CVE-2026-77219
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
39/100
Published: 2026-08-21
Modified: 2026-11-08
First seen: 2026-11-08
Status: active
Attack Surface
Low Complexity
No Auth
Conf. Impact
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
None
UI:
Passive
AT:
None
VC:
High
VI:
None
VA:
High
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.
Weakness Classification (2)
References & Advisories (4)
third-party-advisory
release-notes
patch
issue-tracking