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GNU Emacs CVE-2026-71391

| EUVDEUVD-2026-55260 MEDIUM
Off-by-one Error (CWE-193)
2026-08-10 CERT-PL GHSA-49vj-r7f8-c3p6
Google Buffer Overflow Emacs
5.3
CVSS 4.0 · Vendor: CERT-PL
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Severity by source

Vendor (CERT-PL) PRIMARY
5.3 MEDIUM
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
vuln.today AI
4.3 MEDIUM

Font delivered over network requires user to open content (UI:R); OOB heap read leaks Emacs process memory (C:L); no write primitive, no integrity or availability impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
3.3 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Red Hat
3.3 LOW
qualitative

Primary rating from Vendor (CERT-PL).

CVSS VectorVendor: CERT-PL

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 10, 2026 - 11:04 vuln.today
CVE Published
Aug 10, 2026 - 10:22 cve.org
MEDIUM 5.3

DescriptionCVE.org

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

AnalysisAI

GNU Emacs for Android leaks heap memory contents through a crafted TrueType variable font, enabling ASLR bypass as a stepping stone to further exploitation. The flaw resides in the gvar table parser (src/sfnt.c), where an off-by-one error in shared-coordinate index boundary checks allows a font file to trigger an out-of-bounds heap read via memcpy. …

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Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The victim must use GNU Emacs for Android and must actively open or render content containing a malicious TrueType variable font. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 5.3 (Medium) reflects a network-reachable but user-interaction-dependent attack with no direct impact on the vulnerable system and only low subsequent-system confidentiality impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation The upstream fix is available as git commit 95ab9ef627b212d74d321c5bbb5b56a1be7b9fbe in the GNU Emacs Savannah repository (https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=95ab9ef627b212d74d321c5bbb5b56a1be7b9fbe); this is a source-level patch and a formally released patched version has not been independently confirmed from the available data. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 12 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Not-Affected

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CVE-2026-71391 vulnerability details – vuln.today
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