CVE-2026-41493 yard: Possible arbitrary path traversal and file access via yard server
Attackers can access arbitrary files on the host machine when using the YARD server to serve documentation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41493?
CVE-2026-41493 is a medium-severity path traversal vulnerability in lsegal yard, published on 8 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
YARD is a Ruby Documentation tool. Prior to version 0.9.42, a path traversal vulnerability was discovered in YARD when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. This issue has been patched in version 0.9.42.
Weakness: CWE-22
Which versions are affected by CVE-2026-41493?
2 open source packages ship an affected version, including yard. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
yard RubyGems | All versions | 0.9.42 |
yard RubyGems | All versions | 0.9.42 |
Products include Yardoc Yard.
How do I fix CVE-2026-41493?
Upgrade yard to 0.9.42 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-41493 being exploited?
There is no known exploitation of CVE-2026-41493 in the wild and no public exploit code.
Other vulnerabilities in lsegal yard
Sources
Also known as DEBIAN-CVE-2026-41493, GHSA-3jfp-46x4-xgfj, OESA-2026-2205, OESA-2026-2206, OESA-2026-2207, OESA-2026-2208 and 2 more.