`CVE-2023-4863`

Affected software	10 products, listed below
Severity	8.8 High CVSS 3.1 2 scores
Weakness	Out-of-bounds write (CWE-787)
Published	12 Sep 2023
Updated	17 Jun 2026

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)

Exploitation status

Exploited

Confirmed real-world exploitation.

CISA KEV listed Confirmed exploitation in the wild. Added 2023-09-13 · remediation due 2023-10-04 · ransomware use: unknown
VulnCheck KEV listed Exploitation reported in the wild. 9 citations · 3 exploits · earliest 2023-09-06.
CISA Vulnrichment exploitation: active CISA records active exploitation. Automatable: no, technical impact: total.
Indexed PoC 13 indexed Published artifacts you can open, in GitHub PoC; first seen 2023-09-21.
EPSS 99.9% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99.9% of all scored CVEs.

VulnCheck KEV

Exploitation evidence from VulnCheck Known Exploited Vulnerabilities (VulnCheck KEV), used under VulnCheck's community terms. View CVE-2023-4863 in VulnCheck (free account), which lists 4 more citations not shown here.

Evidence	Source	Detail	Date
Reported exploitation	docs.google.com	/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit	2023-09-06
Reported exploitation	chromereleases.googleblog.com	/2023/09/stable-channel-update-for-desktop_11.html	2023-09-11
Reported exploitation	api.msrc.microsoft.com	/cvrf/v3.0/cvrf/2023-Sep	2023-09-12
Reported exploitation	cisa.gov	/sites/default/files/feeds/known_exploited_vulnerabilities.json	2023-09-13
Reported exploitation	ti.qianxin.com	/uploads/2024/02/02/dcc93e586f9028c68e7ab34c3326ff31.pdf	2024-02-02
Exploit reference	VulnCheck XDB 6ae5ac416de8	Exploit type: client-side	2023-09-21
Exploit reference	VulnCheck XDB e14284c48cde	Exploit type: client-side	2023-12-19
Exploit reference	VulnCheck XDB fa516a5e03df	Exploit type: client-side	2026-04-22

Evidence

Source

Detail

Date

Reported exploitation

docs.google.com

/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit

2023-09-06

Reported exploitation

chromereleases.googleblog.com

/2023/09/stable-channel-update-for-desktop_11.html

2023-09-11

Reported exploitation

api.msrc.microsoft.com

/cvrf/v3.0/cvrf/2023-Sep

2023-09-12

Reported exploitation

cisa.gov

/sites/default/files/feeds/known_exploited_vulnerabilities.json

2023-09-13

Reported exploitation

ti.qianxin.com

/uploads/2024/02/02/dcc93e586f9028c68e7ab34c3326ff31.pdf

2024-02-02

Exploit reference

VulnCheck XDB 6ae5ac416de8

Exploit type: client-side

2023-09-21

Exploit reference

VulnCheck XDB e14284c48cde

Exploit type: client-side

2023-12-19

Exploit reference

VulnCheck XDB fa516a5e03df

Exploit type: client-side

2026-04-22

3 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

Index	Artifact	Stars	First seen
GitHub PoC	mistymntncop/CVE-2023-4863	320	2023-09-21
GitHub PoC	LiveOverflow/webp-CVE-2023-4863	55	2023-12-18
GitHub PoC	This tool calculates tricky canonical huffman histogram for CVE-2023-4863.	25	2023-12-19
GitHub PoC	A tool for finding vulnerable libwebp(CVE-2023-4863)	21	2023-10-05
GitHub PoC	Find Electron Apps Vulnerable to CVE-2023-4863 / CVE-2023-5129	6	2023-09-30
GitHub PoC	bbaranoff/CVE-2023-4863	6	2023-09-25
GitHub PoC	Scans an executable and determines if it was wrapped in an Electron version vulnerable to the Chromium vulnerability CVE-2023-4863/ CVE-2023-5129	5	2023-09-29
GitHub PoC	huiwen-yayaya/CVE-2023-4863	4	2023-11-11
GitHub PoC	BAD-WEBP-CVE-2023-4863	3	2023-09-25
GitHub PoC	Shcesama/cve-2023-4863-analysis	2	2026-06-03

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

Protection none
Action not pursued none
Review human Researcher
Record active

Decided by	Manual classification of this CVE in the legacy dataset
Finding	A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

Decided by

Manual classification of this CVE in the legacy dataset

Finding

A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

8.8 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

Version Score Band Vector Assigner Type

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 NVD Primary published

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 CISA-ADP Secondary

Version	Score	Band	Vector	Assigner	Type
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`	NVD	Primary	published
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`	CISA-ADP	Secondary

Affected software and releases

Oracle advisories

Advisory	Type	Quarter	Products Oracle names in its risk matrix
Oracle Critical Patch Update April 2024 ↗	CPU	2024-Q2	Oracle Communications / Platform (libwebp) (9.0.0.0)

Advisory

Type

Quarter

Products Oracle names in its risk matrix

Oracle Critical Patch Update April 2024 ↗

CPU

2024-Q2

Oracle Communications / Platform (libwebp) (9.0.0.0)

Oracle components and versions

Family	Component	Versions, as Oracle lists them	Read as
Oracle Communications	Platform (libwebp)	9.0.0.0	9.0.0.0

Family

Component

Versions, as Oracle lists them

Read as

Oracle Communications

Platform (libwebp)

9.0.0.0

Products and versions

12 products, 20 version entries

Source	Vendor	Product	Scheme	Affected versions
nvd	bandisoft	honeyview	generic	＜ 5.51
nvd	bentley	seequent leapfrog	generic	＜ 2023.2
nvd	debian	debian linux	generic	10.0 · 11.0 · 12.0
nvd	fedoraproject	fedora	generic	37 · 38 · 39
nvd	google	chrome	generic	＜ 116.0.5845.187
nvd	microsoft	edge chromium	generic	＜ 116.0.1938.81
nvd	microsoft	teams	generic	＜ 1.6.0.26463 · ＜ 1.6.0.26474
nvd	microsoft	webp image extension	generic	＜ 1.0.62681.0
nvd	mozilla	firefox	generic	＜ 102.15.1 · ≥ 115.1.0 and ＜ 115.2.1 · ＜ 117.0.1
nvd	mozilla	thunderbird	generic	＜ 102.15.1 · ≥ 115.0 and ＜ 115.2.2
nvd	netapp	active iq unified manager	generic	any version
nvd	webmproject	libwebp	generic	＜ 1.3.2

Source

Vendor

Product

Scheme

Affected versions

nvd

bandisoft

honeyview

generic

＜ 5.51

nvd

bentley

seequent leapfrog

generic

＜ 2023.2

nvd

debian

debian linux

generic

10.0 · 11.0 · 12.0

nvd

fedoraproject

fedora

generic

37 · 38 · 39

nvd

google

chrome

generic

＜ 116.0.5845.187

nvd

microsoft

edge chromium

generic

＜ 116.0.1938.81

nvd

microsoft

teams

generic

＜ 1.6.0.26463 · ＜ 1.6.0.26474

nvd

microsoft

webp image extension

generic

＜ 1.0.62681.0

nvd

mozilla

firefox

generic

＜ 102.15.1 · ≥ 115.1.0 and ＜ 115.2.1 · ＜ 117.0.1

nvd

mozilla

thunderbird

generic

＜ 102.15.1 · ≥ 115.0 and ＜ 115.2.2

nvd

netapp

active iq unified manager

generic

any version

nvd

webmproject

libwebp

generic

＜ 1.3.2

References

URL	Tags
https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.html?m=1
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

URL

Timeline

VulnCheck KEV: earliest evidence	2023-09-06	Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.
Published	2023-09-12	By the CVE Program.
Added to CISA KEV	2023-09-13	Listed in CISA's Known Exploited Vulnerabilities catalog.
VulnCheck KEV: latest evidence	2026-04-22	Date of the newest report, exploit reference or honeypot sighting in VulnCheck KEV's record.
NVD record modified	2026-06-17	NVD's own last-modified date for this record.

VulnCheck KEV: earliest evidence

2023-09-06

Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.

Published

2023-09-12

By the CVE Program.

Added to CISA KEV

2023-09-13

Listed in CISA's Known Exploited Vulnerabilities catalog.

VulnCheck KEV: latest evidence

2026-04-22

Date of the newest report, exploit reference or honeypot sighting in VulnCheck KEV's record.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

How VRT decided (5 of 24 rules ran)

5 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file no match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no match An ARMR security-rule template on disk for this CVE

4 manual-classification no match A researcher's recorded decision for this specific CVE

5 manual classification decided it matched Outside Waratek scope Found in legacy manual classifications

6 non-java-upstream not reached A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component not reached The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side not reached Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven not reached An OSV.dev record of this CVE affecting a package published to Maven Central. When every such package is one business applications do not use (Minecraft mods and launchers, Fastjson) and no tracked product is named by CPE, it settles the CVE as Outside Waratek scope instead

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint not reached A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven not reached The affected package being open source on Maven, so the fix can be read

19 poc-derivable not reached An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit not reached Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match not reached A vulnerability class already blocked by an ARMR security rule

22 exploited-no-fix-or-poc not reached Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold not reached Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory

24 no-exploit-published not reached Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all

NVD ↗ · CVE.org ↗