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Medium severity · published Aug 10, 2026
CVE-2026-71392
Integer Overflow in GNU Emacs for Android
5.3
CVSS
0.7%
EPSS
No
On KEV
Description
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
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EM
Emacs · GNU
through 30.2 · source: vendor
Affected product
EM
Emacs
GNU
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-71392
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-71392
cert.pl
https://cert.pl/en/posts/2026/08/CVE-2026-71391
git.savannah.gnu.org
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=c4e20777c26548722a37b03db93243e83a0d6188
www.gnu.org
https://www.gnu.org/savannah-checkouts/gnu/emacs/emacs.html
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