CVE-2026-71393— Heap Buffer Overflow in GNU Emacs for Android
Possible ATT&CK Techniques 1AI
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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
II. Public POCs for CVE-2026-71393
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Patches & Fixes for CVE-2026-71393 (1)
Security Blog Posts for CVE-2026-71393 (1)
- 🔗 Vulnerabilities in GNU Emacs software | CERT Polskathird-party-advisory
Other References for CVE-2026-71393 (1)
- 🔗 GNU Emacs - GNU Projectproduct
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 |
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V. Comments for CVE-2026-71393
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