CVE catalog
CVE-2026-71391
GNU Emacs for Android contains an off-by-one error in the gvar table parser in src/sfnt.c. The shared-coordinate index boundary check in sfnt_vary_simple_glyph() and sfnt_vary_compound_glyph() uses a
- Severity
- Medium · CVSS 5.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.54% · Oct 25, 2026
GNU Emacs for Android contains an off-by-one error in the gvar table parser in src/sfnt.c. The shared-coordinate index boundary check in sfnt_vary_simple_glyph() and sfnt_vary_compound_glyph() uses a strict greater-than comparison instead of greater-than-or-equal, allowing a crafted TrueType variable font to bypass the check and trigger a heap-based out-of-bounds read via memcpy. 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 exposes heap memory contents which can be later used to defeat ASLR. This issue was fixed in commit 95ab9ef627b212d74d321c5bbb5b56a1be7b9fbe
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=95ab9ef627b212d74d321c5bbb5b56a1be7b9fbe]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-71391]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-71391]
- [https://security-tracker.debian.org/tracker/CVE-2026-71391]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-71391.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]