---
id: CVE-2026-88816
title: >-
  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
summary: >-
  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 FetchHash…
severity: none
cwe:
  - CWE-843
product: DBI
affected:
  - DBI < 1.654
published: '2026-09-28'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T17:17:52.203'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88816'
references:
  - url: >-
      https://github.com/perl5-dbi/dbi/commit/70962570212dc60a5428098cf2a0462ad5945851.patch
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: 'https://github.com/perl5-dbi/dbi/security/advisories/GHSA-f4qx-mr9m-q2hq'
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: 'https://metacpan.org/release/HMBRAND/DBI-1.654/changes'
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-28T17:16:27.816Z'
---

## Overview

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;

## Remediation

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