CVE-2026-100690

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{"affected_release": [{"advisory": "RHSA-2026:66266", "cpe": "cpe:/a:redhat:hummingbird:1", "package": "hugo-main-0.166.0-0.1.hum1", "product_name": "Red Hat Hardened Images", "release_date": "2026-09-09T00:00:00Z"}], "bugzilla": {"description": "github.com/gohugoio/hugo: Hugo: Arbitrary file read via symbolic link sandbox escape", "id": "2541815", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541815"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N", "status": "verified"}, "cwe": "CWE-59", "details": ["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.", "A flaw was found in Hugo. This vulnerability allows information disclosure when Hugo executes build tools under the Node.js permission model, which validates only lexical file paths and fails to restrict symbolic links pointing outside the sandbox. An attacker capable of contributing content to a repository can exploit this by committing a symbolic link targeting sensitive host files alongside a build tool that reads it. Consequently, files readable by the build process can be exposed and embedded into the published site."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, implement the following operational controls:\n1. Avoid processing untrusted pull requests, themes, or repository branches that execute Node.js transformation pipelines (such as PostCSS, TailwindCSS, or Babel). Builds that do not execute Node.js tools are unaffected.\n2. Isolate Hugo builds inside dedicated containers or ephemeral sandboxes that have no sensitive host directories or files mounted, and run the build process with minimal privileges.\nCaveat: Disabling or avoiding Node.js asset transformations may prevent custom stylesheets or scripts from compiling properly, which can alter the appearance or functionality of the generated site."}, "name": "CVE-2026-100690", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "grafana", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Fix deferred", "package_name": "grafana12.4", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Fix deferred", "package_name": "grafana13.1", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Fix deferred", "package_name": "grafana13.2", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift_gitops:1", "fix_state": "Affected", "package_name": "openshift-gitops-1/argocd-rhel8", "product_name": "Red Hat OpenShift GitOps"}, {"cpe": "cpe:/a:redhat:openshift_gitops:1", "fix_state": "Affected", "package_name": "openshift-gitops-1/argocd-rhel9", "product_name": "Red Hat OpenShift GitOps"}, {"cpe": "cpe:/a:redhat:openstack:18.0", "fix_state": "Affected", "package_name": "rhoso-operators/openstack-operator-bundle", "product_name": "Red Hat OpenStack Platform 18.0"}], "public_date": "2026-09-26T13:23:49Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-100690\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-100690\nhttps://github.com/gohugoio/hugo/security/advisories/GHSA-x3mx-cm49-8m9c\nhttps://www.vulncheck.com/advisories/hugo-0.161.0-to-0.165.0-arbitrary-file-read-via-symlinks"], "statement": "This vulnerability is rated as Moderate impact because successful exploitation requires processing an untrusted project or pull request that specifically utilizes Node.js asset pipelines. Although an attacker could expose sensitive local files accessible to the builder by introducing malicious symlinks into the source tree, this flaw cannot be exploited remotely without direct user interaction or automated build triggers. Build systems and projects that only process trusted content or do not invoke Node.js asset transformations are not at risk.", "threat_severity": "Moderate"}

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