CVE-2026-33320

Description

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.

References

https://github.com/Omer-Asher/dasel-cve-exercise

https://github.com/Neverland-lcl/Security_OS_CVE

https://github.com/Neverland-lcl/Security_OS

https://github.com/GonSarrabia/Minimus-Junior-Backend-Exercise

https://github.com/rotavori/dasel-melange-apko

https://github.com/SharonHen1703/dasel-cve-fix

https://github.com/nedlir/dasel-hardened-container

https://github.com/TomWright/dasel/security/advisories/GHSA-4fcp-jxh7-23x8

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-20094

Details

Source: Mitre, NVD

Named Vulnerability: GO-2026-4768Named Vulnerability: GHSA-4fcp-jxh7-23x8

Risk Information

CVSS v2

CVSS v3

EPSS