Fiona affected by CVE-2020-14152 related to madler-zlib

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N · score source

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

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, jpegmemavailable() in jmemnobs.c in djpeg does not honor the maxmemorytouse 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.

Published by the source

16 Jul 2024, 19:32 UTC

Last modified by the source

1 Dec 2024, 05:38 UTC

Source last checked

26 Oct 2026, 13:16 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-g4m4-9q4c-mfw6

2. Revision 2 · amended · 24 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-g4m4-9q4c-mfw6

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-g4m4-9q4c-mfw6

Advisory: Fiona affected by CVE-2020-14152 related to madler-zlib
IDs: GHSA-g4m4-9q4c-mfw6
Record: https://patchnext.com/advisories/ghsa-g4m4-9q4c-mfw6 (revision 3, source checked 26 Oct 2026, 13:16 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: fiona 1.10b2. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI fiona: affected < 1.10b2; fixed in 1.10b2

## Suggested inspection (read-only)
- `python -m pip show fiona`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on fiona.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-g4m4-9q4c-mfw6 (OSV record GHSA-g4m4-9q4c-mfw6 lists affected ranges: PyPI fiona >=0 <1.10b2 (fixed))
- Verified: https://github.com/advisories/GHSA-g4m4-9q4c-mfw6 (GitHub-reviewed advisory GHSA-g4m4-9q4c-mfw6 lists affected ranges: PyPI fiona >=0 <1.10b2)

Commands are suggestions: review each one before running it.