Mako is a template library written in Python. Prior to 1.4.2, on Windows, TemplateLookup.get_template() in mako/lookup.py resolves template URIs with posixpath, while Template.__init__() in mako/template.py validates them with os.path, which uses ntpath. A URI beginning with a drive designator causes ntpath to absorb the traversal segments before the leading dot-dot check, while posixpath resolution can escape the configured template directory. An application that passes attacker-controlled template names or include paths can disclose process-readable files on the same volume, and a targeted file containing Mako template syntax may also be parsed and executed as a template. Raw URL paths are generally normalized before reaching this form, but query strings, form or JSON bodies, route parameters, and dynamic include expressions can preserve it. This issue is fixed in version 1.4.2.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Mako is a template library written in Python. Prior to 1.4.2, on Windows, TemplateLookup.get_template() in
    mako/lookup.py resolves template URIs with posixpath, while Template.__init__() in mako/template.py
    validates them with os.path, which uses ntpath. A URI beginning with a drive designator causes ntpath to
    absorb the traversal segments before the leading dot-dot check, while posixpath resolution can escape the
    configured template directory. An application that passes attacker-controlled template names or include
    paths can disclose process-readable files on the same volume, and a targeted file containing Mako template
    syntax may also be parsed and executed as a template. Raw URL paths are generally normalized before
    reaching this form, but query strings, form or JSON bodies, route parameters, and dynamic include
    expressions can preserve it. This issue is fixed in version 1.4.2. (CVE-2026-102991)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Mako is a template library written in Python. Prior to 1.4.2, on Windows, TemplateLookup.get_template() in     mako/lookup.py resolves template URIs with posixpath, while Template.__init__() in mako/template.py     validates them with os.path, which uses ntpath. A URI beginning with a drive designator causes ntpath to     absorb the traversal segments before the leading dot-dot check, while posixpath resolution can escape the     configured template directory. An application that passes attacker-controlled template names or include     paths can disclose process-readable files on the same volume, and a targeted file containing Mako template     syntax may also be parsed and executed as a template. Raw URL paths are generally normalized before     reaching this form, but query strings, form or JSON bodies, route parameters, and dynamic include     expressions can preserve it. This issue is fixed in version 1.4.2. (CVE-2026-102991)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
473559	Echo: mako: security update to 1.4.2	Tenable Cloud Security	Echo Local Security Checks	Local	medium
473559	Echo: mako: security update to 1.4.2	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
473003	SCA: security update for Mako (GHSA-5639-2j2p-m4mx)	Tenable Cloud Security	SCA Checks	Local	medium
473003	SCA: security update for Mako (GHSA-5639-2j2p-m4mx)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium
362750	Linux Distros Unpatched Vulnerability : CVE-2026-102991	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-102991

medium

Tenable Plugins

medium

medium

medium

medium

medium