Atlassian JIRA: CVE-2026-29786: File Inclusion in Jira Software Data Center

This High severity File Inclusion vulnerability was introduced in versions 9.15.2, 9.16.1, 9.17.1, 10.0.1, 10.1.1, 10.2.1, 10.3.0, 10.4.1, 10.5.1, 10.6.0, 10.7.1, 11.0.1, 11.1.1, 11.2.0, and 11.3.0 of Jira Software Data Center.
This File Inclusion vulnerability, with a CVSS Score of 8.2 and a CVSS Vector of CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI😛/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L allows an unauthenticated attacker to get the application to display the contents of a local file, or execute a different files already stored locally on the server.
Atlassian recommends that Jira Software Data Center customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions:
* Jira Software Data Center 10.3: Upgrade to a release greater than or equal to 10.3.18
* Jira Software Data Center 11.3: Upgrade to a release greater than or equal to 11.3.5

See the release notes (https://www.atlassian.com/software/jira/download-archives). You can download the latest version of Jira Software Data Center from the download center (https://www.atlassian.com/software/jira/download-archives).
The National Vulnerability Database provides the following description for this vulnerability: node-tar is a full-featured Tar for Node.js. Prior to version 7.5.10, tar can be tricked into creating a hardlink that points outside the extraction directory by using a drive-relative link target such as C:../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This issue has been patched in version 7.5.10.