Affected: AlmaLinux:8: python3-pillow, AlmaLinux:8: python3-pillow-devel, AlmaLinux:8: python3-pillow-doc, AlmaLinux:8: python3-pillow-tk
Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.
Security Fix(es):
* Pillow: Pillow: Native heap out-of-bounds write (CVE-2026-59197) * Pillow: Pillow: Memory disclosure or denial of service via crafted McIdas AREA image (CVE-2026-54058)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected: Bitnami: pillow
Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0.
Affected: Homebrew: aider
### Summary
Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size.
Minimal public API trigger:
```python from PIL import Image, ImageFilter
im = Image.new("L", (3, 3), 128) im.filter(ImageFilter.MedianFilter(4294967295)) ```
`ImageFilter.RankFilter.filter()` calls `image.expand(size // 2, size // 2)` before rank-filter size validation. With `size = 4294967295`, the expansion margin is `2147483647` (`INT_MAX`). `ImagingExpand()` then computes the output dimensions with unchecked signed `int` arithmetic. On tested builds, this wraps to a tiny output image and the border-expansion loop writes past the allocation.
This is reachable through documented public classes (`RankFilter`, `MedianFilter`, `MinFilter`, and `MaxFilter`). No private API, ctypes, or custom Python object is needed.
### Details
Current `src/PIL/ImageFilter.py`:
```python class RankFilter(Filter): def filter(self, image): if image.mode == "P": msg = "cannot filter palette images" raise ValueError(msg) image = image.expand(self.size // 2, self.size // 2) return image.rankfilter(self.size, self.rank) ```
The `expand()` call is made before `image.rankfilter(...)`.
Current `src/libImaging/Filter.c:ImagingExpand()` does not check output-size overflow:
```c if (xmargin < 0 && ymargin < 0) { return (Imaging)ImagingError_ValueError("bad kernel size"); }
imOut = ImagingNewDirty( imIn->m…
Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0.
Affected: PyPI: Pillow
### Summary
Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size.
Minimal public API trigger:
```python from PIL import Image, ImageFilter
im = Image.new("L", (3, 3), 128) im.filter(ImageFilter.MedianFilter(4294967295)) ```
`ImageFilter.RankFilter.filter()` calls `image.expand(size // 2, size // 2)` before rank-filter size validation. With `size = 4294967295`, the expansion margin is `2147483647` (`INT_MAX`). `ImagingExpand()` then computes the output dimensions with unchecked signed `int` arithmetic. On tested builds, this wraps to a tiny output image and the border-expansion loop writes past the allocation.
This is reachable through documented public classes (`RankFilter`, `MedianFilter`, `MinFilter`, and `MaxFilter`). No private API, ctypes, or custom Python object is needed.
### Details
Current `src/PIL/ImageFilter.py`:
```python class RankFilter(Filter): def filter(self, image): if image.mode == "P": msg = "cannot filter palette images" raise ValueError(msg) image = image.expand(self.size // 2, self.size // 2) return image.rankfilter(self.size, self.rank) ```
The `expand()` call is made before `image.rankfilter(...)`.
Current `src/libImaging/Filter.c:ImagingExpand()` does not check output-size overflow:
```c if (xmargin < 0 && ymargin < 0) { return (Imaging)ImagingError_ValueError("bad kernel size"); }
imOut = ImagingNewDirty( imIn->m…
Affected: openEuler:20.03-LTS-SP4: python-pillow
Pillow is the friendly PIL fork by Alex Clark and Contributors. PIL is the Python Imaging \ Library by Fredrik Lundh and Contributors. As of 2019, Pillow development is supported by Tidelift. of CVE-2022-22815,CVE-2022-22816) Security Fix(es):
Pillow is a Python imaging library. Prior to 12.3.0, PIL/PcfFontFile.py _load_bitmaps() read glyph dimensions from the PCF METRICS section and passed them directly to Image.frombytes() without calling Image._decompression_bomb_check(), allowing crafted PCF font data to cause excessive memory allocation. This issue is fixed in version 12.3.0.(CVE-2026-54059)
Pillow is a Python imaging library. Prior to 12.3.0, PIL/FontFile.py FontFile.compile() assembled per-glyph images into a combined bitmap with Image.new("1", (xsize, ysize)) without calling Image._decompression_bomb_check(), allowing a font to trigger excessive allocation during conversion or saving. This issue is fixed in version 12.3.0.(CVE-2026-54060)
Pillow is a Python imaging library. Prior to 12.3.0, PIL/BdfFontFile.py bdf_char() read the BBX width and height field from a BDF font file and passed attacker-controlled dimensions to Image.new() without calling Image._decompression_bomb_check(), bypassing Pillow's documented decompression bomb protection and allowing excessive memory allocation. This issue is fixed in version 12.3.0.(CVE-2026-55379)
Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimen…
Security update for python-Pillow
Affected: PyPI: pillow
Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0.
brace-expansion: Brace-expansion: Denial of Service due to exponential-time complexity decode-uri-component: decode-uri-component: Denial of Service via crafted input Pillow: Pillow: Memory disclosure or denial of service via crafted McIdas AREA image python-pillow: Pillow: Denial of Service via excessive memory allocation when processing font files python-pillow: Pillow: Denial of Service via crafted BDF font file python-pillow: Pillow: Denial of Service via crafted GD 2.x image file Pillow: Pillow: Native heap out-of-bounds write Pillow: Pillow: Denial of Service via out-of-bounds write in image processing Pillow: Pillow: Denial of service via crafted PDF stream Pillow: Pillow: Denial of Service via crafted JPEG2000 image Pillow: Pillow: Controlled native heap corruption in ImageCms.ImageCmsTransform.apply API pyasn1: python-pyasn1: pyasn1: Denial of Service via crafted ASN.1 OBJECT IDENTIFIER pyasn1: pyasn1: Denial of Service via crafted ASN.1 REAL values
Affected: Rocky Linux:8: python-pillow
Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.
Security Fix(es):
* Pillow: Pillow: Native heap out-of-bounds write (CVE-2026-59197)
* Pillow: Pillow: Memory disclosure or denial of service via crafted McIdas AREA image (CVE-2026-54058)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Security update for python-Pillow
Affected: Ubuntu:Pro:14.04:LTS: pillow, Ubuntu:Pro:16.04:LTS: pillow, Ubuntu:Pro:18.04:LTS: pillow, Ubuntu:Pro:20.04:LTS: pillow, Ubuntu:Pro:20.04:LTS: pillow-python2, Ubuntu:22.04:LTS: pillow, Ubuntu:24.04:LTS: pillow, Ubuntu:26.04:LTS: pillow
Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0.
Ein Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux (Pillow) ausnutzen, um Informationen offenzulegen, um einen Denial of Service Angriff durchzuführen, und um Daten zu manipulieren.