Known exploited vulnerability
CVE-2023-4863
The short answer
CVE-2023-4863 affects Google Chrome and is rated high (CVSS 8.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2023-09-13: attackers are using it, so patch it first. Fixed versions are published for libwebp-sys2 (0.1.8) and libwebp-sys (0.9.3).
What it is
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)
Weakness: CWE-787.
Severity
8.8 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Sep 13, 2023
Federal due date Oct 4, 2023
EPSS, next 30 days
100%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected packages and fixed versions
| Package | Ecosystem | Fixed in | Advisory |
|---|---|---|---|
| libwebp-sys2 | crates.io | 0.1.8 | GHSA-j7hp-h8jx-5ppr |
| libwebp-sys | crates.io | 0.9.3 | GHSA-j7hp-h8jx-5ppr |
| electron | npm | 22.3.24, 24.8.3, 25.8.1, 26.2.1, 27.0.0-beta.2 | GHSA-j7hp-h8jx-5ppr |
| SkiaSharp | NuGet | 2.88.6 | GHSA-j7hp-h8jx-5ppr |
| github.com/chai2010/webp | Go | 1.4.0, 0.0.0-20250406010349-76805d5a8860, 1.1.2-0.20250406010349-76805d5a8860 | GHSA-j7hp-h8jx-5ppr |
| pillow | PyPI | 10.0.1 | GHSA-j7hp-h8jx-5ppr |
| webp | crates.io | 0.2.6 | GHSA-j7hp-h8jx-5ppr |
| magick.net-q16-anycpu | NuGet | 13.3.0 | GHSA-j7hp-h8jx-5ppr |
| magick.net-q16-hdri-anycpu | NuGet | 13.3.0 | GHSA-j7hp-h8jx-5ppr |
| magick.net-q16-x64 | NuGet | 13.3.0 | GHSA-j7hp-h8jx-5ppr |
| magick.net-q8-anycpu | NuGet | 13.3.0 | GHSA-j7hp-h8jx-5ppr |
| magick.net-q8-openmp-x64 | NuGet | 13.3.0 | GHSA-j7hp-h8jx-5ppr |
| magick.net-q8-x64 | NuGet | 13.3.0 | GHSA-j7hp-h8jx-5ppr |
Is it in your code? Drop your lockfile into the free vulnerability check, or let vulnerability watch check your repository every day and open the upgrade as a pull request.
Affected products
Chrome, libwebp. NVD's record lists the exact affected versions.
References
- 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=1215231 Issue TrackingThird Party Advisory
- chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.html Vendor Advisory
- crbug.com/1479274 Issue TrackingVendor Advisory
- en.bandisoft.com/honeyview/history/ Release Notes
- github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17a Patch
- github.com/webmproject/libwebp/releases/tag/v1.3.2 Release Notes
- lists.debian.org/debian-lts-announce/2023/09/msg00015.html Mailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2023/09/msg00016.html Mailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2023/09/msg00017.html Mailing ListThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6T655QF7CQ3DYAMPFV7IECQYGDEUIVVT/ Mailing List
Questions
Is CVE-2023-4863 being exploited?
Yes. CISA added CVE-2023-4863 to its Known Exploited Vulnerabilities catalog on 2023-09-13, with a federal remediation due date of 2023-10-04.
How do I fix CVE-2023-4863?
Upgrade to a fixed version: libwebp-sys2 (crates.io) 0.1.8; libwebp-sys (crates.io) 0.9.3; electron (npm) 22.3.24 or 24.8.3 or 25.8.1 or 26.2.1 or 27.0.0-beta.2; SkiaSharp (NuGet) 2.88.6. CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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