High (7.5). EPSS 0.6% chance of exploitation in the next 30 days.
art-template's sub-template resolution logic (src/compile/adapter/resolve-filename.js), used by both the include and extend template directives, resolves the target file path via path.resolve(root, filename) with no check afterward that the result remains inside root.
Severity
CVSS 3.1
7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
0.6% chance of exploitation in the next 30 days; higher than 46% of CVEs (scores of 2026-10-31)