Aiven-Open karapace up to 5.x Backup Reader backend.py path traversal

Summaryinfo

A vulnerability was found in Aiven-Open karapace up to 5.x. It has been rated as critical. This vulnerability affects unknown code of the file backup/backends/v3/backend.py of the component Backup Reader. Performing a manipulation results in path traversal. This vulnerability is identified as CVE-2026-29190. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Aiven-Open karapace up to 5.x. This affects an unknown function of the file backup/backends/v3/backend.py of the component Backup Reader. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality. The summary by CVE is:

Karapace is an open-source implementation of Kafka REST and Schema Registry. Prior to version 6.0.0, there is a Path Traversal vulnerability in the backup reader (backup/backends/v3/backend.py). If a malicious backup file is provided to Karapace, an attacker may exploit insufficient path validation to perform arbitrary file read on the system where Karapace is running. The issue affects deployments that use the backup/restore functionality and process backups from untrusted sources. The impact depends on the file system permissions of the Karapace process. This issue has been patched in version 6.0.0.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-29190 since 03/04/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The exploitation needs additional levels of successful authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 6.0.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-10147). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Aiven-Open

Name

• karapace

Version

• 5.x

Website

• Product: https://github.com/Aiven-Open/karapace/

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