CVE-2026-14740: DBI versions before 1.650 for Perl read one byte out-of-bounds in preparse when deleting an initial SQL commen

Q: How do I fix CVE-2026-14740?

dbi: upgrade to 1.650. Exact commands for each OS are on this page.

Q: Is CVE-2026-14740 being exploited?

CVE-2026-14740 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-14740 affect?

CVE-2026-14740 affects dbi. Severity is critical (CVSS 9.1). DBI versions before 1.650 for Perl read one byte out-of-bounds in preparse when deleting an initial SQL comment. The preparse method normalises SQL and removes comments. When the SQL starts with a comment line, the deletion of that line du

Q: How urgent is CVE-2026-14740?

Priority 53/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-14740 is a critical-severity flaw (CVSS 9.1) affecting dbi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

DBI versions before 1.650 for Perl read one byte out-of-bounds in preparse when deleting an initial SQL comment. The preparse method normalises SQL and removes comments. When the SQL starts with a comment line, the deletion of that line during normalisation led to an out-of-bounds read by one byte. The result is a fault on memory-hardened builds and nondeterministic newline retention on normal builds.

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-07-07
Last modified	2026-10-25

Publisher (CNA): CPANSec · Vendor: perl

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-07 23:16 UTCPublished CVE record published
2026-10-25 20:10 UTCUpdated Record last modified

perl dbi UPGRADE

Affected: < 1.650

Fixed in: 1.650

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy dbi || rpm -q dbi || dbi --version

2. UPGRADE to 1.650 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade dbi

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade dbi

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · python-apprise · FIXED · 2.1.0-1.fc46 · FEDORA-2026-ef67a72c5d · source

sudo dnf upgrade --advisory=FEDORA-2026-ef67a72c5d

Debian 12 · libdbi-perl · FIXED · 1.643-4+deb12u2

sudo apt update && sudo apt install --only-upgrade libdbi-perl dpkg --compare-versions "$(dpkg-query -W -f='${Version}' libdbi-perl)" ge "1.643-4+deb12u2" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · libdbi-perl · FIXED · 1.652-2~deb13u1

sudo apt update && sudo apt install --only-upgrade libdbi-perl dpkg --compare-versions "$(dpkg-query -W -f='${Version}' libdbi-perl)" ge "1.652-2~deb13u1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · perl-DBI · DEFERRED

RHEL 6 · perl-DBI · DEFERRED

RHEL 7 · perl-DBI · DEFERRED

RHEL 8 · perl-DBI · DEFERRED

RHEL 8 · perl-DBI:1.641/perl-DBI · DEFERRED

Alpine 3.24 · perl-dbi · FIXED · perl-dbi-1.651-r0

apk add --upgrade perl-dbi apk info -v perl-dbi

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-1982 · source

sudo dnf update --advisory=ALAS2023-2026-1982

Amazon Linux 2 · see advisory · FIXED · ALAS2-2026-3825 · source

sudo yum update --advisory=ALAS2-2026-3825

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: metacpan.org/release/HMBRAND/DBI-1.650/changes

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-14740?

dbi: upgrade to 1.650. Exact commands for each OS are on this page.

Is CVE-2026-14740 being exploited?

CVE-2026-14740 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-14740 affect?

CVE-2026-14740 affects dbi. Severity is critical (CVSS 9.1). DBI versions before 1.650 for Perl read one byte out-of-bounds in preparse when deleting an initial SQL comment. The preparse method normalises SQL and removes comments. When the SQL starts with a comment line, the deletion of that line du

How urgent is CVE-2026-14740?

Priority 53/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

Perl vulnerabilities

Related CVEs

CVE-2026-14739 CRITICAL 9.8 UPGRADE DBI versions before 1.650 for Perl have a heap overflow when preparsing SQL statements with an extreme number
CVE-2026-14380 HIGH 8.8 UPGRADE DBI versions before 1.650 for Perl are vulnerable to code injection via caller-influenced Profile. When a str

References

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