Google Chromium WebP Heap-Based Buffer Overflow Vulnerability
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)
What happened
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)
CISA lists it as exploited, added 13 Sep 2023.
Does it affect you
Names Google Chrome, Mozilla Firefox. Enter the product and version you run to place it against the affected range the vendor published.
What to do
- Follow the vendor advisory for the fixed release and any interim mitigation.
chromereleases.googleblog.com - Follow the vendor advisory for the fixed release and any interim mitigation.
crbug.com - Follow the vendor advisory for the fixed release and any interim mitigation.
en.bandisoft.com - Apply the vendor patch named in this advisory.
github.com - Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
cisa.gov
CISA’s notes for this entry:
Affected, as published to NVD
- chrome
- Google Chrome: everything below 116.0.5845.187
- firefox
- Mozilla Firefox: everything below 102.15.1
The record
- NVD status
- Analyzed
- Published
- 12 Sep 2023, last modified 17 Jun 2026 (NVD)
- Severity
- CVSS 3.1 base score 8.8, High — computed here from the vector; NVD states 8.8.
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness
- CWE-787 Out-of-bounds Write (NVD; names by MITRE)
- Exploitation
- Listed in CISA’s Known Exploited Vulnerabilities catalogue since 13 Sep 2023; federal remediation due 04 Oct 2023. CISA entry
- Exploit probability
- EPSS 100.0%, 100th percentile — FIRST, scored 23 Oct 2026. FIRST EPSS
- Vendor
- Google · Chromium WebP (CISA)
References on the NVD record
- chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.htmlVendor Advisory
- crbug.com/1479274Issue TrackingVendor Advisory
- github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17aPatch
- msrc.microsoft.com/update-guide/vulnerability/CVE-2023-4863PatchThird Party Advisory
- en.bandisoft.com/honeyview/history/Release Notes
- github.com/webmproject/libwebp/releases/tag/v1.3.2Release Notes
- adamcaudill.com/2023/09/14/whose-cve-is-it-anyway/Third Party Advisory
- blog.isosceles.com/the-webp-0day/ExploitThird Party Advisory
- bugzilla.suse.com/show_bug.cgi?id=1215231Issue TrackingThird Party Advisory
- lists.debian.org/debian-lts-announce/2023/09/msg00015.htmlMailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2023/09/msg00016.htmlMailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2023/09/msg00017.htmlMailing ListThird Party Advisory
- news.ycombinator.com/item?id=37478403ExploitThird Party Advisory
- security-tracker.debian.org/tracker/CVE-2023-4863Issue TrackingThird Party Advisory
- security.gentoo.org/glsa/202309-05Third Party Advisory
- security.gentoo.org/glsa/202401-10Third Party Advisory
- security.netapp.com/advisory/ntap-20230929-0011/Third Party Advisory
- stackdiary.com/critical-vulnerability-in-webp-codec-cve-2023-4863/ExploitThird Party Advisory
- bentley.com/advisories/be-2023-0001/Third Party Advisory
- bleepingcomputer.com/news/google/google-fixes-another-chrome-zero-day-bug-exploited-in-attacks/Third Party Advisory
Sources
The verdict above is computed from the products and versions you entered and the affected ranges the vendor published to NVD. It does not inspect your environment, and this site never reports a product as unaffected: why.