Threats Tagged 'cve-2026-77219'

This update for emacs fixes the following issues: Security issues fixed: - Arbitrary code execution when opening a specially crafted file (bsc#1275941). - CVE-2026-77219: integer overflow in the PBM/PPM/PGM image loader leads to heap memory content leaks when a crafted image with large dimensions and an elevated max color index is processed (bsc#1276264). - CVE-2026-79992: improper argument sanitization in TRAMP leads to arbitrary code execution via crafted filenames (bsc#1275927). Other updates and bugfixes: - Fix memory leak in wayland port (bsc#1271643).

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.