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CVE-2026-71393— Heap Buffer 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src/sfnt.c中的sfnt_read_name_table()函数在计算内存分配大小时未对TrueType字体文件中的32位长度值进行溢出检查，导致整数溢出和堆缓冲区溢出，攻击者可通过特制字体文件导致堆内存损坏和潜在代码执行。

CVSS 5.3 · Medium EPSS 0.67% · P50

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
GNU Emacs ≤ 30.2 affected
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I. Basic Information for CVE-2026-71393

Vulnerability Information
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Vulnerability Title
Heap Buffer 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 sfnt_read_name_table() in src/sfnt.c. The function computes an allocation size using a 32-bit length value from a TrueType font file without overflow checking. On 32-bit targets, a crafted font causes the calculation to wrap, resulting in an undersized heap allocation. A subsequent read() call writes beyond the buffer, causing a heap buffer overflow. 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 can lead to heap memory corruption and potential code execution. This issue was fixed in commit d51a4722316efe0960994d371e1859099894d1ca
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src/sfnt.c中的sfnt_read_name_table()函数在计算内存分配大小时未对TrueType字体文件中的32位长度值进行溢出检查，导致整数溢出和堆缓冲区溢出，攻击者可通过特制字体文件导致堆内存损坏和潜在代码执行。
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-2026-71393

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III. Intelligence Information for CVE-2026-71393

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Patches & Fixes for CVE-2026-71393 (1)

Security Blog Posts for CVE-2026-71393 (1)

Other References for CVE-2026-71393 (1)

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

CVE-2026-71392 5.3 MEDIUM Integer 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-2026-71393

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