CVE-2026-71392: Integer Overflow in GNU Emacs for Android

Published Aug 10, 2026
·
Updated

GNU Emacs for Android is vulnerable to an integer overflow in the sfntreadcmapformat12() 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

Affected Software

1 affected component
GNU GNU Emacs for Android

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade GNU Emacs for Android to a version that resolves this vulnerability.

    Patch commit c4e20777c26548722a37b03db93243e83a0d6188

Event History

Aug 10, 2026
CVE Published
via MITRE·10:22 AM
Data Sourced
via MITRE·10:22 AM
DescriptionWeakness
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CVE-2026-71392 - Integer Overflow in GNU Emacs for Android - SecAlerts