Is CVE-2026-112394 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-112394 being exploited in the wild.

How severe is CVE-2026-112394?

Medium severity, with a CVSS score of 4, published 19 October 2026.

Which products and versions are affected?

pillow (PyPI) <= 12.3.0, ECOSYSTEM:introduced=0,fixed=13.0.0; Python Pillow Pillow before 13.0.0.

Is there a fix for CVE-2026-112394?

Yes. pillow (PyPI): upgrade to 13.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-112394 attacked?

It is attacked over the network or with local access, in a software library.

Am I affected by CVE-2026-112394?

Check whether you run pillow (PyPI) or Python Pillow Pillow at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-112394: Pillow buffer over-read in P;2L and P;4L raw decoders

Q: Which products and versions are affected?

pillow (PyPI) <= 12.3.0, ECOSYSTEM:introduced=0,fixed=13.0.0; Python Pillow Pillow before 13.0.0.

Q: Is there a fix for CVE-2026-112394?

Yes. pillow (PyPI): upgrade to 13.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-112394 attacked?

It is attacked over the network or with local access, in a software library.

Q: Am I affected by CVE-2026-112394?

Check whether you run pillow (PyPI) or Python Pillow Pillow at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-112394 · Severity: medium · CVSS 4 · Published 2026-10-19

Pillow is a Python library for image processing and manipulation. The P;2L and P;4L raw image decoders can read past the end of an input buffer, potentially disclosing up to three bytes of adjacent heap memory or crashing the application. An attacker can craft a malicious image with mismatched buffer size and dimensions to trigger the vulnerability.

Technologies: pillow (PyPI), Python Pillow Pillow. Vendors: PyPI, Python Pillow.

Quick answers

Is CVE-2026-112394 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-112394 being exploited in the wild.
How severe is CVE-2026-112394?: Medium severity, with a CVSS score of 4, published 19 October 2026.
Which products and versions are affected?: pillow (PyPI) <= 12.3.0, ECOSYSTEM:introduced=0,fixed=13.0.0; Python Pillow Pillow before 13.0.0.
Is there a fix for CVE-2026-112394?: Yes. pillow (PyPI): upgrade to 13.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-112394 attacked?: It is attacked over the network or with local access, in a software library.
Am I affected by CVE-2026-112394?: Check whether you run pillow (PyPI) or Python Pillow Pillow at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

pillow (PyPI): upgrade to 13.0.0 or later
```
pip install "pillow>=13.0.0"
```

Technical details

The ImagingRawDecode function calculates packed-pixel row size incorrectly for P;2L and P;4L raw modes, while unpackers read separately padded bit planes. An attacker can supply a buffer and image dimensions whose declared size is smaller than the unpacker's actual memory footprint, causing out-of-bounds reads. The vulnerability allows information disclosure of heap data or denial of service via crash.

Affected products

Python Pillow Pillow before 13.0.0

Identifiers

CVE-2026-112394
BIT-PILLOW-2026-112394
GHSA-4558-3h8r-v8xp
PYSEC-2026-4327

Timeline

2026-10-19: disclosed
2026-10-16: patched

References

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