External risk intelligence

DBI for Perl Out-of-Bounds Read Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-14740

The vulnerability exists in a Perl database interface module (DBI) used by developers to interact with databases. It is a library component integrated into applications rather than a standalone network-facing service, gateway, or application. Its typical usage is internal to the application code, making direct public internet exposure of this specific memory-handling flaw unlikely.

Out-of-bounds Read

Perl Dbi

before 1.650

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory details a critical vulnerability in a Perl database interface module that can lead to application crashes or unpredictable behavior. While the issue stems from a low-level memory access error, its direct exploitation over the network is considered unlikely due to the module's typical integration within application code. The main concern is confirming whether this module is in use and if the specific function triggering the vulnerability is exercised.

A coding error causes unexpected application behavior.
Critical flaw in a core database connector library.
Confirm usage and exposure of this database component.

Attack Path

How an attacker could exploit the issue

An attacker could trigger a vulnerability in the DBI Perl module by sending specially crafted SQL queries. When the module attempts to process SQL statements that begin with a comment, it miscalculates memory boundaries during comment removal. This can lead to unexpected program termination or unpredictable behavior, depending on how the software is configured.

Requires unauthenticated network access.
Triggered by specially formatted SQL comments.
Leads to denial of service or information disclosure.

Live Threat

Current exploitation, exposure, and threat context

When the SQL begins with a comment, deleting that comment during normalization could lead to an out-of-bounds read. This may cause a fault on memory-hardened builds or unpredictable newline retention on normal builds.

System integrity.
Out-of-bounds read on comment deletion.
Application faults or unexpected behavior.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in the DBI module for Perl requires immediate attention from teams responsible for applications utilizing this database interface. The initial step is to identify all instances of the affected DBI version within your environment. Subsequently, confirm whether these instances are exposed externally or handle sensitive data, and then locate the accountable application or platform owner. A risk-based remediation plan should then be developed, considering maintenance windows and potential vendor coordination.

Application owners should investigate this issue.
Verify external exposure and business criticality.
Plan remediation based on identified risks.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the DBI module for Perl?

DBI stands for Database Interface. It is a standard programming library that allows Perl applications to connect to and interact with various database engines. Developers use it as a core connector to perform tasks like running SQL queries or managing data records. Because it acts as a bridge between the application code and the database, it is often embedded deeply within software architectures rather than running as a standalone service.

What does CWE-125 mean for CVE-2026-14740?

CWE-125 refers to an out-of-bounds read. In the context of CVE-2026-14740, this means the software attempts to read data past the end of a designated memory buffer. This happens specifically when the DBI module tries to remove SQL comments from the start of a query. Because the code miscalculates where the comment ends, it reads one extra byte of memory, which can lead to application crashes on hardened systems or inconsistent data processing.

How is this DBI vulnerability triggered?

The flaw is triggered when the DBI library processes an SQL query that begins with a comment line. When the module attempts to normalize the SQL by stripping out that comment, the underlying memory boundary error occurs. Importantly, standard SQL queries that do not start with a comment are not affected by this specific memory access error, as the problematic deletion logic is not invoked in those scenarios.

Is my application at risk from CVE-2026-14740?

According to Halo Surface Signal, this vulnerability is very unlikely to be exposed directly to the internet. Because DBI is a library component embedded within application code, an attacker cannot usually target it directly from the network. While the potential for impact exists if an application passes externally controlled input into a vulnerable DBI function, the library itself is typically hidden behind application logic, reducing its direct public-facing profile.

What should I do if I use affected DBI versions?

Begin by auditing your software inventory to locate any applications relying on DBI versions earlier than 1.650. Once identified, work with the application owners to determine if the software processes SQL input that could contain the specific comment patterns described. Prioritize systems where untrusted user input directly influences database queries, and coordinate with your development teams to schedule an update to a patched version.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.