How severe is GHSA-4fx9-vc88-q2xc?

No CVSS score has been assigned to GHSA-4fx9-vc88-q2xc yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-4fx9-vc88-q2xc?

GHSA-4fx9-vc88-q2xc affects the following packages: pillow (PyPI). Ecosystems affected: PyPI.

How do I fix GHSA-4fx9-vc88-q2xc?

Update pillow to 9.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4fx9-vc88-q2xc is resolved across your whole dependency graph.

How do I detect GHSA-4fx9-vc88-q2xc in my PyPI dependencies?

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.

How do I mitigate GHSA-4fx9-vc88-q2xc if there is no patch (or I can't update yet)?

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.

Is GHSA-4fx9-vc88-q2xc actively exploited in the wild?

No public exploit code has been indexed for GHSA-4fx9-vc88-q2xc yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-4fx9-vc88-q2xc published, and has it been updated?

GHSA-4fx9-vc88-q2xc was published on March 11, 2022 and was last updated on December 5, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍 PyPI

Not in CISA KEV

Infinite loop in PillowGHSA-4fx9-vc88-q2xc

Fix: python-pillow/Pillow@baae9ec

GHSA-4fx9-vc88-q2xc is a security vulnerability in pillow. A fix is available for pillow — see the affected versions and patch details below.

Published

Mar 11, 2022

Updated

Dec 5, 2024

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Dec 5, 2024 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🐍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

JpegImagePlugin may append an EOF marker to the end of a truncated file, so that the last segment of the data will still be processed by the decoder.

If the EOF marker is not detected as such however, this could lead to an infinite loop where JpegImagePlugin keeps trying to end the file.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`pillow`	all versions	9.0.0`pip install --upgrade 'pillow==9.0.0'`

Detection & mitigation playbook

Open-source dependency

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.
Fix
Update pillow to 9.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4fx9-vc88-q2xc is resolved across your whole dependency graph.
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

JpegImagePlugin may append an EOF marker to the end of a truncated file, so that the last segment of the data will still be processed by the decoder. If the EOF marker is not detected as such however, this could lead to an infinite loop where JpegImagePlugin keeps trying to end the file.

O3 Security · Impact-Aware SCA

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