CVE catalog
CVE-2026-71392
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
- Severity
- High · CVSS 7.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.67% · Oct 25, 2026
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
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | emacs | sid | 1:30.2+1-11 | not affected |
| Debian | emacs | forky | 1:30.2+1-11 | not affected |
| Debian | emacs | trixie | 1:30.1+1-6+deb13u1 | not affected |
| Debian | emacs | trixie-security | 1:30.1+1-6+deb13u1 | not affected |
| Debian | emacs | bookworm | 1:28.2+1-15+deb12u4 | not affected |
| Debian | emacs | bookworm-security | 1:28.2+1-15+deb12u4 | not affected |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | emacs | source | sid | Not affected | unimportant | Not reported | Not reported |
| Debian | emacs | source | forky | Not affected | unimportant | Not reported | Not reported |
| Debian | emacs | source | trixie | Not affected | unimportant | Not reported | Not reported |
| Debian | emacs | source | bookworm | Not affected | unimportant | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [emacs]Not affected
Details (6)
1:28.2+1-15+deb12u4· all · bookwormNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· all · bookwormNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· all · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· all · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· all · bookworm-securityNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· all · bookworm-securityNot affected
nvd · emacs · debian · bookworm
- [emacs-bin-common]Not affected
Source package: [emacs]
Details (6)
1:28.2+1-15+deb12u4· amd64 · bookwormNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· arm64 · bookwormNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· amd64 · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· arm64 · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· amd64 · bookworm-securityNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· arm64 · bookworm-securityNot affected
nvd · emacs · debian · bookworm
- [emacs-common]Not affected
Source package: [emacs]
Details (6)
1:28.2+1-15+deb12u4· all · bookwormNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· all · bookwormNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· all · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· all · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· all · bookworm-securityNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· all · bookworm-securityNot affected
nvd · emacs · debian · bookworm
- [emacs-el]Not affected
Source package: [emacs]
Details (6)
1:28.2+1-15+deb12u4· all · bookwormNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· all · bookwormNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· all · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· all · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· all · bookworm-securityNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· all · bookworm-securityNot affected
nvd · emacs · debian · bookworm
- [emacs-gtk]Not affected
Source package: [emacs]
Details (6)
1:28.2+1-15+deb12u4· amd64 · bookwormNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· arm64 · bookwormNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· amd64 · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· arm64 · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· amd64 · bookworm-securityNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· arm64 · bookworm-securityNot affected
nvd · emacs · debian · bookworm
- [emacs-lucid]Not affected
Source package: [emacs]
Details (6)
1:28.2+1-15+deb12u4· amd64 · bookwormNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· arm64 · bookwormNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· amd64 · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· arm64 · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· amd64 · bookworm-securityNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· arm64 · bookworm-securityNot affected
nvd · emacs · debian · bookworm
- [emacs-nox]Not affected
Source package: [emacs]
Details (6)
1:28.2+1-15+deb12u4· amd64 · bookwormNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· arm64 · bookwormNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· amd64 · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· arm64 · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· amd64 · bookworm-securityNot affected
nvd · emacs · debian · bookworm
1:28.2+1-15+deb12u4· arm64 · bookworm-securityNot affected
nvd · emacs · debian · bookworm
- [emacs-pgtk]Not affected
Source package: [emacs]
Details (2)
1:30.1+1-6~bpo12+1· amd64 · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
1:30.1+1-6~bpo12+1· arm64 · bookworm-backportsNot affected
nvd · emacs · debian · bookworm
Observed:
References
- [https://cert.pl/en/posts/2026/08/CVE-2026-71391]
- [https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=c4e20777c26548722a37b03db93243e83a0d6188]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-71392]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-71392]
- [https://security-tracker.debian.org/tracker/CVE-2026-71392]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-71392.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2721.json]
- [https://www.gnu.org/savannah-checkouts/gnu/emacs/emacs.html]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]