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CVE-2026-33320— Dasel has unbounded YAML alias expansion in dasel leads to CPU/memory denial of service

Quick assessment

Affected
TomWright dasel
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Dasel是Tom Wright个人开发者的一个命令行数据查询与转换工具。 Dasel 3.0.0至3.3.1之前版本存在安全漏洞，该漏洞源于YAML读取器处理别名节点时未设置扩展限制，可能导致极端CPU和内存消耗。

CVSS 6.2 · Medium EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-33320

Vulnerability Information
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Vulnerability Title
Dasel has unbounded YAML alias expansion in dasel leads to CPU/memory denial of service
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
Dasel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Dasel是Tom Wright个人开发者的一个命令行数据查询与转换工具。 Dasel 3.0.0至3.3.1之前版本存在安全漏洞，该漏洞源于YAML读取器处理别名节点时未设置扩展限制，可能导致极端CPU和内存消耗。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TomWright dasel >= 3.0.0, < 3.3.2 -

II. Public POCs for CVE-2026-33320

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III. Intelligence Information for CVE-2026-33320

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Vendor Advisories for CVE-2026-33320 (1)

IV. Related Vulnerabilities

Same product: dasel
Same vendor: TomWright
Same weakness: CWE-674

V. Comments for CVE-2026-33320

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