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CVE-2026-59203— Pillow EpsImagePlugin negative %%BeginBinary byte count causes infinite loop denial of service

Quick assessment

Affected
python-pillow Pillow
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

python-pillow Pillow是python-pillow的图像处理库。 python-pillow Pillow 12.0.0版本至12.2.0版本存在资源管理错误漏洞，该漏洞源于EPS解析器在PIL/EpsImagePlugin.py中接受%%BeginBinary指令中的负字节计数，可能导致特制的EPS文件使Image.open()向后查找同一指令并重复解析形成无限循环。

CVSS 5.3 · Medium EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 1

VendorProduct Version RangeStatus
python-pillow Pillow >= 12.0.0, < 12.3.0 affected
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I. Basic Information for CVE-2026-59203

Vulnerability Information
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Vulnerability Title
Pillow EpsImagePlugin negative %%BeginBinary byte count causes infinite loop denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
Pillow is a Python imaging library. From 12.0.0 through 12.2.0, Pillow's EPS parser in PIL/EpsImagePlugin.py accepts a negative byte count in the %%BeginBinary directive, allowing a crafted EPS file to cause Image.open() to seek backwards to the same directive and parse it repeatedly in an infinite loop. This issue is fixed in version 12.3.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
python-pillow Pillow 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
python-pillow Pillow是python-pillow的图像处理库。 python-pillow Pillow 12.0.0版本至12.2.0版本存在资源管理错误漏洞，该漏洞源于EPS解析器在PIL/EpsImagePlugin.py中接受%%BeginBinary指令中的负字节计数，可能导致特制的EPS文件使Image.open()向后查找同一指令并重复解析形成无限循环。
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

Vendor Product Affected Versions CPE Subscribe
python-pillow Pillow >= 12.0.0, < 12.3.0 -

II. Public POCs for CVE-2026-59203

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III. Intelligence Information for CVE-2026-59203

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Patches & Fixes for CVE-2026-59203 (2)

Vendor Advisories for CVE-2026-59203 (1)

Vendor Pages for CVE-2026-59203 (1)

Same Patch Batch · python-pillow · 2026-07-14 · 8 CVEs total

CVE-2026-59197 8.2 HIGH Pillow: Heap out-of-bounds write in Pillow `ImageFilter.RankFilter` via integer overflow i
CVE-2026-59199 7.5 HIGH Pillow: Heap out-of-bounds write `Image.paste()` / `Image.crop()` via signed coordinate ov
CVE-2026-59205 7.5 HIGH Pillow: Controlled heap out-of-bounds write in `ImageCmsTransform.apply()` via output mode
CVE-2026-59200 7.5 HIGH Pillow: Decompression Bomb DoS via PdfParser.PdfStream.decode()
CVE-2026-59198 6.5 MEDIUM Pillow TGA RLE encoder can serialize up to ~57 KB of adjacent heap data into generated ima
CVE-2026-59204 Pillow JPEG2000 tiled decode retains a growing scratch buffer and can be used for denial o
CVE-2026-54058 Pillow: Out-of-bounds read via attacker-controlled row stride on Pillow's mmap path (McIda

IV. Related Vulnerabilities

Same product: Pillow
Same vendor: python-pillow
Same weakness: CWE-835

V. Comments for CVE-2026-59203

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