# CVE-2026-88816: DBI versions before 1.654 for Perl incorrectly treat numeric values as strings in FetchHashKeyName

CVE-2026-88816 is fixed in 2 products on 1 platform, first by libdbi-perl 1.647-1ubuntu0.26.04.4, released September 28, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-88816
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0039
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 28, 2026
- Weakness: Access of Resource Using Incompatible Type ('Type Confusion')
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88816

## Description

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;

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libdbi-perl Debian 12.15 (bookworm) | 1.643-4+deb12u3 | [DEBIAN-CVE-2026-88816](https://patchblox.com/security/data/fix/linux/debian-cve-2026-88816.md) | Sep 29, 2026 |
| Linux | libdbi-perl Debian 14 | 1.654-1 | [DEBIAN-CVE-2026-88816](https://patchblox.com/security/data/fix/linux/debian-cve-2026-88816.md) | Sep 29, 2026 |
| Linux | libdbi-perl Ubuntu 18.04.6 LTS (bionic) | 1.640-1ubuntu0.3+esm4 | [libdbi-perl 1.640-1ubuntu0.3+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libdbi-perl-1.640-1ubuntu0.3-esm4.md) | Oct 12, 2026 |
| Linux | libdbi-perl Ubuntu 20.04 LTS (focal) | 1.643-1ubuntu0.1+esm4 | [libdbi-perl 1.643-1ubuntu0.1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libdbi-perl-1.643-1ubuntu0.1-esm4.md) | Oct 12, 2026 |
| Linux | libdbi-perl Ubuntu 22.04.1 LTS (jammy) | 1.643-3ubuntu0.4 | [libdbi-perl 1.643-3ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libdbi-perl-1.643-3ubuntu0.4.md) | Oct 12, 2026 |
| Linux | libdbi-perl Ubuntu 24.04.5 LTS (noble) | 1.643-4ubuntu0.4 | [libdbi-perl 1.643-4ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libdbi-perl-1.643-4ubuntu0.4.md) | Oct 12, 2026 |
| Linux | libdbi-perl Ubuntu 26.04.1 LTS (resolute) | 1.647-1ubuntu0.26.04.4 | [libdbi-perl 1.647-1ubuntu0.26.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libdbi-perl-1.647-1ubuntu0.26.04.4.md) | Sep 28, 2026 |
| Linux | perl-DBI sles 15.7 | 1.647.0-150600.12.26.1 | [SUSE-SU-2026:4805-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4805-1.md) | Nov 7, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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