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TI-2026-71360 Aliases CVE-2026-109595GHSA-6cfm-3xc5-q3r5

Hugo path traversal in js.Build ESBuild resolver exposes files outside project

Priority LOW 29CWE-22Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 1 fixed, 3 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-22 and the CVSS impact.

Summary

Hugo from v0.84.0 before v0.167.0 contains a path traversal vulnerability (CWE-22) in the ESBuild fallback resolver used by js.Build, js.Batch, and css.Build. Malicious themes or modules can ship relative imports or symlinks that point outside the project root, so a build can bundle any file readable by the build user into published JavaScript or CSS output. The CVSS 4.0 base score is 6.7 (MEDIUM).

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

Hugo from v0.84.0 before v0.167.0 contains a path traversal vulnerability that allows malicious themes or modules to read files outside the project root via ESBuild's fallback resolver in js.Build, js.Batch, and css.Build. Attackers can ship relative imports or symlinks pointing outside the project to bundle any file readable by the build user into published JavaScript or CSS output.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00144 3rd percentileScored 2026-11-08
Fix Partial hugo (gohugoio): 0.167.0Red Hat: 1 advisoryRed Hat: 1 fixed, 3 without a fix

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
gohugoiohugo0.84.0 to before 0.167.00.167.0Patch availableCNA
  • hugo Vendorgohugoio Affected 0.84.0 to before 0.167.0 Fixed in 0.167.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:gohugo:hugo:*:*:*:*:*:*:*:*——gohugoio
  • cpe:2.3:a:gohugo:hugo:*:*:*:*:*:*:*:* Versions — — ·gohugoio

Remediation

Upgrade Hugo to v0.167.0. Red Hat Hardened Images are fixed by RHSA-2026:80677, while Red Hat Enterprise Linux 10, Red Hat OpenShift GitOps, and Red Hat OpenStack Platform 18.0 have no fix available yet.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA hugo (gohugoio) Fixed in 0.167.0

Red Hat 1 advisory

  • RHSA-2026:80677 Released 2026-10-12 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images hugo-0.167.0-0.2.hum1@aarch64, hugo-0.167.0-0.2.hum1@s390x, hugo-0.167.0-0.2.hum1@src +1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    gohugoio hugo 0.167.0

    4 records Highest priority Priority LOW 4 LOW

    Other records, highest priority first

    • TI-2026-71361 Symlink following in Hugo exposes files outside theme rootPriority LOW 29
    • TI-2026-71359 Path traversal in Hugo css.Sass exposes files outside project rootPriority LOW 29
    • TI-2026-71362 Stored cross-site scripting in Hugo via table of contents heading IDsPriority LOW 22
    Show all 4 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat OpenShift GitOpsAffectedNo fix yet: Fix deferred
Red Hat OpenStack Platform 18.0AffectedNo fix yet: Fix deferred
Red Hat Hardened ImagesFixed RHSA-2026:80677
Not affected: 1 product
  • Red Hat Hardened Images

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-109595
  2. 2026-10-13 Alias added: GHSA-6cfm-3xc5-q3r5
  3. 2026-10-13 Priority changed: MEDIUM → LOW
  4. 2026-10-16 CISA SSVC decision points changed
  5. 2026-10-20 Fix available: RHSA-2026:80677 · Red Hat
  6. 2026-10-20 Fix available: Red Hat Hardened Images · Red Hat
  7. 2026-10-20 CVSS score added · Red Hat

References

Advisory 1

  • TI-2026-60433 Hugo before v0.165.0 Insufficient Permission Restriction via TailwindCSS CVSS 4.0CRITICAL 9.3
  • TI-2026-60432 Hugo before v0.165.0 Symlink Confinement Bypass via resources.Get CVSS 4.0CRITICAL 9.3
  • 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
See all 24 →

Sources

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