CVE-2026-112397 · GHSA-58r4-6rv3-gfh8
Pillow: Out-of-bounds access in _imagingmorph on a zero-width image
- Risk score
- 70/100
- CVSS
- 8.7 v4.0
- Exploit chance (30 days)
- 0.4%
- Published
- 19 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Pillow's ImageMorph.MorphOp.apply() can access memory before a row buffer for a zero-width image, allowing an attacker to crash the process.
- Affected
- {'products': ['Pillow'], 'packages': ['Pillow'], 'versions': ['<= 12.3.0']}
- Fix
- Upgrade to version 13.0.0 or later
- Exploitation
- No known exploitation
Story map
At a glance
Pillow: Amber, patch this week. Pillow has a heap buffer overflow and stale-heap disclosure in _tiffWriteProc when saving compressed TIFF data through libtiff to a target without a usable fileno(). This can crash the process and may allow code execution.
The flaws
- CVE-2026-112397: Out-of-bounds access in _imagingmorph on a zero-width image (CVSS 8.7 · EPSS 0%)
- CVE-2026-112393: Heap buffer overflow in _tiffWriteProc when saving TIFF to BytesIO (CVSS 9.2 · EPSS 1%)
- CVE-2026-96639: Pillow multi-frame loaders can reuse stale native image storage after mode transitions (CVSS 9.8 · EPSS 1%)
- CVE-2026-112900: Argument Injection in Ghostscript call, potentially leading into RCE (CVSS 9.2 · EPSS 0%)
The fix
Upgrade Pillow: 13.0.0 or later on your release line
Who is exposed: {'products': ['Pillow'], 'packages': ['Pillow'], 'versions': ['>= 2.0.0, < 13.0.0']}
Where it stands
- Public proof of concept
- 1 outlet covering it
How it unfolded
- 23 Oct, The Hacker News (press): Critical Flaw in Python’s Popular Pillow Image Library Allows Code Execution via a Crafted Image
Connects to
- Same weakness: Out-of-bounds write (CWE-787). 257 other warnings in 30 days
Why it is Amber
- CVSS 8.7 high
- Remotely exploitable without logging in
- On your watchlist: PyPI
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| Pillow | pip | <= 12.3.0 | 13.0.0 |
References
- https://github.com/advisories/GHSA-58r4-6rv3-gfh8
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-58r4-6rv3-gfh8
- https://nvd.nist.gov/vuln/detail/CVE-2026-112397
- https://github.com/python-pillow/Pillow/commit/18f7c0dfee93063c51db6ed0ca8c4da2999dcb64
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0
- https://github.com/advisories/GHSA-58r4-6rv3-gfh8
Original description
Pillow is a Python imaging library. Prior to 13.0.0, Pillow's ImageMorph.MorphOp.apply() can access memory before a row buffer for a zero-width image. PPM and PGM input can create an image with width zero, and the native morphology routine indexes outrow[width - 1] without rejecting that geometry. An attacker can supply such an image to an application that applies a morphology operation. This can crash the process. This issue is fixed in version 13.0.0.
Last activity 19 Oct 2026. Patch Forecast updates every hour.