6.2

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

Analyzed
AliasesUBUNTU-CVE-2026-33320CGA-88xj-97w5-pr5xCGA-xxqf-rp4r-rc68
Published 24-03-2026Last modified 26-03-2026

Vulnerability summary

CVE-2026-33320 is a medium (CVSS 6.2) Uncontrolled Recursion vulnerability in tomwright dasel. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 12.4% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 6.2, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.2/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.22%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:21483-1SUSE-SU-2026:1135-1

Timeline

  1. 24-03-2026
    PublishedVulnerability first disclosed.
  2. 26-03-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

Increase +0.05 pp

From 0.17% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Dasel

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Github.com/tomwright/dasel2 products
  • v2All versions (No fix recorded)
  • v3≥ 3.0.0, < 3.3.2
Chainguard1 product
  • vale< 3.14.0-r2
Github.com/tomwright1 product
  • daselAll versions (No fix recorded)
Tomwright1 product
Ubuntu1 product
  • daselAll versions (No fix recorded)
Wolfi1 product
  • vale< 3.14.0-r2

6 vendors · 7 products

References

7 links