CVE-2023-4863
HighExploitedPublic exploitlibwebp: OOB write in BuildHuffmanTable
Published Sep 12, 2023 · Updated Oct 14, 2026 · Also known as A-299477569, ALPINE-CVE-2023-4863, ASB-A-299477569, DEBIAN-CVE-2023-4863, DLA-3568-1, DLA-3569-1, DLA-3570-1, DSA-5496-1, DSA-5497-1, DSA-5497-2, DSA-5498-1, GHSA-j7hp-h8jx-5ppr, JLSEC-2026-441, MFSA 2023-40, PYSEC-2026-1794, ROOT-APP-PYPI-CVE-2023-4863, RUSTSEC-2023-0060, RUSTSEC-2023-0061, SUSE-SU-2023:3609-1, SUSE-SU-2023:3610-1, SUSE-SU-2023:3626-1, SUSE-SU-2023:3634-1, SUSE-SU-2023:3794-1, SUSE-SU-2023:3829-1, UBUNTU-CVE-2023-4863, USN-6367-1, USN-6369-1, USN-6369-2
Key Facts
Patch immediately- CVE-2023-4863 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Honeyview (Bandisoft), Seequent Leapfrog (Bentley), Chrome (Google) and 22 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 6, 2023. Public exploit code is available.
- EPSS estimates a 100% probability of exploitation in the next 30 days.
- Fixed versions are available, including afl 5.00c-1.1, afl-devel 5.00c-1.1, Honeyview 5.51.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
100%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2023-4863 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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)
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Sep 13, 2023 | Oct 4, 2023 | Not reported |
| Industry KEV feed | Sep 6, 2023 | Oct 4, 2023 | Not reported |
| CIRCL KEV | Sep 13, 2023 | Oct 4, 2023 | Not reported |
| ENISA EUVD | Sep 13, 2023 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
560 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| HoneyviewBandisoft | See advisory | 5.51 |
| Seequent LeapfrogBentley | See advisory | 2023.2 |
| ChromeGoogle | >= 116.0.5845.187 | 116.0.5845.187 |
| Edge ChromiumMicrosoft | See advisory | 116.0.1938.81 |
| TeamsMicrosoft | See advisory | 1.6.00.26474 |
Patched Releases
afl
5.00c-1.1
afl-devel
5.00c-1.1
Honeyview
5.51
Seequent Leapfrog
2023.2
Chrome
116.0.5845.187
chromedriver
116.0.5845.187-1.1, 116.0.5845.187-bp155.2.31.1, 116.0.5845.187-bp155.2.34.1
chromium
116.0.5845.187-1.1, 116.0.5845.187-bp155.2.31.1, 116.0.5845.187-bp155.2.34.1, 116.0.5845.187-r0, 116.0.5845.96-1.ph4, 117.0.5938.62-1, 119.0.6045.176-1.ph5
electron
22.3.24, 24.8.3, 25.8.1, 26.2.1, 27.0.0-beta.2
element-desktop
1.11.43-1.1
Firefox
0:102.15.1-1.el7_9, 0:102.15.1-1.el8_6, 0:102.15.1-1.el9_0, 102.15.1-1.0.1.el7_9, 102.15.1-1.0.1.el8_8, 102.15.1-1.0.1.el9_2, 102.15.1-1.el8_8, 102.15.1-1.el8_8.alma, 102.15.1-1.el9_2.alma, 117.0.1-1, 117.0.1+build2-0ubuntu0.20.04.1, 102.15.1, 117.0.1
firefox-esr
102.15.1esr-1~deb10u1, 102.15.1esr-1~deb11u1, 102.15.1esr-1~deb12u1, 115.2.1-r0, 115.2.1esr-1, 117.0.1-r0, 128.5.1-1.1
firefox-esr-branding-upstream
128.5.1-1.1
firefox-esr-translations-common
128.5.1-1.1
firefox-esr-translations-other
128.5.1-1.1
firefox-x11
102.15.1-1.0.1.el9_2
github.com/chai2010/webp
0.0.0-20250406010349-76805d5a8860, 1.1.2-0.20250406010349-76805d5a8860, 1.4.0
libmozjs-102-0
102.15.1-1.1
libmozjs-115-0
115.2.1-1.1
libopencv_aruco408
4.8.1-1.1
libopencv_face408
4.8.1-1.1
libopencv_gapi408
4.8.1-1.1
libopencv_highgui408
4.8.1-1.1
libopencv_imgcodecs408
4.8.1-1.1
libopencv_objdetect408
4.8.1-1.1
libopencv_optflow408
4.8.1-1.1
Timeline
Added to Industry KEV feed
Sep 6, 2023
Publicly disclosed
Sep 12, 2023
Added to CISA KEV
Sep 13, 2023
Added to CIRCL KEV
Sep 13, 2023
Added to ENISA EUVD
Sep 13, 2023
Last updated
Oct 14, 2026
Weakness Type
- CWE-122 Heap-based Buffer Overflow
- CWE-787 Out-of-bounds Write
References
- advisoryRHBA-2023:5988
- advisoryRHBA-2023:6004
- advisoryRHSA-2023:5183
- advisoryRHSA-2023:5184
- advisoryRHSA-2023:5185
FAQ
Common Questions.
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.
Affected: Honeyview (Bandisoft); Seequent Leapfrog (Bentley); Chrome (Google) versions >= 116.0.5845.187, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 6, 2023.
Yes. It was added on Sep 13, 2023 with a federal remediation due date of Oct 4, 2023.
Public exploit code is available.
Fixed versions are available, including afl 5.00c-1.1, afl-devel 5.00c-1.1, Honeyview 5.51.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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