Dbi - CraftedSignal Threat Feedhttps://feed.craftedsignal.io/tags/dbi/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioSat, 11 Jul 2026 07:40:01 +0000CVE-2026-14739 DBI for Perl Heap Overflow Vulnerabilityhttps://feed.craftedsignal.io/briefs/2026-07-cve-2026-14739-dbi-perl-heap-overflow/Sat, 11 Jul 2026 07:40:01 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-07-cve-2026-14739-dbi-perl-heap-overflow/CVE-2026-14739 details a heap overflow vulnerability affecting DBI for Perl versions prior to 1.650, which arises during the preparsing of SQL statements with an excessive number of placeholders, potentially leading to arbitrary code execution or a denial of service.The Microsoft Security Response Center (MSRC) has published details regarding CVE-2026-14739, a critical heap overflow vulnerability affecting versions of the DBI module for Perl prior to 1.650. This flaw can be triggered when the DBI module attempts to preparse SQL statements containing an extremely large number of placeholders. Successful exploitation could lead to memory corruption, potentially enabling an attacker to execute arbitrary code within the context of the affected application or cause a denial of service (DoS) by crashing the application. This vulnerability highlights the importance for organizations to maintain updated third-party dependencies, even in widely used languages like Perl, to mitigate risks associated with memory corruption and potential system compromise.

Attack Chain

  1. An attacker crafts a malicious SQL statement containing an extremely large number of placeholders.
  2. The attacker submits this malformed SQL statement to a vulnerable application utilizing the Perl DBI module (versions prior to 1.650).
  3. The vulnerable DBI module attempts to preparse the crafted SQL statement for execution.
  4. During the preparsing operation, the excessive number of placeholders triggers a heap overflow condition.
  5. This heap overflow leads to memory corruption within the application's process space.
  6. Depending on the specific memory corruption, the attacker may achieve arbitrary code execution on the underlying system.
  7. Alternatively, the memory corruption can cause the application to crash, resulting in a denial of service.

Impact

Successful exploitation of CVE-2026-14739 could allow an attacker to gain control over the affected system by executing arbitrary code. Alternatively, the vulnerability could be used to trigger a denial of service, rendering critical applications unavailable. The extent of the impact depends on the privileges of the affected Perl application and the sensitivity of the data it processes. Organizations using vulnerable versions of the DBI module are at risk of system compromise or operational disruption if their applications process untrusted SQL input.

Recommendation

  • Immediately update the DBI module for Perl to version 1.650 or later to patch CVE-2026-14739.
  • Review applications utilizing Perl's DBI module to ensure they are processing SQL statements with parameterized queries safely and are not susceptible to excessive placeholder input from untrusted sources.
  • Monitor application logs for unexpected crashes or errors related to database interactions, which might indicate attempted exploitation of CVE-2026-14739.
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