CVE-2026-71392: GNU Emacs for Android is vulnerable to an integer overflow in the sfnt_read_cmap_format_12() function in src/s

Routine

MEDIUM 5.3

CVE-2026-71392 is a medium-severity flaw (CVSS 5.3) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 memor

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Passive
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-190
Published	2026-08-10
Last modified	2026-10-23

Publisher (CNA): CERT.PL

Timeline

2026-08-10 11:17 UTCPublished CVE record published
2026-10-23 20:10 UTCUpdated Record last modified

Exact fixes by distribution

Fedora 46 · clementine · FIXED · 1.4.2-1.fc46 · FEDORA-2026-3e748ef4d3 · source

sudo dnf upgrade --advisory=FEDORA-2026-3e748ef4d3

Debian 12 · emacs · NOT AFFECTED

Debian 13 · emacs · NOT AFFECTED

RHEL 10 · emacs · NOT AFFECTED

RHEL 6 · emacs · NOT AFFECTED

RHEL 7 · emacs · NOT AFFECTED

RHEL 8 · emacs · NOT AFFECTED

RHEL 9 · emacs · NOT AFFECTED

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

References

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