Read the docs
TI-2026-42018 Aliases CVE-2026-58403

Hugo symlink confinement bypass in os.ReadFile

Priority LOW 27CWE-59Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
Present
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-59 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00475 41st percentileScored 2026-11-07
Fix Fixed hugo (gohugoio): 0.163.1Red Hat: 1 advisory

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
gohugoiohugo0.123.0 to before 0.163.10.163.1Patch availableCNA
  • hugo Vendorgohugoio Affected 0.123.0 to before 0.163.1 Fixed in 0.163.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:gohugo:hugo:*:*:*:*:*:*:*:*0.123.0 to before 0.163.1Vulnerablegohugoio
  • cpe:2.3:a:gohugo:hugo:*:*:*:*:*:*:*:* Versions 0.123.0 to before 0.163.1 Vulnerable ·gohugoio

Remediation

  • Fix · CNA hugo (gohugoio) Fixed in 0.163.1

Red Hat 1 advisory

  • RHSA-2026:36862 Released 2026-07-08 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images hugo-main@aarch64, hugo-main@src, hugo-main@x86_64

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Hardened ImagesFixed RHSA-2026:36862

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-58403

References

Patch 1

Advisory 1

Other 2

  • TI-2026-64848 Hugo before v0.166.0 Path Traversal via Symlinked Mount Roots CVSS 4.0HIGH 8.7
  • TI-2026-64846 Hugo v0.161.0 to v0.165.0 Arbitrary File Read via Symlinks CVSS 4.0HIGH 8.7
  • TI-2026-53153 Hugo 0.162.0 to 0.164.x - Node Permission Model Bypass via Default TailwindCSS Child-Process Grant CVSS 4.0CRITICAL 9.3
  • TI-2020-16105 Hugo can execute a binary from the current directory on Windows CVSS 3.1HIGH 8.5
  • TI-2026-64849 Hugo v0.162.0 before v0.166.0 IP-literal Deny Rule Bypass CVSS 4.0HIGH 8.6
  • TI-2026-32270 Hugo: Node tool execution allows file system access outside the project directory CVSS 4.0MEDIUM 6.2
See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences