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CVE-2026-111677— Antiword through 0.37 Heap Out-of-Bounds Read via vGet8LstInfo in prop8.c

Quick assessment

Affected
Adri van Os antiword
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.

Antiword 0.37 及更早版本在 prop8.c 的 vGet8LstInfo 函数中存在堆越界读取漏洞。该漏洞源于对 PlcfLst 记录数量的边界检查逻辑颠倒。攻击者可构造一个 Word 8 格式的 .doc 文件，声称在极小的缓冲区中包含多达 0xffff 个 LSTF 记录，从而导致读取超出堆分配范围，最终引发进程崩溃。

CVSS 5.5 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Adri van Os antiword ≤ 0.37 affected
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I. Basic Information for CVE-2026-111677

Vulnerability Information
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Vulnerability Title
Antiword through 0.37 Heap Out-of-Bounds Read via vGet8LstInfo in prop8.c
Source: CVE Program / CVE List V5
Vulnerability Description
Antiword through 0.37 contains a heap out-of-bounds read vulnerability in vGet8LstInfo in prop8.c caused by an inverted bounds check on the PlcfLst record count. Attackers can supply a crafted Word 8 .doc file claiming up to 0xffff LSTF records in a tiny buffer, causing reads past the heap allocation that crash the process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Adri van Os antiword 0 ~ 0.37 -

II. Public POCs for CVE-2026-111677

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-111677

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Vendor Advisories for CVE-2026-111677 (1)

Proof of Concept for CVE-2026-111677 (1)

Security Blog Posts for CVE-2026-111677 (1)

IV. Related Vulnerabilities

Same product: antiword
Same vendor: Adri van Os
Same weakness: CWE-125

V. Comments for CVE-2026-111677

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