folkertvanheusden MultiTail up to 7.1.5 Execute-on-match Feature mt.c check_filter_exec os command injection

Summaryinfo

A vulnerability, which was classified as problematic, was found in folkertvanheusden MultiTail up to 7.1.5. This affects the function check_filter_exec of the file mt.c of the component Execute-on-match Feature. Such manipulation leads to os command injection. This vulnerability is documented as CVE-2026-55601. The attack needs to be performed locally. There is not any exploit available.

Detailsinfo

A vulnerability was found in folkertvanheusden MultiTail up to 7.1.5. It has been rated as problematic. Affected by this issue is the function check_filter_exec of the file mt.c of the component Execute-on-match Feature. The manipulation 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 when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

MultiTail is a utility for monitoring multiple log files in one terminal. In version 7.1.5 and earlier, the -ex and -eX execute-on-match feature appended attacker-controlled matched input to a configured command inside double quotes, then check_filter_exec() in mt.c passed the constructed command through execute_program() in exec.c to sh -c. Partial escaping left shell metacharacters such as command substitution active, allowing an attacker who could influence monitored input to execute commands as the user running MultiTail. No fixed release is available as of this review.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-55601 since 06/17/2026. The exploitation is known to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• folkertvanheusden

Name

• MultiTail

Version

• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4
• 7.1.5

Website

• Product: https://github.com/folkertvanheusden/multitail/

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