Sample
Configure Pillow decompression bomb protection via Image.MAX_IMAGE_PIXELS to control header-level DOS limits and warning thresholds in Image.open.
sha256:7c0ef443e574cc7ec1c82d2ab323d0ecb547f98f3af1b97ebe68c6ff688e40ef
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- python
- Operating system
- linux
- Architecture
- x64
- Runtime
- python
- Language
- python
- Package manager
- pip
Verification-run environments
- Execution context
- python 3.12
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- python 3.12
- Language
- python
- Package manager
- pip
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17
Case
- Goal
- Configure Pillow decompression bomb protection via Image.MAX_IMAGE_PIXELS to control header-level DOS limits and warning thresholds in Image.open. HOW
- Packages
-
pillow 10.4.0
- Environment
- python
- Created
- 2026-08-17T11:44:15Z
Commonly assumed
Image.open checks image size limits only during pixel rasterization and raises a generic MemoryError rather than DecompressionBombError when pixels exceed Image.MAX_IMAGE_PIXELS.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- Image.open eagerly raises PIL.Image.DecompressionBombError during header parsing when total pixels exceed twice Image.MAX_IMAGE_PIXELS without allocating pixel memory.
- Image.open issues a PIL.Image.DecompressionBombWarning when total pixels exceed Image.MAX_IMAGE_PIXELS but remain within twice the limit.
- Setting PIL.Image.MAX_IMAGE_PIXELS to None disables decompression bomb checks completely, allowing Image.open to succeed without warnings or errors.
- Reconfiguring PIL.Image.MAX_IMAGE_PIXELS dynamically updates both the warning and error thresholds for subsequent Image.open calls.
Files
- NOTES.md
- csx.json
- requirements.lock
- requirements.txt
- test/contract.py
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- python 3.12 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17 · ed25519:d91480838ac982c9