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Fencer Vulns
high 8.4

CVE-2026-100693 json

Hugo v0.162.0 before v0.166.0 IP-literal Deny Rule Bypass

published 2026-09-26 43 d ago modified 2026-09-30 39 d ago also EUVD-2026-87666

cvss
8.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

Hugo versions from v0.162.0 before v0.166.0 contain a case-sensitive validation flaw in the security.http.urls IP-literal deny rule that allows attackers to bypass restrictions. Attackers can use mixed-case URL schemes in resources.GetRemote calls to fetch from restricted IP addresses like localhost.

Patch / fix

  • gohugoio hugo 0.166.0
  • hugo Debian 14 0.166.0-1

debian advisories DEBIAN-CVE-2026-100693

  • 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-2026-100693 updated cvss 4.0

github.com/gohugoio/hugo: Hugo: Security restriction bypass via mixed-case URL schemes

  • Red Hat Hardened Images hugo 0.166.0-0.1.hum1
    fixed: vendor fix “Do not pass untrusted URLs to resources.GetRemote. Where remote fetching is required, configure security.http.urls with an explicit allowlist of trusted hosts.” RHSA-2026:66266
  • 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 OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9 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
no
Technical impact
total
Assessed
39 d ago

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.6 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 3.1 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 4.0 8.6 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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-178 Improper Handling of Case Sensitivity

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.