{"id":"CVE-2026-77219","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-77219","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…","details":"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.","published":"2026-08-21T21:17:06.590","modified":"2026-08-21T21:17:06.590","cvss":{"score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/emacs-mirror/emacs/commit/b07e634e4cf45162ae0178e32092b040587f2c6c","label":"emacs-mirror/emacs@b07e634"},"references":[{"type":"WEB","url":"https://debbugs.gnu.org/cgi/bugreport.cgi?bug=81344"},{"type":"WEB","url":"https://github.com/emacs-mirror/emacs/commit/b07e634e4cf45162ae0178e32092b040587f2c6c"},{"type":"WEB","url":"https://github.com/emacs-mirror/emacs/releases/tag/emacs-31.0.91"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/gnu-emacs-heap-over-read-via-pbm-ppm-pgm-image-loader"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-21T21:17:06.590"}}