CVE-2026-71392
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
GNU Emacs for Android is vulnerable to an integer overflow in the sfnt_read_cmap_format_12() function in src/sfnt.c. When processing a crafted TrueType font file, an unguarded addition in the xmalloc allocation call wraps around on 32-bit builds, causing a heap buffer overflow write. This can lead to heap memory corruption and potential code execution.
Risk Assessment
An attacker can deliver a malicious font file, potentially leading to heap memory corruption and potential code execution in the context of Emacs.
Recommendation
Update GNU Emacs to a version containing commit c4e20777c26548722a37b03db93243e83a0d6188 or later. Avoid opening untrusted font files.
Original NVD description (English source)
GNU Emacs for Android is vulnerable to an integer overflow in the sfnt_read_cmap_format_12() function in src/sfnt.c. When processing a crafted TrueType font file, an unguarded addition in the xmalloc allocation call wraps around on 32-bit builds, causing a heap buffer overflow write. An attacker can deliver a malicious font file via email, EWW (Emacs Web Wowser), or documents with custom faces, causing Emacs to load it. This results in heap memory corruption that can lead to code execution. This issue was fixed in commit c4e20777c26548722a37b03db93243e83a0d6188