TomWright dasel up to 3.11.1 Lexer tokenize.go parseCurRune out-of-bounds

Summaryinfo

A vulnerability was found in TomWright dasel up to 3.11.1. It has been rated as problematic. Affected by this vulnerability is the function parseCurRune of the file selector/lexer/tokenize.go of the component Lexer. Performing a manipulation results in out-of-bounds. This vulnerability is reported as CVE-2026-62866. The attack requires a local approach. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in TomWright dasel up to 3.11.1. This affects the function parseCurRune of the file selector/lexer/tokenize.go of the component Lexer. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on availability. The summary by CVE is:

Dasel is a command-line tool and library for querying, modifying, and transforming data structures. From 3.0.0 until 3.11.2, selector/lexer/tokenize.go parseCurRune advances the input index across trailing whitespace and then reads the source at the exhausted index without an end-of-input check. A selector ending in whitespace, including input passed through lexer.NewTokenizer(...).Tokenize() or dasel.Query, can therefore cause an index-out-of-range panic and terminate the process. This issue is fixed in version 3.11.2.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-62866 since 07/14/2026. The exploitability is told to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 349595 (Linux Distros Unpatched Vulnerability : CVE-2026-62866), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.11.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (349595). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• TomWright

Name

• dasel

Version

• 3.11.0
• 3.11.1

Website

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

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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