CVE WatchAug 21, 2026

CVE-2026-77219

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 b

CVSS

7.1

High

EPSS

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KEV

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Exploit Today

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0-100

Published: Aug 21, 2026 · Last modified: Aug 21, 2026 · CWE-125 · CWE-190

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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