High [CVE-2026-71392] integer overflow via a malicious font file
This high-severity Red Hat Linux advisory covers CVE-2026-71392.
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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.
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 An integer overflow can occur when a specially crafted font file is processed on 32-bit systems due to an unguarded addition during memory allocation.
This can cause an undersized heap allocation and subsequently a heap-based buffer overflow, resulting in memory corruption and a denial of service. To exploit this flaw, a user needs to load a malicious font file or a document with custom faces, limiting its exposure.
Additionally, this flaw is specific to GNU Emacs for Android on 32-bit target systems. For these reasons, this vulnerability has been rated with a moderate severity.
Red Hat severity: Moderate — CVSS 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H). Weakness: CWE-190.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 30 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 30 days ago·verify at source
Mitigation checklist
- Do not load untrusted font files or open unverified documents with custom faces.
Official advisory · high-confidence parse· fetched 30 days ago·verify at source
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