GHSA-f9pm-4g9p-6vm3 is a high-severity (CVSS 8.8) remote code execution vulnerability in webp. A fix is available for webp — see the affected versions and patch details below.
Bundled libwebp in pywebp vulnerable
Real-World Exposure
webpReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Impact
pywebp versions before v0.3.0 bundled libwebp binaries in wheels that are vulnerable to CVE-2023-4863. The vulnerability was a heap buffer overflow which allowed a remote attacker to perform an out of bounds memory write.
Patches
The problem has been patched upstream in libwebp 1.3.2. pywebp was updated to bundle a patched version of libwebp in v0.3.0.
Workarounds
No known workarounds without upgrading.
References
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | webp | all versions | 0.3.0pip install --upgrade 'webp==0.3.0' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for webp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update webp to 0.3.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-f9pm-4g9p-6vm3 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 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-f9pm-4g9p-6vm3 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-f9pm-4g9p-6vm3. 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-f9pm-4g9p-6vm3 in your dependencies?
O3 Security finds GHSA-f9pm-4g9p-6vm3 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.