rsyslog up to 8.2610.0 Dynafacility path traversal

Summaryinfo

A vulnerability labeled as very critical has been found in rsyslog up to 8.2610.0. This impacts an unknown function of the component Dynafacility. Executing a manipulation can lead to path traversal. This vulnerability is tracked as CVE-2026-92709. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in rsyslog up to 8.2610.0. It has been declared as very critical. This vulnerability affects an unknown part of the component Dynafacility. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Rsyslog is a rocket-fast system for log processing. From versions 1.15.0 to 8.2610.0, rsyslog's omfile dynaFile facility intentionally allows templates to generate flexible output paths. This supports valid deployments that route logs into different directories or use dynamically generated file names. A deployment becomes unsafe when a dynaFile template uses a value influenced by untrusted input as a path component without explicit secure-path handling. In that configuration, the rendered path can escape the operator's intended log directory. This is not limited to the RFC5424 HOSTNAME field. Any untrusted value that reaches a dynaFile path component can create the condition. At time of publication, there are no publicly available patches.

The advisory is available at github.com. This vulnerability was named CVE-2026-92709 since 09/16/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/22/2026). This vulnerability is assigned to T1006 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.

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Productinfo

Name

• rsyslog

Version

• 8.2610

Website

• Product: https://github.com/rsyslog/rsyslog/

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