GHSA-gg2r-wvfm-q9rx
Pillow: MSP RLE decoder expands a tiny file into unbounded memory
At a glance
- Published
- Updated
- CVE
- CVE-2026-112892
- Aliases
- BIT-pillow-2026-112892
- CVSS_V4
- 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
Description
### Summary The MSP RLE decoder expands run-length data into an in-memory buffer with no cap tied to the declared image size. A small file that passes the pixel-count check can force hundreds of megabytes or more of allocation when the application loads pixels. ### Details The MSP decoder writes each run into an unbounded `io.BytesIO` and can expand roughly 85x per run: - `src/PIL/MspImagePlugin.py:144-146` ### Impact Memory-exhaustion denial of service from a tiny crafted image in any application that loads pixels. The expansion is decoupled from the declared pixel count, so `MAX_IMAGE_PIXELS` does not bound it.
Affected packages
| Package | Versions |
|---|---|
| PyPI · pillow | introduced 4.1.0, fixed 13.0.0 |
References
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-gg2r-wvfm-q9rx WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-112892 ADVISORY
- https://github.com/python-pillow/Pillow/commit/5dcb630b9798efd91929cb873d677aeee6ed0bb3 WEB
- https://github.com/python-pillow/Pillow PACKAGE
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |