# CVE-2026-78030: DBI versions before 1.653 for Perl load arbitrary modules via unvalidated dbm_type and dbm_mldbm attributes in DBD::DBM CVE-2026-78030 is fixed in 5 products on 1 platform, first by DEBIAN-CVE-2026-78030, released September 17, 2026. It is not reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/cve/CVE-2026-78030 - Priority: Urgent - CVSS: 9.8 (Critical) - EPSS: 0.0042 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 19, 2026 - Weakness: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78030 ## Description DBI versions before 1.653 for Perl load arbitrary modules via unvalidated dbm_type and dbm_mldbm attributes in DBD::DBM. DBD::DBM passes the dbm_type and dbm_mldbm connect attributes to require without checking that the value names a module. require treats a path-shaped string as a literal filename and does not consult @INC, so the attribute chooses the file that Perl loads and runs. The MLDBM::Serializer:: prefix that DBD::DBM prepends to dbm_mldbm is not a boundary: only the :: separators are rewritten to /, so a value containing / traverses out of the serializer directory. The value is also assigned to $MLDBM::Serializer, which MLDBM requires the same way when it ties the table. A caller that lets an untrusted party influence either attribute, for example through a DSN fragment or a parameter that selects a storage backend, runs the file-scope code of whatever module the value names. For example, my $dsn = "dbi:DBM:f_dir=/var/db;dbm_type=../../Untrusted.pm" my $dbh = DBI->connect( $dsn ); Note that DBD::Gofer forwards connect attributes to the server side, and DBI::ProxyServer checks only that a DSN starts with a driver prefix. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libdbi-perl Debian 12.15 (bookworm) | 1.643-4+deb12u3 | [DEBIAN-CVE-2026-78030](https://patchblox.com/security/data/fix/linux/debian-cve-2026-78030.md) | Sep 17, 2026 | | Linux | libdbi-perl Debian 14 | 1.653-1 | [DEBIAN-CVE-2026-78030](https://patchblox.com/security/data/fix/linux/debian-cve-2026-78030.md) | Sep 17, 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 amzn 2023 | 1.653-1.amzn2023.0.1 | [ALAS2023-2026-3191](https://patchblox.com/security/data/fix/linux/alas2023-2026-3191.md) | Nov 7, 2026 | | Linux | perl-DBI opensuse-leap 16.0 | 1.647.0-160000.6.1 | [OPENSUSE-SU-2026:21960-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21960-1.md) | Sep 25, 2026 | | Linux | perl-DBI sles 15.6 | 1.647.0-150600.12.21.1 | [SUSE-SU-2026:4386-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4386-1.md) | Sep 29, 2026 | | Linux | perl-DBI sles 15.7 | 1.647.0-150600.12.21.1 | [SUSE-SU-2026:4386-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4386-1.md) | Sep 29, 2026 | | Linux | perl-DBI sles 16.0 | 1.647.0-160000.6.1 | [SUSE-SU-2026:23919-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23919-1.md) | Sep 25, 2026 | | Linux | perl-DBI-debuginfo amzn 2023 | 1.653-1.amzn2023.0.1 | [ALAS2023-2026-3191](https://patchblox.com/security/data/fix/linux/alas2023-2026-3191.md) | Nov 7, 2026 | | Linux | perl-DBI-debugsource amzn 2023 | 1.653-1.amzn2023.0.1 | [ALAS2023-2026-3191](https://patchblox.com/security/data/fix/linux/alas2023-2026-3191.md) | Nov 7, 2026 | | Linux | perl-DBI-tests amzn 2023 | 1.653-1.amzn2023.0.1 | [ALAS2023-2026-3191](https://patchblox.com/security/data/fix/linux/alas2023-2026-3191.md) | Nov 7, 2026 | --- Data as of 2026-11-08T06:59:42Z 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 Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.