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CVE-2026-111127— catdoc through 0.95 Out-of-Bounds Read via xls2csv copy_unicode_string

Quick assessment

Affected
catdoc catdoc
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.

catdoc 0.95 及更早版本在 src/xlsparse.c 的 copy_unicode_string() 函数中存在一个越界读取漏洞，攻击者可通过未经验证的字符串字符计数，读取缓冲区以外的数据。攻击者可构造一个包含在 LABEL、STRING 或 SST 记录中声明 0xFFFF 个双字节字符的恶意 .xls 文件，从而通过 xls2csv 的输出披露相邻内存内容，或导致程序崩溃。

CVSS 6.1 · Medium EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
catdoc catdoc ≤ 0.95 affected
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I. Basic Information for CVE-2026-111127

Vulnerability Information
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Vulnerability Title
catdoc through 0.95 Out-of-Bounds Read via xls2csv copy_unicode_string
Source: CVE Program / CVE List V5
Vulnerability Description
catdoc through 0.95 contains an out-of-bounds read vulnerability in copy_unicode_string() in src/xlsparse.c that allows attackers to read past buffers via an unchecked string character count. Attackers can supply a crafted .xls file declaring 0xFFFF two-byte characters in LABEL, STRING, or SST records to disclose adjacent memory through xls2csv output or 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:L/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
catdoc catdoc 0 ~ 0.95 -

II. Public POCs for CVE-2026-111127

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III. Intelligence Information for CVE-2026-111127

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Patches & Fixes for CVE-2026-111127 (1)

Vendor Advisories for CVE-2026-111127 (1)

Security Blog Posts for CVE-2026-111127 (1)

Other References for CVE-2026-111127 (1)

IV. Related Vulnerabilities

Same product: catdoc
Same vendor: catdoc
Same weakness: CWE-125

V. Comments for CVE-2026-111127

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