CVE-2026-33320

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{"affected": [{"affectedData": [{"product": "dasel", "vendor": "TomWright", "versions": [{"status": "affected", "version": ">= 3.0.0, < 3.3.2"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:tomwright:dasel:*:*:*:*:*:go:*:*", "matchCriteriaId": "E08D6137-BA75-4A33-9DAF-F28A5FCEF5DC", "versionEndExcluding": "3.3.2", "versionStartIncluding": "3.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Dasel es una herramienta de l\u00ednea de comandos y biblioteca para consultar, modificar y transformar estructuras de datos. A partir de la versi\u00f3n 3.0.0 y antes de la versi\u00f3n 3.3.1, el lector YAML de Dasel permite a un atacante que puede proporcionar YAML para su procesamiento desencadenar un consumo extremo de CPU y memoria. El problema reside en la propia implementaci\u00f3n `UnmarshalYAML` de la biblioteca, que resuelve manualmente los nodos alias siguiendo recursivamente los punteros `yaml.Node.Alias` sin ning\u00fan presupuesto de expansi\u00f3n, eludiendo el l\u00edmite de expansi\u00f3n de alias incorporado de go-yaml v4. La versi\u00f3n 3.3.2 contiene un parche para el problema."}], "id": "CVE-2026-33320", "lastModified": "2026-06-17T10:37:19.127", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33320", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-26T12:24:19.541190Z", "version": "2.0.3"}}]}, "published": "2026-03-24T01:17:02.203", "references": [{"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/TomWright/dasel/security/advisories/GHSA-4fcp-jxh7-23x8"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-674"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.0.0,3.3.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "dasel", "source": "cna", "vendor": "TomWright"}, "product": "dasel", "vendor": "tomwright"}], "analysis": {"en": {"generated_at": "2026-03-25T19:40:38.288978+00:00", "value": {"mitigation_remediation": ["Upgrade tomwright/dasel to version 3.3.2 or later", "Verify that the installed binary matches the patched version", "If the tool is used within an application, ensure it cannot receive untrusted YAML from external inputs", "Monitor resource usage for signs of denial\u2011of\u2011service attacks"], "summary": {"action": "Apply Patch", "impact": "Denial of Service via unlimited YAML alias expansion"}, "threat_synthesis": {"affected_systems": "TomWright's dasel, versions 3.0.0 through 3.3.1, is affected. Version 3.3.2 fixes the issue.", "description_and_impact": "Dasel's YAML reader can fully expand aliases without any limit, causing extreme CPU and memory usage when parsing malicious YAML. This leads to a denial\u2011of\u2011service condition for the process handling the input. The flaw is a classic uncontrolled recursion weakness (CWE\u2011674). The impact is that an attacker who can supply YAML data to dasel\u2014whether by feeding a file to the command\u2011line tool or by invoking the library in an application\u2014can exhaust host resources and make the process unresponsive.", "risk_and_exploitability": "The CVSS score of 6.2 indicates moderate severity. The EPSS score of less than 1% signals a low likelihood of exploitation in the wild, and the vulnerability is not listed in CISA's KEV catalog. Attackers would need to supply crafted YAML to dasel; the vulnerability is local unless an application incorporating dasel processes untrusted data from a remote source. No public exploit is documented. Patch or mitigate the unbounded expansion to eliminate the risk."}}}}, "created": "2026-03-24T10:29:39.031594+00:00", "updated": "2026-03-25T20:40:45.106744+00:00", "vendors": ["tomwright", "tomwright$PRODUCT$dasel"]}