conda infrastructure Template Rendering update.yml special elements in template engine

Summaryinfo

A vulnerability classified as critical was found in conda infrastructure. Affected by this vulnerability is an unknown functionality of the file .github/workflows/update.yml of the component Template Rendering. The manipulation results in special elements in template engine. This vulnerability is cataloged as CVE-2026-53942. The attack may be launched remotely. There is no exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as critical, was found in conda infrastructure (version unknown). Affected is an unknown function of the file .github/workflows/update.yml of the component Template Rendering. The manipulation with an unknown input leads to a special elements in template engine vulnerability. CWE is classifying the issue as CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Conda Organization Infrastructure is a centralized location for infrastructure codes. Prior to commit 9c0f238, a GitHub Actions Pwn Request vulnerability appears to remain present in conda/conda. The affected workflow is .github/workflows/update.yml. It is triggered by issue_comment events containing @conda-bot render or @conda-bot recreate. For the render path, the workflow obtains the pull request head repository and branch from the PR API, checks out that PR-controlled repository/ref using secrets.SYNC_TOKEN, and then runs conda/actions/template-files@7f6830b1428a9bd47f0b068892c77eae95207037. The external template-files action reads its default configuration and templates from the checked-out working directory. In the confirmed finding, that action uses an unsandboxed Jinja2 environment to render attacker-controlled template content. This creates a Pwn Request chain in which an untrusted PR/comment path can reach template rendering in a privileged token context. This issue has been patched via commit 9c0f238.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-53942 since 06/11/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1221.

Applying the patch 9c0f23857282ff5cf7a6b3ad6bf0dd6f9974be55 is able to eliminate this problem.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• conda

Name

• infrastructure

Website

• Product: https://github.com/conda/infrastructure/

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Once again VulDB remains the best source for vulnerability data.

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