GHSA-j646-gj5p-p45g
CefSharp affected by heap buffer overflow in WebP
Blast Radius
CefSharp.Common.NETCefSharp.Common.NETCoreReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.
Description
Google is aware that an exploit for CVE-2023-4863 exists in the wild.
Description
Heap buffer overflow in WebP in Google Chrome prior to 116.0.5845.187 allowed a remote attacker to perform an out of bounds memory write via a crafted HTML page. (Chromium security severity: Critical)
References
- https://www.cve.org/CVERecord?id=CVE-2023-4863
- https://nvd.nist.gov/vuln/detail/CVE-2023-4863
- https://www.techtarget.com/searchsecurity/news/366551978/Browser-companies-patch-critical-zero-day-vulnerability
Updated
There is another related security vulnerability.
There's another related CVE (CVE-2023-5217) that is fixed in Chromium 117.0.5938.132. This one is triggered by WebCodecs API encoder usage, so a workaround for older versions is to disable the WebCodecs API (
--disable-blink-features=WebCodecs).
As per https://magpcss.org/ceforum/viewtopic.php?f=6&t=19551#p54150
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | CefSharp.Common | all versions | 116.0.230 |
| .NETNuGet | CefSharp.Common.NETCore | all versions | 116.0.230 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for CefSharp.Common. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update CefSharp.Common to 116.0.230 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-j646-gj5p-p45g is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-j646-gj5p-p45g is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-j646-gj5p-p45g. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-j646-gj5p-p45g in your dependencies?
O3 detects GHSA-j646-gj5p-p45g across NuGet dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.