CVE-2026-73193 Affecting libdbi-perl package, versions <1.640-1ubuntu0.3+esm3


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.65% (49th percentile)

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  • Snyk IDSNYK-UBUNTU1804-LIBDBIPERL-18868675
  • published30 Sept 2026
  • disclosed15 Aug 2026

Introduced: 15 Aug 2026

CVE-2026-73193  (opens in a new tab)

How to fix?

Upgrade Ubuntu:18.04 libdbi-perl to version 1.640-1ubuntu0.3+esm3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libdbi-perl package and not the libdbi-perl package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1