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CVE-2026-59200— Pillow: Decompression Bomb DoS via PdfParser.PdfStream.decode()

Quick assessment

Affected
python-pillow Pillow
Exploitation
Public or AI PoC available; prioritize validation
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 5.1.0版本至12.3.0之前版本存在资源管理错误漏洞，该漏洞源于PdfParser.PdfStream.decode()函数调用zlib.decompress()时未限制解压输出大小，允许特制的FlateDecode PDF流从较小的文件中耗尽内存。

CVSS 7.5 · High EPSS 0.39% · P30

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
python-pillow Pillow >= 5.1.0, < 12.3.0 affected
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I. Basic Information for CVE-2026-59200

Vulnerability Information
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Vulnerability Title
Pillow: Decompression Bomb DoS via PdfParser.PdfStream.decode()
Source: CVE Program / CVE List V5
Vulnerability Description
Pillow is a Python imaging library. From 5.1.0 until 12.3.0, PdfParser.PdfStream.decode() in PIL/PdfParser.py calls zlib.decompress() with bufsize set to the PDF stream Length field without bounding the decompressed output size, allowing a crafted FlateDecode PDF stream to exhaust memory from a small file. 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:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
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 5.1.0版本至12.3.0之前版本存在资源管理错误漏洞，该漏洞源于PdfParser.PdfStream.decode()函数调用zlib.decompress()时未限制解压输出大小，允许特制的FlateDecode PDF流从较小的文件中耗尽内存。
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 >= 5.1.0, < 12.3.0 -

II. Public POCs for CVE-2026-59200

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: MemoryError (exit code 1) from unbounded zlib.decompress in PdfParser.PdfStream.decode(); proof token PROOF_39a713bd6a6a8fe3 confirmed: PROOF_39a713bd6a6a8fe3
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 9176 chars
GitHub 复现环境（可 clone 直接跑）
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III. Intelligence Information for CVE-2026-59200

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Patches & Fixes for CVE-2026-59200 (2)

Vendor Advisories for CVE-2026-59200 (1)

Vendor Pages for CVE-2026-59200 (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-2026-59198 6.5 MEDIUM Pillow TGA RLE encoder can serialize up to ~57 KB of adjacent heap data into generated ima
CVE-2026-59203 5.3 MEDIUM Pillow EpsImagePlugin negative %%BeginBinary byte count causes infinite loop denial of ser
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-400

V. Comments for CVE-2026-59200

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