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ALSA-2026:39127 — Important: python-pillow security update

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):

* python-pillow: Pillow: Denial of Service via crafted BDF font file (CVE-2026-55379) * python-pillow: Pillow: Denial of Service via crafted GD 2.x image file (CVE-2026-55380) * python-pillow: Pillow: Denial of Service via crafted PCF font data (CVE-2026-54059) * python-pillow: Pillow: Denial of Service via excessive memory allocation when processing font files (CVE-2026-54060)

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.

BIT-pillow-2026-54059 — Pillow: PcfFontFile._load_bitmaps()`: `Image.frombytes()` called without `_decompression_bomb_check()` — bomb protectio…

Affected: Bitnami: pillow

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.

BREW-aider-CVE-2026-54059 — Pillow `PcfFontFile._load_bitmaps()`: `Image.frombytes()` called without `_decompression_bomb_check()` — bomb protectio…

Affected: Homebrew: aider

## Description `PIL/PcfFontFile.py` `_load_bitmaps()` (line 227) reads glyph dimensions from the PCF `METRICS` section and passes them directly to `Image.frombytes()` without calling `Image._decompression_bomb_check()`. Dimensions originate from unsigned 16-bit values:

``` xsize = right - left (max: 65535 − 0 = 65535) ysize = ascent + descent (max: 65535 + 65535 = 131070) ```

Maximum exploitable pixel count: **65,535 × 131,070 = 8,589,734,450 pixels** — **48× the DecompressionBombError threshold**.

**Vulnerable code (`PIL/PcfFontFile.py` line 224–227):** ```python for i in range(nbitmaps): xsize, ysize = metrics[i][:2] # from PCF METRICS — attacker-controlled b, e = offsets[i : i + 2] bitmaps.append( Image.frombytes("1", (xsize, ysize), data[b:e], "raw", mode, pad(xsize)) # ↑ NO _decompression_bomb_check()! ) ```

`Image.frombytes()` calls `Image.new()` first (allocating the full C-heap buffer), **then** attempts to fill it. This creates two distinct attack paths:

- **Persistent attack**: Provide matching bitmap data → `frombytes()` succeeds → image stored in `font.glyph[ch]` permanently - **Transient attack**: Provide a 148-byte PCF file with large declared dimensions but no data → `Image.new()` allocates the full buffer → `ValueError` → buffer freed → but the spike occurs before Python can respond

## Steps to reproduce

**Proof of Concept script:**

```python #!/usr/bin/env python3 """PoC: PcfFontFile bomb bypass — 148-…

certfr-2026-avi-1094 — De multiples vulnérabilités ont été découvertes dans les produits IBM. Certaines d'entre elles permettent à un attaquan…

certfr-2026-avi-1094

EUVD-2026-333733

fkie_cve-2026-54059

GHSA-8v84-f9pq-wr9x — Pillow `PcfFontFile._load_bitmaps()`: `Image.frombytes()` called without `_decompression_bomb_check()` — bomb protectio…

Affected: PyPI: pillow

``` xsize = right - left (max: 65535 − 0 = 65535) ysize = ascent + descent (max: 65535 + 65535 = 131070) ```

Maximum exploitable pixel count: **65,535 × 131,070 = 8,589,734,450 pixels** — **48× the DecompressionBombError threshold**.

`Image.frombytes()` calls `Image.new()` first (allocating the full C-heap buffer), **then** attempts to fill it. This creates two distinct attack paths:

## Steps to reproduce

**Proof of Concept script:**

```python #!/usr/bin/env python3 """PoC: PcfFontFile bomb bypass — 148-…

OESA-2026-3137 — python-pillow security update

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/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…

openSUSE-SU-2026:11261-1 — python313-Pillow-12.3.0-1.1 on GA media

python313-Pillow-12.3.0-1.1 on GA media

PYSEC-2026-2253

Affected: PyPI: pillow

RHSA-2026:48759 — Red Hat Security Advisory: python-pillow security update

python-pillow: Pillow: Denial of Service via crafted PCF font data 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

RLSA-2026:39127 — Important: python-pillow security update

Affected: Rocky Linux:8: python-pillow

Security Fix(es):

* python-pillow: Pillow: Denial of Service via crafted BDF font file (CVE-2026-55379)

* python-pillow: Pillow: Denial of Service via crafted GD 2.x image file (CVE-2026-55380)

* python-pillow: Pillow: Denial of Service via crafted PCF font data (CVE-2026-54059)

* python-pillow: Pillow: Denial of Service via excessive memory allocation when processing font files (CVE-2026-54060)

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.

SUSE-SU-2026:22626-1 — Security update for python-Pillow

Security update for python-Pillow

UBUNTU-CVE-2026-54059

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

WID-SEC-W-2026-2301 — Red Hat Enterprise Linux (python-pillow): Mehrere Schwachstellen ermöglichen Denial of Service

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux bzgl. python-pillow ausnutzen, um einen Denial of Service Angriff durchzuführen.