CVE-2026-33320
CVE-2026-33320 is a medium-severity vulnerability in Tomwright Dasel with a CVSS 3.x base score of 6.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-674.
Key facts
- Severity: Medium (CVSS 3.x base score 6.2)
- EPSS exploit prediction: 0% (11th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-20094
- Weakness: CWE-674
- Affected product: Tomwright Dasel
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-33320?
- 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.
- How severe is CVE-2026-33320?
- CVE-2026-33320 has a CVSS 3.x base score of 6.2, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2026-33320 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-33320?
- CVE-2026-33320 affects Tomwright Dasel. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-33320?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-33320 have an EU (EUVD) identifier?
- Yes. CVE-2026-33320 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20094.
- When was CVE-2026-33320 published?
- CVE-2026-33320 was published on 2026-03-24 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:tomwright:dasel:*:*:*:*:*:go:*:*
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