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Fencer Intel
high 7.5

CVE-2026-88816 json

DBI versions before 1.654 for Perl incorrectly treat numeric values as strings in FetchHashKeyName

published last mo. modified last mo. also EUVD-2026-88343 , GHSA-f4qx-mr9m-q2hq

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository perl5-dbi/dbi. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

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 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;

Patch / fix

  • perl dbi 1.654
  • libdbi-perl Debian 12 1.643-4+deb12u3
  • libdbi-perl Debian 14 1.654-1

debian advisories DEBIAN-CVE-2026-88816

  • libdbi-perl Ubuntu 22.04 LTS 1.643-3ubuntu0.4
  • libdbi-perl Ubuntu 24.04 LTS 1.643-4ubuntu0.4
  • libdbi-perl Ubuntu 26.04 LTS 1.647-1ubuntu0.26.04.4
  • libdbi-perl Ubuntu Pro 14.04 LTS 1.630-1ubuntu0.1~esm9
  • libdbi-perl Ubuntu Pro 16.04 LTS 1.634-1ubuntu0.2+esm5
  • libdbi-perl Ubuntu Pro 18.04 LTS 1.640-1ubuntu0.3+esm4
  • libdbi-perl Ubuntu Pro 20.04 LTS 1.643-1ubuntu0.1+esm4

ubuntu advisories UBUNTU-CVE-2026-88816

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • perl-DBI SLE Module for Basesystem 15 SP7 1.647.0-150600.12.26.1
  • perl-DBI SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 1.642-150200.3.26.1
  • perl-DBI SLES LTSS Extended Security 12 SP5 1.628-5.29.1

suse advisories SUSE-SU-2026:4805-1SUSE-SU-2026:4612-1SUSE-SU-2026:4442-1

  • perl-DBI openSUSE Tumbleweed 1.655.0-1.1

opensuse advisories openSUSE-SU-2026:11966-1

  • perl-DBI Azure Linux 3.0 1.655-1

azure linux advisories AZL-105215

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2026-88816 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-88816 updated cvss 5.9

perl-DBI: perl-DBI: Denial of Service via numeric FetchHashKeyName attribute

  • Red Hat Enterprise Linux 6 perl-DBI 1.643-26.el10_2.6
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 perl-DBI 1.643-26.el10_2.6 Red Hat Enterprise Linux 8 perl-DBI, perl-DBI 1.643-26.el10_2.6 Red Hat Enterprise Linux 9 perl-DBI, perl-DBI 1.643-26.el10_2.6 Red Hat Enterprise Linux 10 perl-DBI 1.643-26.el10_2.6
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/perl5-dbi/dbi/security/advisories/GHSA-f4qx-mr9m-q2hq referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

Weakness
  • CWE-843 Access of Resource Using Incompatible Type

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of perl5-dbi/dbi published their own advisory on GitHub. Reviewed sources take precedence over it.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.