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.

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact Low

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 Low

Integrity Impact None

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

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
catdoc catdoc unaffected
Version Status Constraints
0 affected ≤ 0.95

No data.

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Project Subscriptions

Vendors Products
Fossies Subscribe
Catdoc 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/vbwagner/catdoc cve-icon cve-icon
https://github.com/vbwagner/catdoc/blob/38a2807d22ce1a08bc39b94e9072a9f8f52cd86f/src/xlsparse.c#L421-L520 cve-icon cve-icon
https://hackmd.io/@haind-pwn/catdoc-xls-mulrk-endcol-and-string-count-oob-read cve-icon cve-icon
https://www.vulncheck.com/advisories/catdoc-through-0.95-out-of-bounds-read-via-xls2csv-copy-unicode-string cve-icon cve-icon
History

Thu, 15 Oct 2026 19:00:00 +0000

Type Values Removed Values Added
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.
Title catdoc through 0.95 Out-of-Bounds Read via xls2csv copy_unicode_string
First Time appeared Fossies
Fossies catdoc
Weaknesses CWE-125
CPEs cpe:2.3:a:fossies:catdoc:*:*:*:*:*:*:*:*
Vendors & Products Fossies
Fossies catdoc
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-15T18:57:23.479Z

Reserved: 2026-10-15T17:03:51.865Z

Link: CVE-2026-111127

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-15T19:17:26.073

Modified: 2026-10-15T19:17:26.073

Link: CVE-2026-111127

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses