CVE-2026-71393Network attack vector

Heap corruption via wrapped font allocation

Published Aug 10, 2026 · Updated Aug 10, 2026

Integer overflow in GNU Emacs for Android 30.2 and earlier allows remote attackers to corrupt heap memory via a crafted TrueType font. sfnt_read_name_table() uses an unchecked 32-bit font length to size an allocation, allowing wraparound before read() writes into the undersized buffer. Exploitation requires a 32-bit Android build and user-driven font loading through email, EWW, or a document with custom faces.

CVSS severity5.3
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in GNU Emacs for Android 30.2 and earlier allows remote attackers to corrupt heap memory via a crafted TrueType font. sfnt_read_name_table() uses an unchecked 32-bit font length to size an allocation, allowing wraparound before read() writes into the undersized buffer. Exploitation requires a 32-bit Android build and user-driven font loading through email, EWW, or a document with custom faces.

The record

CVE
CVE-2026-71393
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The GnuPG Project
Product
GNU Emacs
Classifications
CWE-190, 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 d51a4722316efe0960994d371e1859099894d1ca","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 d51a4722316efe0960994d371e1859099894d1ca","status":"unaffected"}]

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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-190Integer Overflow or Wraparound
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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