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CVE-2026-59204— Pillow JPEG2000 tiled decode retains a growing scratch buffer and can be used for 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存在资源管理错误漏洞，该漏洞源于在src/libImaging/Jpeg2KDecode.c中对total_component_width的处理不当，其在JPEG2000图像的每个平铺中累加而非重新计算，导致解码时出现大量瞬态内存使用并触发内存不足。以下版本受到影响：8.2.0版本、8.3.0版本、8.3.1版本、8.3.2版本、8.4.0版本、9.0.0版本、9.0.1版本、9.1

AI Predicted 5.3 Difficulty: Easy EPSS 0.39% · P30

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
python-pillow Pillow >= 8.2.0, < 12.3.0 affected
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I. Basic Information for CVE-2026-59204

Vulnerability Information
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Vulnerability Title
Pillow JPEG2000 tiled decode retains a growing scratch buffer and can be used for denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
Pillow is a Python imaging library. From 8.2.0 through 12.2.0, src/libImaging/Jpeg2KDecode.c accumulates total_component_width across every tile in a JPEG2000 image instead of recomputing it per tile, allowing a crafted tiled JPEG2000 file to force substantially higher transient memory usage and trigger out-of-memory failures during decoding. This issue is fixed in version 12.3.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
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存在资源管理错误漏洞，该漏洞源于在src/libImaging/Jpeg2KDecode.c中对total_component_width的处理不当，其在JPEG2000图像的每个平铺中累加而非重新计算，导致解码时出现大量瞬态内存使用并触发内存不足。以下版本受到影响：8.2.0版本、8.3.0版本、8.3.1版本、8.3.2版本、8.4.0版本、9.0.0版本、9.0.1版本、9.1
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 >= 8.2.0, < 12.3.0 -

II. Public POCs for CVE-2026-59204

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III. Intelligence Information for CVE-2026-59204

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Patches & Fixes for CVE-2026-59204 (2)

Vendor Advisories for CVE-2026-59204 (1)

Vendor Pages for CVE-2026-59204 (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-2026-59203 5.3 MEDIUM Pillow EpsImagePlugin negative %%BeginBinary byte count causes infinite loop denial of ser
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-789

V. Comments for CVE-2026-59204

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