EnterpriseDB repmgr up to 5.5.0 Event Notification os command injection

Summaryinfo

A vulnerability was found in EnterpriseDB repmgr up to 5.5.0. It has been declared as critical. Affected by this issue is some unknown functionality of the component Event Notification. Such manipulation of the argument event_notification_command/failover_validation_command leads to os command injection. This vulnerability is traded as CVE-2026-122043. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in EnterpriseDB repmgr up to 5.5.0. Affected by this issue is some unknown processing of the component Event Notification. The manipulation of the argument event_notification_command/failover_validation_command with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

repmgr 4.0.0 through 5.5.0 is affected by an OS command injection vulnerability (CWE-78) in event notifications. When event_notification_command is configured, repmgr substitutes the %a (node name), %c (connection string) and %d (details) placeholders into the command and runs it through the shell. %a and %c are inserted without escaping, and %d escapes only double quotes, so shell command substitution still works inside the quoting the documentation recommends. The node name and connection string come from node records in the repmgr.nodes table. An attacker with the credentials of a non-superuser repmgr database user can write a crafted node record and run OS commands, as the operating system user that runs repmgr or repmgrd (usually postgres), on other cluster nodes that process an event using these placeholders. The %a placeholder of failover_validation_command has the same flaw. Deployments whose repmgr database user is a superuser gain no new capability, because a superuser can already run OS commands, and deployments that do not use these placeholders are not affected. The issue is fixed in repmgr 5.5.1. After upgrading, operators must remove any quotes they placed around these placeholders, because a placeholder left inside double quotes is still open to command injection.

The advisory is available at enterprisedb.com. This vulnerability is handled as CVE-2026-122043 since 11/04/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

Upgrading to version 5.5.1 eliminates this vulnerability.

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Productinfo

Vendor

• EnterpriseDB

Name

• repmgr

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5.0

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CPE 2.2info

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