Bug 2554509 (CVE-2026-110752)

Summary: CVE-2026-110752 perl-Text-CSV_XS: perl-Text-CSV_XS: Denial of Service via excessive memory allocation in fragment selector
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in perl-Text-CSV_XS. When parsing fragment selectors, the component pre-allocates array entries for every index in a requested range before reading data and without validating the range bounds against the input. An attacker could exploit this vulnerability by providing a crafted selector with an excessively large range, leading to uncontrolled memory consumption and causing a Denial of Service (DoS).
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Bug Depends On: 2555370, 2555371    
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Description OSIDB Bzimport 2026-10-16 22:22:28 UTC 
Text::CSV_XS versions before 1.65 for Perl allow memory exhaustion by allocating one entry per index of an RFC 7111 selector in fragment.

fragment expands a row= or col= selector into an array with one element per selected index before it reads any data, and it does not clamp an explicit end column in a cell= selector to the row. Only the syntax and order of the ranges are checked, so row=1-400000000 on a two-line file allocates 400 million elements.

An application that passes a request-supplied fragment to fragment or csv can be made to exhaust memory, which ends the process with an Out of memory error that eval cannot catch.