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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-2026-55379 — Pillow BdfFontFile`: `Image.new()` called without `_decompression_bomb_check()` — bomb protection bypass via font loadi…

Affected: Bitnami: pillow

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.

BREW-aider-CVE-2026-55379 — Pillow `BdfFontFile`: `Image.new()` called without `_decompression_bomb_check()` — bomb protection bypass via font load…

Affected: Homebrew: aider

### Summary `PIL/BdfFontFile.py` `bdf_char()` (lines 84–88) reads the `BBX width height` field from a BDF font file and passes the dimensions directly to `Image.new()` without calling `Image._decompression_bomb_check()`. This completely bypasses Pillow's documented decompression bomb protection.

`Image.open()` enforces `MAX_IMAGE_PIXELS = 89,478,485` and raises `DecompressionBombError` for images exceeding `2 × MAX = 178,956,970` pixels. The BDF font loading path calls `Image.new()` directly, which only calls `_check_size()` (validates `>= 0`) — no pixel count limit.

**Vulnerable code (`PIL/BdfFontFile.py` lines 84–88):** ```python # width, height from attacker-controlled "BBX width height x y" line try: im = Image.frombytes("1", (width, height), bitmap, "hex", "1") except ValueError: # TRIGGERED when BITMAP section is empty (zero hex lines) im = Image.new("1", (width, height)) # ← NO _decompression_bomb_check()! # ^ This image is stored in self.glyph[ch] — persists in memory ```

**Attack trigger:** A BDF glyph with `BBX 20000 20000` and an empty `BITMAP` section causes `Image.frombytes()` to raise `ValueError`, then `Image.new("1", (20000, 20000))` allocates **50 MB** of C-heap silently. Image.open() would raise `DecompressionBombError` for the same dimensions.

## Steps to reproduce

**Minimal malicious BDF file (270 bytes):** ``` STARTFONT 2.1 SIZE 16 75 75 FONTBOUNDINGBOX 16 16 0 -4 STARTPROPERTIES 1 COMMENT placeholder ENDPROPERTIES CHARS 1 STARTCHA…

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-2026-333505

fkie_cve-2026-55379

GHSA-45hq-cxwh-f6vc — Pillow `BdfFontFile`: `Image.new()` called without `_decompression_bomb_check()` — bomb protection bypass via font load…

Affected: PyPI: pillow

## Steps to reproduce

**Minimal malicious BDF file (270 bytes):** ``` STARTFONT 2.1 SIZE 16 75 75 FONTBOUNDINGBOX 16 16 0 -4 STARTPROPERTIES 1 COMMENT placeholder ENDPROPERTIES CHARS 1 STARTCHA…

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/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/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-2026-2255

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-2026-55379

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.