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.

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00237.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
brechtsanders xlsxio unaffected
Version Status Constraints
0 affected ≤ 0.2.37

No data.

No data.

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Project Subscriptions

Vendors Products
Xlsxio Project Subscribe
Xlsxio Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/brechtsanders/xlsxio/blob/0.2.37/lib/xlsxio_read.c#L851-L866 cve-icon cve-icon
https://github.com/brechtsanders/xlsxio/issues/151 cve-icon cve-icon
https://hackmd.io/@haind-pwn/xlsxio-relationship-missing-id-null-deref cve-icon cve-icon
https://www.vulncheck.com/advisories/xlsxio-through-0.2.37-null-pointer-dereference-via-worksheet-relationship-without-id cve-icon cve-icon
History

Wed, 14 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
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.
Title xlsxio through 0.2.37 NULL Pointer Dereference via Worksheet Relationship Without Id
First Time appeared Xlsxio Project
Xlsxio Project xlsxio
Weaknesses CWE-476
CPEs cpe:2.3:a:xlsxio_project:xlsxio:*:*:*:*:*:*:*:*
Vendors & Products Xlsxio Project
Xlsxio Project xlsxio
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 6.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-14T20:43:54.196Z

Reserved: 2026-10-14T13:07:20.207Z

Link: CVE-2026-110600

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-10-14T15:17:11.387

Modified: 2026-10-15T14:47:05.720

Link: CVE-2026-110600

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-15T03:00:13Z

Weaknesses