Vulnerability Description
Hugo is a static site generator. From v0.123.0 through v0.163.0, Hugo's virtual filesystem is designed so that files under a mount cannot reach outside the mount tree, but a regression caused RootMappingFs.statRoot to call Stat, which follows symlinks, instead of Lstat, so a direct os.ReadFile "somefile" where somefile was a symlink pointing outside the mount would return the target's contents. This effectively let a symlink planted inside a theme or local mount read arbitrary files reachable to the user running hugo. This issue is fixed in v0.163.1.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gohugo | Hugo | >= 0.123.0, < 0.163.1 |
Related Weaknesses (CWE)
References
- https://github.com/gohugoio/hugo/commit/cf9c8f93ca2a2838ce378f9e36d052ac2f79e229Patch
- https://github.com/gohugoio/hugo/pull/15020Issue Tracking
- https://github.com/gohugoio/hugo/releases/tag/v0.163.1Release Notes
- https://github.com/gohugoio/hugo/security/advisories/GHSA-c3wq-j5vh-68rcVendor Advisory
FAQ
What is CVE-2026-58403?
CVE-2026-58403 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Hugo is a static site generator. From v0.123.0 through v0.163.0, Hugo's virtual filesystem is designed so that files under a mount cannot reach outside the mount tree, but a regression caused RootMapp...
How severe is CVE-2026-58403?
CVE-2026-58403 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-58403?
Check the references section above for vendor advisories and patch information. Affected products include: Gohugo Hugo.