separators and dot segmentsfast-uri up to 3.1.0 path traversal

Summaryinfo

A vulnerability labeled as critical has been found in separators and dot segmentsfast-uri up to 3.1.0. Affected by this vulnerability is an unknown functionality. Executing a manipulation can lead to path traversal. This vulnerability is tracked as CVE-2026-6321. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in separators and dot segmentsfast-uri up to 3.1.0. It has been declared as critical. This vulnerability affects an unknown part. 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 integrity, and availability. CVE summarizes:

fast-uri decoded percent-encoded path separators and dot segments before applying dot-segment removal in its normalize() and equal() functions. Encoded path data was treated like real slashes and parent-directory references, so distinct URIs could collapse onto the same normalized path. Applications that normalize or compare attacker-controlled URLs to enforce path-based policy can be bypassed, with a path that appears confined under an allowed prefix normalizing to a different location. Versions <= 3.1.0 are affected. Update to 3.1.1 or later.

The advisory is available at github.com. This vulnerability was named CVE-2026-6321 since 04/14/2026. 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. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 315089 (Fedora 42 : python-jupytext (2026-793b55138d)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.1.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (315089), EUVD (EUVD-2026-27129) and CERT Bund (WID-SEC-2026-2460). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

• Red Hat Enterprise Linux
• Oracle Linux
• Atlassian Bamboo
• Atlassian Bitbucket
• Atlassian Confluence
• Atlassian Fisheye
• Atlassian Crucible
• Atlassian Jira

Productinfo

Name

• separators and dot segmentsfast-uri

Version

• 3.0
• 3.1.0

CPE 2.3info

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CPE 2.2info

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

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