{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-29186", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-04T14:44:00.714Z", "datePublished": "2026-03-07T15:03:51.422Z", "dateUpdated": "2026-07-15T01:10:31.895Z" }, "containers": { "cna": { "title": "@backstage/plugin-techdocs-node: TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution", "problemTypes": [ { "descriptions": [ { "cweId": "CWE-434", "lang": "en", "description": "CWE-434: Unrestricted Upload of File with Dangerous Type", "type": "CWE" } ] }, { "descriptions": [ { "cweId": "CWE-74", "lang": "en", "description": "CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')", "type": "CWE" } ] } ], "metrics": [ { "cvssV3_1": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 7.7, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L", "version": "3.1" } } ], "references": [ { "name": "https://github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrw", "tags": [ "x_refsource_CONFIRM" ], "url": "https://github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrw" } ], "affected": [ { "vendor": "backstage", "product": "backstage", "versions": [ { "version": "< 1.14.3", "status": "affected" } ] } ], "providerMetadata": { "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-07T15:03:51.422Z" }, "descriptions": [ { "lang": "en", "value": "Backstage is an open framework for building developer portals. Prior to version 1.14.3, this is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. A gap in this allowlist allows attackers to craft an mkdocs.yml that causes arbitrary Python code execution, completely bypassing TechDocs' security controls. This issue has been patched in version 1.14.3." } ], "source": { "advisory": "GHSA-928r-fm4v-mvrw", "discovery": "UNKNOWN" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-29186", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-03-09T20:15:04.131913Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-09T20:24:16.895Z" } }, { "affected": [ { "collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": [ "cpe:/a:redhat:rhdh:1.8::el9" ], "defaultStatus": "affected", "packageName": "rhdh/rhdh-hub-rhel9", "product": "Red Hat Developer Hub 1.8", "vendor": "Red Hat", "versions": [ { "lessThan": "*", "status": "unaffected", "version": "1776784286", "versionType": "rpm" } ] }, { "collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": [ "cpe:/a:redhat:rhdh:1.9::el9" ], "defaultStatus": "affected", "packageName": "rhdh/rhdh-hub-rhel9", "product": "Red Hat Developer Hub 1.9", "vendor": "Red Hat", "versions": [ { "lessThan": "*", "status": "unaffected", "version": "1777903262", "versionType": "rpm" } ] }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:ansible_portal:2" ], "defaultStatus": "affected", "packageName": "ansible-automation-platform/automation-portal", "product": "Self-service automation portal 2", "vendor": "Red Hat" } ], "datePublic": "2026-03-07T15:03:51.422Z", "descriptions": [ { "lang": "en", "value": "A flaw was found in Backstage. The backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. A gap in this allowlist allows attackers to craft an mkdocs.yml file that causes arbitrary Python code execution." } ], "metrics": [ { "other": { "content": { "namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L", "version": "3.1" }, "format": "CVSS" } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-791", "description": "Incomplete Filtering of Special Elements", "lang": "en", "type": "CWE" } ] } ], "references": [ { "tags": [ "vdb-entry", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/security/cve/CVE-2026-29186" }, { "name": "RHBZ#2445480", "tags": [ "issue-tracking", "x_refsource_REDHAT" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2445480" }, { "tags": [ "x_sadp-csaf-vex" ], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29186.json" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:9742" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:13826" } ], "solutions": [ { "lang": "en", "value": "RHSA-2026:9742: Red Hat Developer Hub 1.8" }, { "lang": "en", "value": "RHSA-2026:13826: Red Hat Developer Hub 1.9" } ], "timeline": [ { "lang": "en", "time": "2026-03-07T16:01:40.949Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-03-07T15:03:51.422Z", "value": "Made public." } ], "title": "backstage/plugin-techdocs-node: TechDocs Mkdocs configuration key enables arbitrary code execution", "workarounds": [ { "lang": "en", "value": "To mitigate this issue, enable docker isolation by updating the Backstage configuration to use 'runIn: docker' instead of 'runIn: local', confining the arbitrary Python code execution to a containerized environment. Additionally, limit commit access to repositories tracked by Backstage to trusted contributors only, and enforce mandatory pull request (PR) reviews for any modifications made to the mkdocs.yml file." } ], "x_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-15T01:10:31.895Z" } } ] } }