CVE-2026-77219 - GNU Emacs < 31.0.91 Heap Over-Read via PBM/PPM/PGM Image Loader

CVE-2026-77219 - GNU Emacs < 31.0.91 Heap Over-Read via PBM/PPM/PGM Image Loader

https://cvefeed.io/rssfeed/latest.atom / Sat, 08/22/2026 - 01:27
CVE ID :CVE-2026-77219
Published : Aug. 21, 2026, 9:17 p.m. | 45 minutes ago
Description :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.
Severity: 7.1 | HIGH
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