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CVE-2026-59197— Pillow: Heap out-of-bounds write in Pillow `ImageFilter.RankFilter` via integer overflow in `ImagingExpand`

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 12.3.0之前版本存在安全漏洞，该漏洞源于公共rank-filter API在给定非常大奇数滤镜大小时会触发原生堆越界写入，因为ImageFilter.RankFilter.filter()在rank-filter大小验证前调用image.expand(size // 2, size // 2)，且ImagingExpand()使用未检查的有符号整数运算计算输出维度。

CVSS 8.2 · High EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
python-pillow Pillow < 12.3.0 affected
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I. Basic Information for CVE-2026-59197

Vulnerability Information
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Vulnerability Title
Pillow: Heap out-of-bounds write in Pillow `ImageFilter.RankFilter` via integer overflow in `ImagingExpand`
Source: CVE Program / CVE List V5
Vulnerability Description
Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. 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:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
python-pillow Pillow 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
python-pillow Pillow是python-pillow的图像处理库。 python-pillow Pillow 12.3.0之前版本存在安全漏洞，该漏洞源于公共rank-filter API在给定非常大奇数滤镜大小时会触发原生堆越界写入，因为ImageFilter.RankFilter.filter()在rank-filter大小验证前调用image.expand(size // 2, size // 2)，且ImagingExpand()使用未检查的有符号整数运算计算输出维度。
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 < 12.3.0 -

II. Public POCs for CVE-2026-59197

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6163 chars
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III. Intelligence Information for CVE-2026-59197

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Patches & Fixes for CVE-2026-59197 (2)

Vendor Advisories for CVE-2026-59197 (1)

Vendor Pages for CVE-2026-59197 (1)

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

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-2026-59203 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-787

V. Comments for CVE-2026-59197

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