Process hang via unbounded YAML alias expansion
Published Mar 24, 2026 · Updated Mar 24, 2026
Uncontrolled recursion in Dasel 3.0.0 through 3.3.1 allows local users to hang its process by supplying alias-heavy YAML. Dasel's yamlValue.UnmarshalYAML handler recursively follows yaml.Node.Alias pointers without an expansion budget, bypassing go-yaml's guarded value-decoding path. Reachability requires YAML input to the CLI, library reader, or parse("yaml", ...) function; a 342-byte payload drove full CPU use and growing memory until termination.
Summary
What happened
Uncontrolled recursion in Dasel 3.0.0 through 3.3.1 allows local users to hang its process by supplying alias-heavy YAML. Dasel's yamlValue.UnmarshalYAML handler recursively follows yaml.Node.Alias pointers without an expansion budget, bypassing go-yaml's guarded value-decoding path. Reachability requires YAML input to the CLI, library reader, or parse("yaml", ...) function; a 342-byte payload drove full CPU use and growing memory until termination.
The record
- CVE
- CVE-2026-33320
- Published
- Mar 24, 2026
- Updated
- Mar 24, 2026
- Vendor
- Tom Wright
- Product
- Dasel
- Classifications
- CWE-674, T1499
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 24, 2026CVE publishedPublication date reported by the CVE source.
- Mar 24, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 3.0.0, < 3.3.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- GHSA-4fcp-jxh7-23x8 YAML alias proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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