GHSA-g4m4-9q4c-mfw6 is a high-severity (CVSS 7.1) vulnerability in fiona. A fix is available for fiona — see the affected versions and patch details below.
Fiona affected by CVE-2020-14152 related to madler-zlib
Real-World Exposure
fionaReal-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
Summary
Vulnerability scan of fiona shows CVE-2020-14152. The vulnerability is in libjpeg, a transitive dependency of fiona (via GDAL and PROJ).
Details
In IJG JPEG (aka libjpeg) before 9d, jpeg_mem_available() in jmemnobs.c in djpeg does not honor the max_memory_to_use setting, possibly causing excessive memory consumption.
Impact
fiona will not open JPEG files and is not vulnerable to attack in that way. fiona might be vulnerable to malformed PROJ grid files using JPEG compression. No such vulnerability or compromise has been demonstrated.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | fiona | all versions | 1.10b2pip install --upgrade 'fiona==1.10b2' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for fiona, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update fiona to 1.10b2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-g4m4-9q4c-mfw6 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-g4m4-9q4c-mfw6 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-g4m4-9q4c-mfw6. 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-g4m4-9q4c-mfw6 in your dependencies?
O3 Security finds GHSA-g4m4-9q4c-mfw6 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.