CVE-2023-4863
Google Chromium WebP Heap-Based Buffer Overflow Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA notes
https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.html?m=1; https://nvd.nist.gov/vuln/detail/CVE-2023-4863
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)
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitation Context
as of October 13, 2026- CISA added CVE-2023-4863 to the KEV catalog 1 day after its CVE record was published. The median for entries added in 2023 is 12 days.
- It is one of 75 Google entries in the CISA KEV catalog, and one of 7 added in 2023.
- Its current EPSS score (100.0%) is higher than that of 95% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
Google Chrome | 116.0.5845.187 to <116.0.5845.187 | |
Google libwebp | 1.3.2 to <1.3.2 |
References
46 Links- https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.html
- https://crbug.com/1479274
- https://en.bandisoft.com/honeyview/history/
- https://stackdiary.com/critical-vulnerability-in-webp-codec-cve-2023-4863/
- https://www.mozilla.org/en-US/security/advisories/mfsa2023-40/
- https://github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17a
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-4863
- https://security-tracker.debian.org/tracker/CVE-2023-4863
- https://bugzilla.suse.com/show_bug.cgi?id=1215231
- https://news.ycombinator.com/item?id=37478403
- https://www.bleepingcomputer.com/news/google/google-fixes-another-chrome-zero-day-bug-exploited-in-attacks/
- https://www.debian.org/security/2023/dsa-5496
- https://www.debian.org/security/2023/dsa-5497
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OZDGWWMJREPAGKWCJKSCM4WYLANSKIFX/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FYYKLG6CRGEDTNRBSU26EEWAO6D6U645/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PYZV7TMKF4QHZ54SFJX54BDN52VHGGCX/
- https://lists.debian.org/debian-lts-announce/2023/09/msg00015.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WHOLML7N2G5KCAZXFWC5IDFFHSQS5SDB/
- https://www.debian.org/security/2023/dsa-5498
- https://security.gentoo.org/glsa/202309-05
- https://lists.debian.org/debian-lts-announce/2023/09/msg00016.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6T655QF7CQ3DYAMPFV7IECQYGDEUIVVT/
- https://adamcaudill.com/2023/09/14/whose-cve-is-it-anyway/
- https://github.com/webmproject/libwebp/releases/tag/v1.3.2
- https://lists.debian.org/debian-lts-announce/2023/09/msg00017.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KUQ7CTX3W372X3UY56VVNAHCH6H2F4X3/
- http://www.openwall.com/lists/oss-security/2023/09/21/4
- https://blog.isosceles.com/the-webp-0day/
- http://www.openwall.com/lists/oss-security/2023/09/22/1
- http://www.openwall.com/lists/oss-security/2023/09/22/3
- http://www.openwall.com/lists/oss-security/2023/09/22/4
- http://www.openwall.com/lists/oss-security/2023/09/22/5
- http://www.openwall.com/lists/oss-security/2023/09/22/8
- http://www.openwall.com/lists/oss-security/2023/09/22/7
- http://www.openwall.com/lists/oss-security/2023/09/22/6
- http://www.openwall.com/lists/oss-security/2023/09/26/1
- http://www.openwall.com/lists/oss-security/2023/09/26/7
- http://www.openwall.com/lists/oss-security/2023/09/28/1
- http://www.openwall.com/lists/oss-security/2023/09/28/2
- http://www.openwall.com/lists/oss-security/2023/09/28/4
- https://security.netapp.com/advisory/ntap-20230929-0011/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WTRUIS3564P7ZLM2S2IH4Y4KZ327LI4I/
- https://sethmlarson.dev/security-developer-in-residence-weekly-report-16
- https://www.bentley.com/advisories/be-2023-0001/
- https://security.gentoo.org/glsa/202401-10
- https://www.vicarius.io/vsociety/posts/zero-day-webp-vulnerability-cve-2023-4863
Record Details
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Google Chromium V8 Type Confusion Vulnerability
Google Chromium V8 Type Confusion Vulnerability
WebRTC Heap Buffer Overflow Vulnerability
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