-party-advisory
https://github.com/webmproject/libwebp/releases/tag/v1.3.2release-notes
https://lists.debian.org/debian-lts-announce/2023/09/msg00017.htmlmailing-list, third-party-advisory
http://www.openwall.com/lists/oss-security/2023/09/21/4mailing-list
http://www.openwall.com/lists/oss-security/2023/09/22/1mailing-list
http://www.openwall.com/lists/oss-security/2023/09/22/3mailing-list
http://www.openwall.com/lists/oss-security/2023/09/22/4mailing-list
http://www.openwall.com/lists/oss-security/2023/09/22/5mailing-list
http://www.openwall.com/lists/oss-security/2023/09/22/6mailing-list
http://www.openwall.com/lists/oss-security/2023/09/22/7mailing-list
http://www.openwall.com/lists/oss-security/2023/09/22/8mailing-list
http://www.openwall.com/lists/oss-security/2023/09/26/1mailing-list
http://www.openwall.com/lists/oss-security/2023/09/26/7mailing-list
http://www.openwall.com/lists/oss-security/2023/09/28/1mailing-list
http://www.openwall.com/lists/oss-security/2023/09/28/2mailing-list
http://www.openwall.com/lists/oss-security/2023/09/28/4mailing-list
https://blog.isosceles.com/the-webp-0day/exploit, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.