Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://debbugs.gnu.org/cgi/bugreport.cgi?bug=81344
- https://github.com/emacs-mirror/emacs/commit/b07e634e4cf45162ae0178e32092b040587
- https://github.com/emacs-mirror/emacs/releases/tag/emacs-31.0.91
- https://www.vulncheck.com/advisories/gnu-emacs-heap-over-read-via-pbm-ppm-pgm-im
FAQ
What is CVE-2026-77219?
CVE-2026-77219 is a vulnerability with a CVSS score of 7.1 (HIGH). 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 ele...
How severe is CVE-2026-77219?
CVE-2026-77219 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-77219?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.