CVE-2026-19546: DBI RCE Vulnerability Fix for RHEL

CVE-2026-19546 Overview

CVE-2026-19546 is a code injection flaw in the Perl DBI (Database Independent Interface) module. Red Hat published the advisory as a corrective fix for an incomplete remediation of CVE-2026-14380, applied to RHEL 9.8.z and RHEL 10.2.z. The weakness is classified under CWE-94: Improper Control of Generation of Code and is reachable over the network by an authenticated attacker with low privileges. Successful exploitation impacts confidentiality, integrity, and availability of the affected system. Refer to the Red Hat CVE-2026-19546 Advisory for the vendor statement.

Critical Impact
An authenticated network attacker can trigger code injection against applications relying on the vulnerable DBI module, leading to compromise of the database interface layer on affected Red Hat Enterprise Linux systems.

Affected Products

Red Hat Enterprise Linux 9.8.z (perl-DBI package)
Red Hat Enterprise Linux 10.2.z (perl-DBI package)
Applications and services on affected RHEL streams that depend on the Perl DBI module

Discovery Timeline

2026-08-11 - CVE-2026-19546 published to the National Vulnerability Database
2026-08-12 - Last updated in NVD database
2026-08-13 - EPSS score published at 0.306% (percentile 23.03)

Technical Details for CVE-2026-19546

Vulnerability Analysis

CVE-2026-19546 is a code injection weakness in the Perl DBI module, the standard database access abstraction used by countless server-side Perl applications. The advisory identifies the issue as an incomplete fix for CVE-2026-14380, meaning residual injection paths remained after the initial patch. Red Hat re-issued the correction specifically for RHEL 9.8.z and RHEL 10.2.z package streams.

Because DBI sits between application code and downstream database drivers (DBD::*), a code injection defect in this layer can influence how statements or driver directives are constructed and executed. Exploitation requires low-privileged authentication and no user interaction, and it can be performed over the network against services that expose DBI-backed functionality.

Root Cause

The root cause is improper control of code generation ([CWE-94]) within the DBI handling paths that CVE-2026-14380 sought to remediate. The prior patch did not fully constrain attacker-influenced input used during code or statement construction, leaving a bypass that Red Hat addresses in this follow-up fix. See the Red Hat Bug Report #2513963 for tracking details.

Attack Vector

The attack is remote and requires an authenticated session with low privileges. An attacker submits crafted input that reaches the vulnerable DBI code path, causing injected content to be evaluated as code within the Perl runtime context of the target application. No user interaction is required, and successful exploitation yields high impact against confidentiality, integrity, and availability.

No public proof-of-concept, exploit code, or in-the-wild exploitation has been reported. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-19546

Indicators of Compromise

Unexpected Perl subprocess spawns or shell invocations originating from processes that load DBI or DBD::* modules.
Anomalous outbound connections or file writes performed by web or middleware services backed by Perl and DBI.
Database query patterns containing embedded Perl syntax, meta-characters, or unexpected quoting sequences appearing in application logs.

Detection Strategies

Inventory endpoints and servers running the perl-DBI package on RHEL 9.8.z and RHEL 10.2.z using rpm -q perl-DBI and compare against the patched version listed in the Red Hat advisory.
Correlate authenticated application sessions with subsequent child-process creation events on hosts running Perl services to identify injection attempts.
Alert on Perl interpreter execution of dynamically constructed code paths where input traces back to network-facing request handlers.

Monitoring Recommendations

Enable process execution and command-line auditing on Linux hosts running Perl-based services and forward events to a centralized analytics platform.
Monitor package inventory drift so that unpatched perl-DBI versions are surfaced immediately after new RHEL errata are published.
Track authentication logs for low-privilege accounts interacting with Perl/DBI-backed services and baseline typical query volumes for anomaly detection.

How to Mitigate CVE-2026-19546

Immediate Actions Required

Apply the Red Hat security errata for perl-DBI on RHEL 9.8.z and RHEL 10.2.z as documented in the Red Hat CVE-2026-19546 Advisory.
Restart Perl-based services and long-running daemons after upgrading perl-DBI to ensure the patched module is loaded into memory.
Audit authenticated accounts with access to DBI-backed applications and revoke unused or over-privileged credentials.

Patch Information

Red Hat has issued updated perl-DBI packages for RHEL 9.8.z and RHEL 10.2.z that correct the incomplete remediation of CVE-2026-14380. Consult the Red Hat CVE-2026-19546 Advisory and Red Hat Bug Report #2513963 for the exact package versions and errata identifiers applicable to your subscribed channels.

Workarounds

Restrict network access to Perl services that use DBI so only trusted, authenticated clients can reach them until patches are deployed.
Enforce strict input validation and parameterized queries at the application layer to reduce the surface for injected content reaching DBI.
Run Perl services under least-privileged system accounts with mandatory access controls such as SELinux in enforcing mode.

bash

# Verify installed perl-DBI version and apply Red Hat errata
rpm -q perl-DBI
sudo dnf --refresh upgrade perl-DBI
sudo systemctl restart <perl-service-name>