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CVE-2026-110600— xlsxio through 0.2.37 NULL Pointer Dereference via Worksheet Relationship Without Id

Quick assessment

Affected
brechtsanders xlsxio
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.

xlsxio 版本 0.2.37 及之前版本存在空指针解引用漏洞，该漏洞位于 lib/xlsxio_read.c 文件中的 main_sheet_get_sheetfile_expat_callback_element_start() 函数内。攻击者可利用精心构造的文件导致应用程序崩溃。具体而言，攻击者可以提供一个 .xlsx 文件，其 workbook.xml.rels 中不包含 Id 属性的工作表关系（Worksheet Relationship），从而在调用 xlsxioread_sheet_open() 时

CVSS 5.5 · Medium EPSS 0.24% · P14

Affected Version Matrix 1

VendorProduct Version RangeStatus
brechtsanders xlsxio ≤ 0.2.37 affected
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I. Basic Information for CVE-2026-110600

Vulnerability Information
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Vulnerability Title
xlsxio through 0.2.37 NULL Pointer Dereference via Worksheet Relationship Without Id
Source: CVE Program / CVE List V5
Vulnerability Description
xlsxio through 0.2.37 contains a NULL pointer dereference vulnerability in main_sheet_get_sheetfile_expat_callback_element_start() in lib/xlsxio_read.c that allows attackers to crash applications via crafted files. Attackers can supply a .xlsx file whose workbook.xml.rels contains a worksheet Relationship lacking an Id attribute, crashing the process when xlsxioread_sheet_open() is called.
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
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
brechtsanders xlsxio 0 ~ 0.2.37 -

II. Public POCs for CVE-2026-110600

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III. Intelligence Information for CVE-2026-110600

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Other References for CVE-2026-110600 (3)

IV. Related Vulnerabilities

Same weakness: CWE-476

V. Comments for CVE-2026-110600

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