Bug 2542560 (CVE-2026-88816)

Summary: CVE-2026-88816 perl-DBI: perl-DBI: Denial of Service via numeric FetchHashKeyName attribute
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in perl-DBI. An attacker or user capable of supplying a numeric value to the FetchHashKeyName attribute can cause a Denial of Service (DoS). The fetchrow_hashref function attempts to use the attribute value as a string pointer without stringifying it first, leading to an invalid memory read and triggering a segmentation fault that crashes the application.
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Bug Depends On: 2542966    
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Description OSIDB Bzimport 2026-09-28 16:31:44 UTC 
DBI versions before 1.654 for Perl incorrectly treat numeric values as strings in FetchHashKeyName.

fetchrow_hashref uses the string pointer of the FetchHashKeyName attribute as the key name without stringifying it first. When FetchHashKeyName has been set to an integer (IV) or floating-point (NV) value, that pointer is invalid, so reading the key name triggers a segmentation fault.

This can be triggered with the following code:

   my $dbh = DBI->connect( "dbi:ExampleP:", "", "",
       { RaiseError => 0, PrintError => 0 } );
   $dbh->{FetchHashKeyName} = 42;

   my $sth = $dbh->prepare("select mode, size, name from .");
   $sth->execute;
   $sth->fetchrow_hashref;