---
id: CVE-2026-111126
title: >-
  catdoc through 0.95 contains an out-of-bounds read vulnerability in the MULRK
  record handler of process_item() in src/xlsparse.c that allows attackers to
  read past the static rec buffer via a crafted end column
summary: >-
  catdoc through 0.95 contains an out-of-bounds read vulnerability in the MULRK
  record handler of process_item() in src/xlsparse.c that allows attackers to
  read past the static rec buffer via a crafted end column. Attackers can supply
  a cr…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'
cwe:
  - CWE-125
vendor: catdoc
product: catdoc
affected:
  - catdoc <= 0.95
published: '2026-10-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:25:45.343'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-111126'
references:
  - url: 'https://github.com/vbwagner/catdoc'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/vbwagner/catdoc/blob/38a2807d22ce1a08bc39b94e9072a9f8f52cd86f/src/xlsparse.c#L314-L328
    label: disclosure@vulncheck.com
  - url: >-
      https://hackmd.io/@haind-pwn/catdoc-xls-mulrk-endcol-and-string-count-oob-read
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/catdoc-through-0.95-out-of-bounds-read-in-xls2csv-mulrk-record-handler
    label: disclosure@vulncheck.com
  - url: >-
      https://hackmd.io/@haind-pwn/catdoc-xls-mulrk-endcol-and-string-count-oob-read
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00197
epssPercentile: 0.09402
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-15T19:53:46.325067Z'
ingestedAt: '2026-10-15T19:25:46.407Z'
---

## Overview

catdoc through 0.95 contains an out-of-bounds read vulnerability in the MULRK record handler of process_item() in src/xlsparse.c that allows attackers to read past the static rec buffer via a crafted end column. Attackers can supply a crafted .xls workbook or BIFF stream with a large endcol to xls2csv to disclose adjacent process memory as CSV cells or crash the process.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.