Path traversal in YARD - CVE-2026-41493
Published: April 20, 2026
Vulnerability identifier: #VU126592
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-41493
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to path traversal in yard server when handling unsanitized HTTP requests. A remote attacker can send a specially crafted request to disclose sensitive information.
Only deployments using yard server to serve documentation in untrusted environments without WEBrick and relying on --docroot are vulnerable.
Affected software
YARD
Ubuntu
openEuler
yard (Ubuntu package)
rubygem-yard
rubygem-yard-doc
Ubuntu
openEuler
yard (Ubuntu package)
rubygem-yard
rubygem-yard-doc
How to mitigate CVE-2026-41493
Install security update from vendor's website.
YARD - update to 0.9.42
yard (Ubuntu package) - addressed in versions 0.8.7.6+git20160220-3ubuntu0.1~esm2, 0.9.12-2ubuntu0.1~esm2, 0.9.24-1+deb11u1ubuntu0.1~esm1, 0.9.26-1ubuntu0.1+esm1, 0.9.36-1ubuntu0.1~esm1, 0.9.38-1ubuntu0.1~esm1
rubygem-yard - addressed in versions 0.9.26-4, 0.9.34-3
rubygem-yard-doc - addressed in versions 0.9.26-4, 0.9.34-3
yard (Ubuntu package) - addressed in versions 0.8.7.6+git20160220-3ubuntu0.1~esm2, 0.9.12-2ubuntu0.1~esm2, 0.9.24-1+deb11u1ubuntu0.1~esm1, 0.9.26-1ubuntu0.1+esm1, 0.9.36-1ubuntu0.1~esm1, 0.9.38-1ubuntu0.1~esm1
rubygem-yard - addressed in versions 0.9.26-4, 0.9.34-3
rubygem-yard-doc - addressed in versions 0.9.26-4, 0.9.34-3