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.

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.

Affected: openEuler:22.03-LTS-SP4: emacs, openEuler:24.03-LTS-SP1: emacs, openEuler:24.03-LTS-SP3: emacs, openEuler:24.03-LTS-SP4: emacs, openEuler:20.03-LTS-SP4: emacs

Emacs is the extensible, customizable, self-documenting real-time display editor. At its core is an interpreter for Emacs Lisp, a dialect of the Lisp programming language with extensions to support text editing. And it is an entire ecosystem of functionality beyond text editing, including a project planner, mail and news reader, debugger interface, calendar, and more. Security Fix(es):

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.(CVE-2026-77219)

Security update for emacs

Security update for emacs

Affected: Ubuntu:Pro:16.04:LTS: emacs24, Ubuntu:16.04:LTS: xemacs21, Ubuntu:16.04:LTS: xemacs21-packages, Ubuntu:Pro:18.04:LTS: emacs25, Ubuntu:18.04:LTS: xemacs21, Ubuntu:18.04:LTS: xemacs21-packages, Ubuntu:Pro:20.04:LTS: emacs, Ubuntu:20.04:LTS: xemacs21, Ubuntu:20.04:LTS: xemacs21-packages, Ubuntu:22.04:LTS: xemacs21 and 8 more

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.

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in GNU Emacs ausnutzen, um Informationen offenzulegen oder Denial-of-Service-Zustände herbeizuführen.