Summaryinfo

A vulnerability was found in TomWright dasel up to 3.3.1. It has been declared as problematic. This affects an unknown part of the component Data Structure Handler. The manipulation of the argument yaml.Node.Alias results in recursion. This vulnerability is identified as CVE-2026-33320. The attack is only possible with local access. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in TomWright dasel up to 3.3.1. Affected is some unknown processing of the component Data Structure Handler. The manipulation of the argument yaml.Node.Alias with an unknown input leads to a recursion vulnerability. CWE is classifying the issue as CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. This is going to have an impact on availability. CVE summarizes:

Dasel is a command-line tool and library for querying, modifying, and transforming data structures. Starting in version 3.0.0 and prior to version 3.3.1, Dasel's YAML reader allows an attacker who can supply YAML for processing to trigger extreme CPU and memory consumption. The issue is in the library's own `UnmarshalYAML` implementation, which manually resolves alias nodes by recursively following `yaml.Node.Alias` pointers without any expansion budget, bypassing go-yaml v4's built-in alias expansion limit. Version 3.3.2 contains a patch for the issue.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-33320 since 03/18/2026. The exploitability is told to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 304088 (Linux Distros Unpatched Vulnerability : CVE-2026-33320), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.3.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (304088). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• TomWright

Name

• dasel

Version

• 3.3.0
• 3.3.1

Website

• Product: https://github.com/TomWright/dasel/

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