{"id":"CVE-2026-77219","title":"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","summary":"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 load…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H","cwe":["CWE-125","CWE-190"],"published":"2026-08-21","updated":"2026-09-24","sourceUpdated":"2026-09-24T20:43:32.537","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77219","references":[{"url":"https://debbugs.gnu.org/cgi/bugreport.cgi?bug=81344","label":"disclosure@vulncheck.com"},{"url":"https://github.com/emacs-mirror/emacs/commit/b07e634e4cf45162ae0178e32092b040587f2c6c","label":"disclosure@vulncheck.com"},{"url":"https://github.com/emacs-mirror/emacs/releases/tag/emacs-31.0.91","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/gnu-emacs-heap-over-read-via-pbm-ppm-pgm-image-loader","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00185,"epssPercentile":0.07164,"ingestedAt":"2026-09-24T20:51:40.217Z","slug":"CVE-2026-77219","body":"## Overview\n\nGNU 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}