CVE-2026-112892: Pillow: MSP RLE decoder expands a tiny file into unbounded memory

October 21, 2026

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.

References

github.com/advisories/GHSA-gg2r-wvfm-q9rx
github.com/python-pillow/Pillow/commit/5dcb630b9798efd91929cb873d677aeee6ed0bb3
github.com/python-pillow/Pillow/releases/tag/13.0.0
github.com/python-pillow/Pillow/security/advisories/GHSA-gg2r-wvfm-q9rx
nvd.nist.gov/vuln/detail/CVE-2026-112892

Code Behaviors & Features

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