CVE-2026-33320: medium-severity vulnerability in TomWright dasel
Dasel has unbounded YAML alias expansion in dasel leads to CPU/memory denial of service
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.2epss 0.2%
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.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
TomWright · daselRelated CVEs — TomWright dasel
In the same product, most dangerous first.
CVE-2026-62866MEDIUMDasel: Selector lexer panics on trailing whitespace in `parseCurRune`EPSS 0.2%CVE-2026-46377MEDIUMDasel: Index-out-of-range panic in dasel selector lexer on trailing backslash in quoted stringEPSS 0.2%CVE-2026-46378MEDIUMDasel: Denial of service in dasel selector lexer due to infinite loop on unterminated regex literalEPSS 0.2%CVE-2026-59168MEDIUMDasel: Unbounded recursion in JSON and XML readers causes unrecoverable stack-overflow DoSEPSS 0.1%