CVE-2026-33320: Dasel is a command-line tool and library for querying, modifying, and transforming data structures

Routine

MEDIUM 6.2UPGRADE

CVE-2026-33320 is a medium-severity flaw (CVSS 6.2) affecting dasel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.2 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-674
Published	2026-03-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: tomwright

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-24 01:17 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

tomwright dasel UPGRADE

Affected: >= 3.0.0 and < 3.3.2

Fixed in: 3.3.2

Safe to downgrade to: a release before 3.0.0

1. Check installed version

apt-cache policy dasel || rpm -q dasel || dasel --version

2. UPGRADE to 3.3.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade dasel

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade dasel

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison dasel sudo apt install dasel=<VERSION_BEFORE_3.0.0> sudo apt-mark hold dasel

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list dasel sudo dnf downgrade dasel-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add dasel

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33320?

dasel: upgrade to 3.3.2. Exact commands for each OS are on this page.

Is CVE-2026-33320 being exploited?

CVE-2026-33320 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33320 affect?

CVE-2026-33320 affects dasel. Severity is medium (CVSS 6.2). 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 e

How urgent is CVE-2026-33320?

Priority 30/100. Public exploit reference

References

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