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Fencer Vulns
critical 9.8

CVE-2026-73193 json

DBI versions before 1.652 for Perl allow a heap out-of-bounds write on 32-bit perl via an integer wraparound in the output buffer size computed by preparse

published 2026-08-15 2 mo ago modified 2026-08-28 2 mo ago also EUVD-2026-59744

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

DBI versions before 1.652 for Perl allow a heap out-of-bounds write on 32-bit perl via an integer wraparound in the output buffer size computed by preparse.

preparse reserves its output buffer with `newSV(strlen(statement) * 7 + 16)`, budgeting seven output bytes per input byte for the longest ':p99999' expansion. The product is computed in STRLEN, which is 32 bits wide on a 32-bit perl build, so a statement of 613,566,757 bytes multiplies to 4,294,967,299, wraps modulo 2^32 to 3, and reserves 19 bytes. The parser then copies the statement out through a raw pointer with no capacity check, writing the whole 585 MB input past the end of the allocation. The 99,999 placeholder limit does not bound this path, which is reached by ordinary non-placeholder content.

Any caller that passes an untrusted statement of that length to preparse on a 32-bit perl gets a heap out-of-bounds write of attacker controlled bytes. Builds with a 64-bit STRLEN are not affected, since the wrap there needs a statement of about 2.3 exabytes.

Patch / fix

  • libdbi-perl Debian 12 1.643-4+deb12u2
  • libdbi-perl Debian 13 1.652-2~deb13u1
  • libdbi-perl Debian 14 1.652-1

debian advisories DEBIAN-CVE-2026-73193

  • libdbi-perl Ubuntu 22.04 LTS 1.643-3ubuntu0.3
  • libdbi-perl Ubuntu 24.04 LTS 1.643-4ubuntu0.3
  • libdbi-perl Ubuntu 26.04 LTS 1.647-1ubuntu0.26.04.3
  • libdbi-perl Ubuntu Pro 14.04 LTS 1.630-1ubuntu0.1~esm8
  • libdbi-perl Ubuntu Pro 16.04 LTS 1.634-1ubuntu0.2+esm4
  • libdbi-perl Ubuntu Pro 18.04 LTS 1.640-1ubuntu0.3+esm3
  • libdbi-perl Ubuntu Pro 20.04 LTS 1.643-1ubuntu0.1+esm3

ubuntu advisories UBUNTU-CVE-2026-73193

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 openSUSE Tumbleweed 1.653.0-1.1

opensuse advisories openSUSE-SU-2026:11754-1

  • perl-DBI Azure Linux 3.0 1.652-1

azure linux advisories AZL-96701

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-2026-73193 updated cvss 7.8

perl-DBI: DBI: Arbitrary Code Execution on 32-bit Perl via Integer Wraparound

  • Red Hat Enterprise Linux 6 perl-DBI 1.643-26.el10_2.3
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 perl-DBI 1.643-26.el10_2.3
    affected: no fix available
  • Red Hat Enterprise Linux 8 perl-DBI, perl-DBI 1.643-26.el10_2.3 Red Hat Enterprise Linux 9 perl-DBI, perl-DBI 1.643-26.el10_2.3 Red Hat Enterprise Linux 10 perl-DBI 1.643-26.el10_2.3
    not affected: vulnerable code not present

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
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/perl5-dbi/dbi/security/advisories/GHSA-wj3v-c3hh-mhqr referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Classification

Weakness

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.