GNU Emacs before 31.0.91 contains an integer overflow in the PBM/PPM/PGM image loader that allows an attacker to leak heap memory contents by supplying a crafted image with large dimensions and an elevated max color index. The image loader multiplies image dimensions and channel count using signed integer arithmetic; for sufficiently large values, the result wraps to a negative number, bypassing the bounds check and causing the pixel reader to access heap memory past the end of the allocated buffer. The over-read contents are interpreted as pixel color values and rendered on screen.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade emacsUpgrade emacs-noxUpgrade emacs-lucidUpgrade emacs-commonUpgrade emacs-filesystem | Oct 12, 2026 | Oct 12, 2026 |
| Amazon_linux_2023 | — | Upgrade emacs-debugsourceUpgrade emacs-lucid-debuginfoUpgrade emacs-develUpgrade emacs-nox-debuginfoUpgrade emacs-lucidUpgrade emacs-commonUpgrade emacs-terminalUpgrade emacsUpgrade emacs-noxUpgrade emacs-common-debuginfoUpgrade emacs-filesystemUpgrade emacs-debuginfo | Sep 30, 2026 | Aug 21, 2026 |
| Redhat_linux | — | No solution existsUpgrade emacsUpgrade emacs-filesystemUpgrade emacs-debuginfoUpgrade emacs-lucidUpgrade emacs-noxUpgrade emacs-nox-debuginfoUpgrade emacs-common-debuginfoUpgrade emacs-commonUpgrade emacs-lucid-debuginfoUpgrade emacs-debugsource | Aug 26, 2026 | Aug 21, 2026 |
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