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HIGH severity

Pillow denial of service via Crafted Block SizeGHSA-cfmr-38g9-f2h7

HIGHFix: python-pillow/Pillow@205e056

GHSA-cfmr-38g9-f2h7 is a high-severity (CVSS 7.5) Improper Input Validation vulnerability in pillow. A fix is available for pillow — see the affected versions and patch details below.

Also known asCVE-2014-3589PYSEC-2014-10
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
3.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs89th percentile — riskier than 89% of all scored CVEsHighest risk
0.73%1.90%3.07%4.25%1.4%3.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐍pillow🐍pillow

Real-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

PIL/IcnsImagePlugin.py in Python Imaging Library (PIL) and Pillow before 2.3.2 and 2.5.x before 2.5.2 allows remote attackers to cause a denial of service via a crafted block size.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIpillowall versions2.3.2pip install --upgrade 'pillow==2.3.2'
🐍PyPIpillow≥ 2.5&&< 2.5.22.5.2pip install --upgrade 'pillow==2.5.2'

Affected Products

3 products · 7 configurations
Application
python-imagingdebian
all
OS
opensuseopensuse
1 version
13.2
Application
pillowpython
≤ 2.3.1
4 versions
2.3.02.5.02.5.12.5.2

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pillow, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update pillow to 2.3.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-cfmr-38g9-f2h7 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

`PIL/IcnsImagePlugin.py` in Python Imaging Library (PIL) and Pillow before 2.3.2 and 2.5.x before 2.5.2 allows remote attackers to cause a denial of service via a crafted block size.
O3 Security · Impact-Aware SCA

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Pillow denial of service via Crafted Block Size (High 7.5)