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CVE-2026-96643— Pillow: PNG eXIf chunk makes EXIF parsing run in quadratic time

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.

Pillow 是一个 Python 图像处理库。在 11.0.0 至 13.0.0 版本中， 中的 函数在处理以六字节 Exif 头开始的剩余 EXIF 数据时，会反复进行切片操作。而 接受无大小限制的 PNG eXIf 块，因此若文件中包含重复的头部，每次迭代都会生成一个不断缩小的副本，导致 CPU 工作量呈二次方增长。该问题可通过 、 和 等接口触发，常见于照片上传时的旋转处理流程。此问题已在 13.0.0 版本中修复。

CVSS 7.1 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-96643

Vulnerability Information
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Vulnerability Title
Pillow: PNG eXIf chunk makes EXIF parsing run in quadratic time
Source: CVE Program / CVE List V5
Vulnerability Description
Pillow is a Python imaging library. From 11.0.0 until 13.0.0, Exif.load() in src/PIL/Image.py repeatedly slices the remaining EXIF data while it begins with the six-byte Exif header. src/PIL/PngImagePlugin.py accepts an uncapped PNG eXIf chunk, so a file filled with repeated headers causes a new shrinking copy on every iteration and quadratic CPU work. The condition is reachable through Image.getexif(), Image._getexif(), and ImageOps.exif_transpose(), including common photo-upload rotation workflows. This issue is fixed in version 13.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
python-pillow Pillow >= 11.0.0, < 13.0.0 -

II. Public POCs for CVE-2026-96643

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III. Intelligence Information for CVE-2026-96643

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Patches & Fixes for CVE-2026-96643 (1)

Vendor Advisories for CVE-2026-96643 (1)

Vendor Pages for CVE-2026-96643 (1)

Same Patch Batch · python-pillow · 2026-10-21 · 11 CVEs total

CVE-2026-96639 9.8 CRITICAL Pillow multi-frame loaders can reuse stale native image storage after mode transitions
CVE-2026-96640 8.2 HIGH Pillow PDF append accepts malformed shared page-tree DAG causing resource exhaustion
CVE-2026-96778 7.7 HIGH Pillow: Heap buffer overflow writing JPEG comment after ICC profile fills buffer
CVE-2026-96642 7.1 HIGH Pillow: TarIO negative size field causes infinite CPU-spin loop
CVE-2026-96644 7.1 HIGH Pillow: Heap over-read in WMF/EMF rendering via 16-bit dimension truncation (Windows build
CVE-2026-96637 7.1 HIGH Pillow: Decompression bomb check bypass in SpiderImagePlugin.seek() leads to unbounded all
CVE-2026-96638 6.5 MEDIUM Pillow: BMP RLE decoder memory-amplification DoS via unbounded delta escape / absolute mod
CVE-2026-96641 6.5 MEDIUM Pillow: Reachable undefined behavior in native integer operations, potentially leading to
CVE-2026-96636 6.5 MEDIUM Pillow: Decompression-bomb protection bypass via multi-frame seek() in MPO and DCX (MpoIma
CVE-2026-114501 6.3 MEDIUM Pillow: Arrow export leaks stale heap memory when PILLOW_ALIGNMENT > 1

IV. Related Vulnerabilities

Same product: Pillow
Same vendor: python-pillow
Same weakness: CWE-407

V. Comments for CVE-2026-96643

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