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Fencer Vulns
high 7.5

CVE-2026-100690 json

Hugo v0.161.0 to v0.165.0 Arbitrary File Read via Symlinks

published 2026-09-26 43 d ago modified 2026-09-30 39 d ago also EUVD-2026-87663

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits
0
none known

Summary

Hugo versions from v0.161.0 through v0.165.0 run Node.js tools (css.PostCSS, css.TailwindCSS, js.Babel) under the Node.js permission model to restrict file system reads to the project directory and configured mounts. Because the Node.js permission model validates only the lexical path and follows symbolic links that point outside the allowed set, Hugo did not detect symlinks escaping the sandbox. An attacker who can contribute content to a Hugo project (for example via a pull request) can commit a symlink such as assets/css/x.css -> /etc/passwd together with a PostCSS plugin that reads it, allowing any file readable by the Hugo build process to be disclosed and potentially embedded in the published site. This affects builds using the default security configuration; projects that do not invoke Node.js tools are unaffected. Fixed in v0.166.0, which scans allowed paths and fails the build when a symbolic link resolves outside them.

Patch / fix

  • gohugoio hugo 0.166.0
  • hugo Debian 14 0.166.0-1

debian advisories DEBIAN-CVE-2026-100690

  • hugo hummingbird 1 0.166.0-0.1.hum1

red hat advisories RHSA-2026:66266

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-100690 updated cvss 5.5

github.com/gohugoio/hugo: Hugo: Arbitrary file read via symbolic link sandbox escape

  • Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Cluster Observability Operator 1.5 cluster-observability-operator/korrel8r-rhel9 1790854490
    fixed: vendor fix RHSA-2026:74609
  • Red Hat Hardened Images hugo 0.166.0-0.1.hum1
    fixed: vendor fix RHSA-2026:66266
  • Red Hat Cluster Observability Operator 1.5 cluster-observability-operator/perses-rhel9 1790854501, cluster-observability-operator/thanos-rhel9 1790854526, cluster-observability-operator/prometheus-rhel9 1790857922, cluster-observability-operator/alertmanager-rhel9 1790854499, cluster-observability-operator/perses-rhel9-operator 1790854601, cluster-observability-operator/logging-console-plugin-rhel9 1790854474, +18 more Red Hat Enterprise Linux 10 grafana 12.4.3-2.el10
    not affected: vulnerable code not present
  • Red Hat Hardened Images grafana13.1 13.1.6-0.3.hum1, grafana13.2 13.2.1-0.6.hum1, grafana12.4 12.4.10-0.7.hum1
    not affected: component not present
  • Red Hat OpenStack Platform 18.0 rhoso-operators/openstack-operator-bundle
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
39 d ago

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 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
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • gohugoio hugo

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.