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CVE-2026-71392— Integer Overflow in GNU Emacs for Android

Quick assessment

Affected
GNU Emacs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GNU emacs是美国GNU基金会开源的一款可扩展的文本编辑环境。 GNU Emacs 30.2及之前版本存在数字错误漏洞，该漏洞源于处理特制TrueType字体文件时sfnt_read_cmap_format_12()函数中的整数溢出，导致堆缓冲区溢出，攻击者可通过电子邮件、EWW或带有自定义字体的文档传递恶意字体文件，造成堆内存破坏，可能导致代码执行。

CVSS 5.3 · Medium EPSS 0.67% · P50

Affected Version Matrix 1

VendorProduct Version RangeStatus
GNU Emacs ≤ 30.2 affected
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I. Basic Information for CVE-2026-71392

Vulnerability Information
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Vulnerability Title
Integer Overflow in GNU Emacs for Android
Source: CVE Program / CVE List V5
Vulnerability Description
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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
GNU Emacs 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNU emacs是美国GNU基金会开源的一款可扩展的文本编辑环境。 GNU Emacs 30.2及之前版本存在数字错误漏洞，该漏洞源于处理特制TrueType字体文件时sfnt_read_cmap_format_12()函数中的整数溢出，导致堆缓冲区溢出，攻击者可通过电子邮件、EWW或带有自定义字体的文档传递恶意字体文件，造成堆内存破坏，可能导致代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GNU Emacs 0 ~ 30.2 -

II. Public POCs for CVE-2026-71392

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III. Intelligence Information for CVE-2026-71392

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Patches & Fixes for CVE-2026-71392 (1)

Security Blog Posts for CVE-2026-71392 (1)

Other References for CVE-2026-71392 (1)

Same Patch Batch · GNU · 2026-08-10 · 7 CVEs total

CVE-2026-71393 5.3 MEDIUM Heap Buffer Overflow in GNU Emacs for Android
CVE-2026-71391 5.3 MEDIUM Off-by-One Error in GNU Emacs for Android
CVE-2026-71394 5.3 MEDIUM Heap Use of Uninitialized Memory in GNU Emacs for Android
CVE-2026-66484 4.6 MEDIUM Path Traversal in GNU cpio
CVE-2026-66486 4.6 MEDIUM Improper Output Encoding in GNU cpio
CVE-2026-66485 4.6 MEDIUM Uncontrolled Memory Allocation in GNU cpio

IV. Related Vulnerabilities

Same product: Emacs
Same vendor: GNU
Same weakness: CWE-190

V. Comments for CVE-2026-71392

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