CVE-2026-29186 @backstage/plugin-techdocs-node: TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution

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...

CVE-2026-29186

Summary: CVE-2026-29186 affects Backstage prior to version 1.14.3, due to a gap in the allowlist used by the @backstage/plugin-techdocs-node when processing MkDocs configuration keys. This gap enables an attacker to craft an mkdocs.yml that leads to arbitrary Python code execution, bypassing Tech...

CVE-2026-29186

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...

CVE-2026-29186 @backstage/plugin-techdocs-node: TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution

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...

CVE-2026-29186 @backstage/plugin-techdocs-node: TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution

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...

Permissive List of Allowed Inputs

Overview @backstage/plugin-techdocs-node is a Common node.js functionalities for TechDocs, to be shared between techdocs-backend plugin and techdocs-cli Affected versions of this package are vulnerable to Permissive List of Allowed Inputs via the processing of the mkdocs.yml configuration file...

@backstage/plugin-search-backend-module-techdocs (>=0.4.11-next.0, <=0.4.11-next.1), @backstage/plugin-techdocs-backend (>=0.0.0-nightly-20260123025240, <=2.1.5-next.2) +1 more potentially affected by CVE-2026-29186 via @backstage/plugin-techdocs-node (>=1.13.11-next.0, <=1.14.2-next.1)

@backstage/plugin-techdocs-node NPM version =1.13.11-next.0, =0.4.11-next.0, =0.0.0-nightly-20260123025240, =0.0.0-nightly-20260123025240, =1.10.5-next.1 Source cves: CVE-2026-29186 Source advisory: SNYK:JS-BACKSTAGEPLUGINTECHDOCSNODE-15426449...

TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution

Impact 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...

GHSA-928R-FM4V-MVRW TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution

Impact 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...

@backstage/plugin-search-backend-module-techdocs (>=0.4.2-next.0, <=0.4.11-next.1), @backstage/plugin-techdocs-backend (>=0.0.0-nightly-2021111822616, <=2.1.5-next.2) +2 more potentially affected by CVE-2026-29186 via @backstage/plugin-techdocs-node (>=1.0.0, <=1.14.2-next.1)

@backstage/plugin-techdocs-node NPM version =1.0.0, =0.4.2-next.0, =0.0.0-nightly-2021111822616, =0.11.13, =0.0.0-nightly-2021111822616, =1.10.5-next.1 Source cves: CVE-2026-29186 Source advisory: OSV:GHSA-928R-FM4V-MVRW...

PT-2026-23441

Name of the Vulnerable Software and Affected Versions Backstage versions prior to 1.14.3 Description Backstage, an open framework for building developer portals, contains a configuration bypass that can lead to arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlis...

Remote Code Execution (RCE)

@backstage/plugin-techdocs-node is vulnerable to Remote Code Execution RCE. The vulnerability is due to improper sanitization of user-controlled mkdocs.yml configuration specifically MkDocs hooks when TechDocs is configured with runIn: local, which allows an attacker to execute arbitrary Python...

@backstage/plugin-techdocs-node vulnerable to arbitrary code execution via MkDocs hooks

Impact When TechDocs is configured with runIn: local, a malicious actor who can submit or modify a repository's mkdocs.yml file can execute arbitrary Python code on the TechDocs build server via MkDocs hooks configuration. Patches Upgrade to @backstage/plugin-techdocs-node version 1.13.11, 1.14.1...

GHSA-6JR7-99PF-8VGF @backstage/plugin-techdocs-node vulnerable to arbitrary code execution via MkDocs hooks

Impact When TechDocs is configured with runIn: local, a malicious actor who can submit or modify a repository's mkdocs.yml file can execute arbitrary Python code on the TechDocs build server via MkDocs hooks configuration. Patches Upgrade to @backstage/plugin-techdocs-node version 1.13.11, 1.14.1...

@backstage/plugin-techdocs-backend (>=0.0.0-nightly-20260123025240, <=0.0.0-nightly-20260126030220), @techdocs/cli (>=0.0.0-nightly-20260123025240, <=0.0.0-nightly-20260126030220) potentially affected by CVE-2026-25153 via @backstage/plugin-techdocs-node (1.14.0)

@backstage/plugin-techdocs-node NPM version 1.14.0 is affected by a known vulnerability. The following packages have a transitive dependency on @backstage/plugin-techdocs-node and may be impacted: - @backstage/plugin-techdocs-backend =0.0.0-nightly-20260123025240, =0.0.0-nightly-20260123025240,...

GHSA-W669-JJ7H-88M9 @backstage/plugin-techdocs-node vulnerable to possible Path Traversal in TechDocs Local Generator

Impact A path traversal vulnerability in the TechDocs local generator allows attackers to read arbitrary files from the host filesystem when Backstage is configured with techdocs.generator.runIn: local. When processing documentation from untrusted sources, symlinks within the docs directory are...

@backstage/plugin-search-backend-module-techdocs (>=0.4.2-next.0, <=0.4.9-next.1), @backstage/plugin-techdocs-backend (>=0.0.0-nightly-2021111822616, <=2.1.4-next.0) +2 more potentially affected by CVE-2026-25152 via @backstage/plugin-techdocs-node (>=1.0.0, <=1.13.10-next.1)

@backstage/plugin-techdocs-node NPM version =1.0.0, =0.4.2-next.0, =0.0.0-nightly-2021111822616, =0.11.13, =0.0.0-nightly-2021111822616, =1.10.4-next.0 Source cves: CVE-2026-25152 Source advisory: OSV:GHSA-W669-JJ7H-88M9...

@backstage/plugin-techdocs-node vulnerable to possible Path Traversal in TechDocs Local Generator

Impact A path traversal vulnerability in the TechDocs local generator allows attackers to read arbitrary files from the host filesystem when Backstage is configured with techdocs.generator.runIn: local. When processing documentation from untrusted sources, symlinks within the docs directory are...

@backstage/plugin-techdocs-backend (>=0.0.0-nightly-20260123025240, <=0.0.0-nightly-20260126030220), @techdocs/cli (>=0.0.0-nightly-20260123025240, <=0.0.0-nightly-20260126030220) potentially affected by CVE-2026-25152 via @backstage/plugin-techdocs-node (1.14.0)

@backstage/plugin-techdocs-node NPM version 1.14.0 is affected by a known vulnerability. The following packages have a transitive dependency on @backstage/plugin-techdocs-node and may be impacted: - @backstage/plugin-techdocs-backend =0.0.0-nightly-20260123025240, =0.0.0-nightly-20260123025240,...

CVE-2026-25152

Backstage is an open framework for building developer portals, and @backstage/plugin-techdocs-node provides common node.js functionalities for TechDocs. In versions of @backstage/plugin-techdocs-node prior to 1.13.11 and 1.14.1, a path traversal vulnerability in the TechDocs local generator allow...