CVE-2023-4863

HIGHNVD 8.89.0▲

8.8

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 v3: 8.8
EG Score: 9.0(high)
EPSS: 99.8%
KEV: ⚠ Exploited

Published

September 12, 2023

Last Modified

October 24, 2025

References (92)

chrome-cve-admin@googlehttp://www.openwall.com/lists/oss-security/2023/09/21/4
chrome-cve-admin@googlehttp://www.openwall.com/lists/oss-security/2023/09/22/1
chrome-cve-admin@googlehttp://www.openwall.com/lists/oss-security/2023/09/22/3
chrome-cve-admin@googlehttp://www.openwall.com/lists/oss-security/2023/09/22/4
chrome-cve-admin@googlehttp://www.openwall.com/lists/oss-security/2023/09/22/5
chrome-cve-admin@googlehttp://www.openwall.com/lists/oss-security/2023/09/22/6
chrome-cve-admin@googlehttp://www.openwall.com/lists/oss-security/2023/09/22/7
chrome-cve-admin@googlehttp://www.openwall.com/lists/oss-security/2023/09/22/8
chrome-cve-admin@googlehttp://www.openwall.com/lists/oss-security/2023/09/26/1
chrome-cve-admin@googlehttp://www.openwall.com/lists/oss-security/2023/09/26/7
chrome-cve-admin@googlehttp://www.openwall.com/lists/oss-security/2023/09/28/1
chrome-cve-admin@googlehttp://www.openwall.com/lists/oss-security/2023/09/28/2
chrome-cve-admin@googlehttp://www.openwall.com/lists/oss-security/2023/09/28/4
chrome-cve-admin@googlehttps://adamcaudill.com/2023/09/14/whose-cve-is-it-anyway/
chrome-cve-admin@googlehttps://blog.isosceles.com/the-webp-0day/

Patch Availability(29)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	webp (1.2.2-2ubuntu0.22.04.2) @ jammy	2026-05-24	ubuntu
ubuntu	firefox-mozsymbols (117.0.1+build2-0ubuntu0.20.04.1) @ focal	2026-05-24	ubuntu
ubuntu	xul-ext-lightning (1:102.15.1+build1-0ubuntu0.23.04.1) @ lunar	2026-05-24	ubuntu
ubuntu	webp (0.6.1-2ubuntu0.18.04.2+esm1) @ bionic	2026-05-24	ubuntu
redhat	rhel9/thunderbird-flatpak:flatpak-9020020231006114109.1	2023-10-23	redhat
redhat	rhel9/firefox-flatpak:flatpak-9020020231006113910.2	2023-10-23	redhat
redhat	libwebp-0:1.0.0-8.el8_8.1	2023-09-20	redhat
redhat	libwebp-0:1.2.0-7.el9_2	2023-09-19	redhat
redhat	thunderbird-0:102.15.1-1.el9_0	2023-09-19	redhat
redhat	thunderbird-0:102.15.1-1.el9_2	2023-09-19	redhat
redhat	libwebp-0:1.0.0-5.2.el8_1.1	2023-09-19	redhat
redhat	libwebp-0:1.0.0-7.el8_4.1	2023-09-19	redhat
redhat	thunderbird-0:102.15.1-1.el8_8	2023-09-18	redhat
redhat	thunderbird-0:102.15.1-1.el8_4	2023-09-18	redhat
redhat	libwebp-0:1.0.0-7.el8_2.1	2023-09-18	redhat
redhat	firefox-0:102.15.1-1.el8_6	2023-09-18	redhat
redhat	firefox-0:102.15.1-1.el8_1	2023-09-18	redhat
redhat	libwebp-0:1.2.0-6.el9_0	2023-09-18	redhat
redhat	thunderbird-0:102.15.1-1.el8_6	2023-09-18	redhat
redhat	firefox-0:102.15.1-1.el8_8	2023-09-18	redhat
redhat	firefox-0:102.15.1-1.el7_9	2023-09-18	redhat
redhat	thunderbird-0:102.15.1-1.el7_9	2023-09-18	redhat
redhat	firefox-0:102.15.1-1.el8_2	2023-09-18	redhat
redhat	firefox-0:102.15.1-1.el9_2	2023-09-18	redhat
redhat	firefox-0:102.15.1-1.el9_0	2023-09-18	redhat
redhat	thunderbird-0:102.15.1-1.el8_1	2023-09-18	redhat
redhat	thunderbird-0:102.15.1-1.el8_2	2023-09-18	redhat
redhat	firefox-0:102.15.1-1.el8_4	2023-09-18	redhat
redhat	libwebp-0:1.0.0-7.el8_6.1	2023-09-18	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(13 across 5 ecosystems)

NuGet(7)

Package	Vulnerable range	Fixed in	Dependents
magick.net-q16-anycpu	10.0.0 ... 9.1.2 (184 versions)	13.3.0	—
magick.net-q16-hdri-anycpu	10.0.0 ... 9.1.2 (181 versions)	13.3.0	—
magick.net-q16-x64	10.0.0 ... 9.1.2 (200 versions)	13.3.0	—
magick.net-q8-anycpu	10.0.0 ... 9.1.2 (184 versions)	13.3.0	—
magick.net-q8-openmp-x64	10.0.0 ... 9.1.2 (81 versions)	13.3.0	—
magick.net-q8-x64	10.0.0 ... 9.1.2 (200 versions)	13.3.0	—
SkiaSharp	2.80.0 ... 2.88.5 (11 versions)	2.88.6	—

crates.io(3)

Package	Vulnerable range	Fixed in	Dependents
libwebp-sys	—	0.9.3	—
libwebp-sys2	—	0.1.8	—
webp	—	0.2.6	—

Go(1)

Package	Vulnerable range	Fixed in	Dependents
github.com/chai2010/webp	—	1.1.2-0.20250406010349-76805d5a8860	—

npm(1)

Package	Vulnerable range	Fixed in	Dependents
electron	—	27.0.0-beta.2	—

PyPI(1)

Package	Vulnerable range	Fixed in	Dependents
pillow	1.0 ... 9.5.0 (93 versions)	10.0.1	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-787Out-of-bounds Write

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 10× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 19:13 UTCkev_newly_listed
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-24 17:44 UTCEG score recompute
2026-05-24 17:44 UTCVendor advisory

Frequently asked(6)

What is CVE-2023-4863?

CVE-2023-4863 is a high vulnerability published on September 12, 2023. 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)

When was CVE-2023-4863 disclosed?

CVE-2023-4863 was first published in the National Vulnerability Database on September 12, 2023, with the most recent update on October 24, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-4863 actively exploited?

Yes. CISA added CVE-2023-4863 to the Known Exploited Vulnerabilities catalog on September 13, 2023, affecting Google Chromium WebP. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.

What is the CVSS score of CVE-2023-4863?

CVE-2023-4863 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.

Which products are affected by CVE-2023-4863?

CVE-2023-4863 affects Google Chromium WebP. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.

How do I remediate CVE-2023-4863?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-4863, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-4863

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Is Your Infrastructure Affected by CVE-2023-4863?

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CVE-2023-4863

Published

Last Modified

References (92)

Patch Availability(29)

Affected Packages

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(6)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-4863?

Same vendor

Same CWE

CVE-2023-4863

📅 Published

🔄 Last Modified

🔗 References (92)

Patch Availability(29)

Affected Packages

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(6)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-4863?

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References (92)

Frequently asked(6)

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