Is CVE-2026-112397 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-112397 being exploited in the wild.

How severe is CVE-2026-112397?

High 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-2026-112397?

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-2026-112397 attacked?

It is attacked over the network or with local access.

Am I affected by CVE-2026-112397?

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-2026-112397: Pillow buffer underflow in ImageMorph.MorphOp.apply

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-2026-112397?

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-2026-112397 attacked?

It is attacked over the network or with local access.

Q: Am I affected by CVE-2026-112397?

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-2026-112397 · Severity: high · CVSS 4 · Published 2026-10-19

Pillow is a Python image processing library used in many web and document processing applications. A malicious or crafted PPM/PGM image file with zero width can trigger an out-of-bounds memory read when a morphology operation is applied, causing the application to crash and potentially denying service.

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

Quick answers

Is CVE-2026-112397 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-112397 being exploited in the wild.
How severe is CVE-2026-112397?: High 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-2026-112397?: 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-2026-112397 attacked?: It is attacked over the network or with local access.
Am I affected by CVE-2026-112397?: 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 vulnerability is a buffer underflow in ImageMorph.MorphOp.apply() that occurs when processing zero-width images created by PPM or PGM input formats. The native morphology routine attempts to access outrow[width - 1] without bounds checking, leading to out-of-bounds memory access. An attacker can supply a crafted image to trigger a crash in any application that applies morphology operations.

Affected products

python-pillow Pillow before 13.0.0

Identifiers

CVE-2026-112397
BIT-PILLOW-2026-112397
GHSA-58r4-6rv3-gfh8
PYSEC-2026-4329

Timeline

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

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.