Skip to content
Fencer Vulns
high 7.5

CVE-2026-88816 json

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

published 2026-09-28 42 d ago modified 2026-09-30 39 d ago also EUVD-2026-88343

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 32%
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

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
39 d ago

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 Vulns 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.

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