CVEs / CVE-2023-4863

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

Known exploited in the CISA KEV catalog since 13 Sep 2023
high 8.8 CVSS 3.1 (NVD)
EPSS 99.9% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
Last changed at its sources 28 Oct 2026

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Summary

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, Known Exploited Vulnerabilities catalog

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)
The CVE record, via NVD · published 12 Sep 2023 · NVD status: Analyzed

Affected and fixed versions

As stated by the CVE record (from the CNA)
Product	Affected	Fixed in
Google Chrome	from 116.0.5845.187, before 116.0.5845.187	116.0.5845.187
Google libwebp	from 1.3.2, before 1.3.2	1.3.2

As stated by OSV
Product	Affected	Fixed in
libwebp-sys2 (crates.io)	before 0.1.8	0.1.8
libwebp-sys (crates.io)	before 0.9.3	0.9.3
electron (npm)	from 22.0.0, before 22.3.24	22.3.24
electron (npm)	from 24.0.0, before 24.8.3	24.8.3
electron (npm)	from 25.0.0, before 25.8.1	25.8.1
electron (npm)	from 26.0.0, before 26.2.1	26.2.1
electron (npm)	from 27.0.0-beta.1, before 27.0.0-beta.2	27.0.0-beta.2
SkiaSharp (NuGet)	from 2.0.0, before 2.88.6	2.88.6
github.com/chai2010/webp (Go)	from 1.1.2, before 1.4.0	1.4.0
pillow (PyPI)	before 10.0.1	10.0.1
webp (crates.io)	before 0.2.6	0.2.6
magick.net-q16-anycpu (NuGet)	before 13.3.0	13.3.0
magick.net-q16-hdri-anycpu (NuGet)	before 13.3.0	13.3.0
magick.net-q16-x64 (NuGet)	before 13.3.0	13.3.0
magick.net-q8-anycpu (NuGet)	before 13.3.0	13.3.0
magick.net-q8-openmp-x64 (NuGet)	before 13.3.0	13.3.0
magick.net-q8-x64 (NuGet)	before 13.3.0	13.3.0
github.com/chai2010/webp (Go)	before 0.0.0-20250406010349-76805d5a8860	0.0.0-20250406010349-76805d5a8860
github.com/chai2010/webp (Go)	from 0.0.0, before 1.1.2-0.20250406010349-76805d5a8860	1.1.2-0.20250406010349-76805d5a8860

Package versions from GHSA-j7hp-h8jx-5ppr.

Exploitation

In CISA KEV since	13 Sep 2023
Due date for US federal agencies	4 Oct 2023
Used in ransomware campaigns	Unknown
Required action	Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Severity

CVSS 3.1	8.8 high `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H` Scored by NVD
Weakness	CWE-787

References

CVE-2023-4863 on NVD
CVE-2023-4863 in the CISA KEV catalog
https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.html?m=1 (cited by CISA)
CVE-2023-4863 on OSV
http://www.openwall.com/lists/oss-security/2023/09/21/4 Mailing List
http://www.openwall.com/lists/oss-security/2023/09/22/1 Mailing List
http://www.openwall.com/lists/oss-security/2023/09/22/3 Mailing List
http://www.openwall.com/lists/oss-security/2023/09/22/4 Mailing List
http://www.openwall.com/lists/oss-security/2023/09/22/5 Mailing List
http://www.openwall.com/lists/oss-security/2023/09/22/6 Mailing List
http://www.openwall.com/lists/oss-security/2023/09/22/7 Mailing List
http://www.openwall.com/lists/oss-security/2023/09/22/8 Mailing List
http://www.openwall.com/lists/oss-security/2023/09/26/1 Mailing List
http://www.openwall.com/lists/oss-security/2023/09/26/7 Mailing List
http://www.openwall.com/lists/oss-security/2023/09/28/1 Mailing List
http://www.openwall.com/lists/oss-security/2023/09/28/2 Mailing List
http://www.openwall.com/lists/oss-security/2023/09/28/4 Mailing List
https://adamcaudill.com/2023/09/14/whose-cve-is-it-anyway/ Third Party Advisory
https://blog.isosceles.com/the-webp-0day/ Exploit, Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1215231 Issue Tracking, Third Party Advisory
https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.html Vendor Advisory
https://crbug.com/1479274 Issue Tracking, Vendor Advisory
https://en.bandisoft.com/honeyview/history/ Release Notes
https://github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17a Patch

Sources

Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.

This product uses data from the NVD API but is not endorsed or certified by the NVD.