CVE-2026-71394Network attack vector

Memory disclosure and crashes via malformed font directory

Published Aug 10, 2026 · Updated Aug 10, 2026

Improper input validation in GNU Emacs for Android 30.2 and earlier allows attackers to disclose memory or crash Emacs via a crafted font. In src/sfnt.c, sfnt_read_table_directory() compares the read length against the wrong variable, accepting more declared table entries than the file contains and leaving directory entries backed by uninitialized heap data. Exploitation requires Emacs to load the font through email, EWW, or a document with custom faces; subsequent table lookups can expose data, crash the app, or access arbitrary memory on 32-bit targets.

CVSS severity5.3
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in GNU Emacs for Android 30.2 and earlier allows attackers to disclose memory or crash Emacs via a crafted font. In src/sfnt.c, sfnt_read_table_directory() compares the read length against the wrong variable, accepting more declared table entries than the file contains and leaving directory entries backed by uninitialized heap data. Exploitation requires Emacs to load the font through email, EWW, or a document with custom faces; subsequent table lookups can expose data, crash the app, or access arbitrary memory on 32-bit targets.

The record

CVE
CVE-2026-71394
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The GnuPG Project
Product
GNU Emacs
Classifications
CWE-1284, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=30.2 changes=[{"at":"commit 7621ee1d01229d50e5c0cddea6bf0b01095a62cf","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The GnuPG Project · GNU Emacsversion=0 <=30.2 changes=[{"at":"commit 7621ee1d01229d50e5c0cddea6bf0b01095a62cf","status":"unaffected"}]

Published CVSS scores

5.3UbuntuCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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