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TI-2026-25731 Aliases CVE-2026-33320GHSA-4fcp-jxh7-23x8

Dasel has unbounded YAML alias expansion in dasel leads to CPU/memory denial of service

Priority MEDIUM 61CWE-674Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-674.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00219 12th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed dasel (TomWright): 3.3.2github.com/tomwright/dasel/v3 (Go): 3.3.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TomWrightdasel3.0.0 to before 3.3.23.3.2Patch availableCNA
—github.com/tomwright/dasel/v3 (Go)3.0.0 to before 3.3.23.3.2Patch availableGHSA-4fcp-jxh7-23x8
  • dasel VendorTomWright Affected 3.0.0 to before 3.3.2 Fixed in 3.3.2 Patch available CNA
  • github.com/tomwright/dasel/v3 (Go) Vendor— Affected 3.0.0 to before 3.3.2 Fixed in 3.3.2 Patch available GHSA-4fcp-jxh7-23x8

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:tomwright:dasel:*:*:*:*:*:go:*:*3.0.0 to before 3.3.2VulnerableTomWright
  • cpe:2.3:a:tomwright:dasel:*:*:*:*:*:go:*:* Versions 3.0.0 to before 3.3.2 Vulnerable ·TomWright

Remediation

  • Fix · CNA dasel (TomWright) Fixed in 3.3.2
  • Fix · GHSA-4fcp-jxh7-23x8 github.com/tomwright/dasel/v3 (Go) Fixed in 3.3.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33320
  2. 2026-10-03 Alias added: GHSA-4fcp-jxh7-23x8

References

Exploit 1

Advisory 1

Other 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences