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CVE-2026-54059— Pillow: PcfFontFile._load_bitmaps()`: `Image.frombytes()` called without `_decompression_bomb_check()` — bomb protection bypass via PCF font loading

CVSS 7.5 · High EPSS 0.35% · P27

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
python-pillowPillow< 12.3.0affected
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I. Basic Information for CVE-2026-54059

Vulnerability Information
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Vulnerability Title
Pillow: PcfFontFile._load_bitmaps()`: `Image.frombytes()` called without `_decompression_bomb_check()` — bomb protection bypass via PCF font loading
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未经控制的内存分配
Source: NVD (National Vulnerability Database)
Vulnerability Title
Pillow 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pillow是Pillow组织开源的一款基于Python的图像处理库。 Pillow 12.3.0之前版本存在资源管理错误漏洞，该漏洞源于在 PCF 文件中读取字符尺寸时未调用 decompression bomb check，可能导致特制 PCF 字体数据造成内存过度分配。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
python-pillowPillow < 12.3.0 -

II. Public POCs for CVE-2026-54059

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 12190 chars
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III. Intelligence Information for CVE-2026-54059

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Patches & Fixes for CVE-2026-54059 (1)

Vendor Advisories for CVE-2026-54059 (1)

Vendor Pages for CVE-2026-54059 (1)

Same Patch Batch · python-pillow · 2026-07-06 · 5 CVEs total

CVE-2026-540607.5 HIGHPillow: `FontFile.compile()`: `Image.new()` called without `_decompression_bomb_check()`
CVE-2026-553807.5 HIGHPillow GdImageFile decompression bomb protection bypass
CVE-2026-553797.5 HIGHPillow BdfFontFile`: `Image.new()` called without `_decompression_bomb_check()` — bomb pro
CVE-2026-557984.5 MEDIUMPillow: WindowsViewer.get_command() OS command injection via unescaped shell path

IV. Related Vulnerabilities

Same product: Pillow
Same vendor: python-pillow
Same weakness: CWE-789

V. Comments for CVE-2026-54059

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