Bug 2553702 (CVE-2026-111126)

Summary: CVE-2026-111126 catdoc: catdoc: Denial of Service via malformed Excel file
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in catdoc. An out-of-bounds read vulnerability exists in the spreadsheet parsing logic of the xls2csv utility. By convincing a user to process a specially crafted Excel file, an attacker could trigger memory reads beyond the allocated buffer boundaries. This issue primarily leads to an application crash, resulting in a Denial of Service (DoS), and may also allow the disclosure of adjacent memory data.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2554036    
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Description OSIDB Bzimport 2026-10-15 19:08:46 UTC 
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.