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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| TomWright | dasel | >= 3.0.0, < 3.3.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | dasel | No fix yet | — |
| Ubuntu 26.04 LTS | dasel | No fix yet | — |
| Ubuntu 25.10 | dasel | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | dasel | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 | openSUSE-SU-2026:21483-1 |
| openSUSE Leap 15.6 | govulncheck-vulndb | 0.0.20260326T203309-150000.1.155.2 | SUSE-SU-2026:1135-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | vale | 3.14.0-r2 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 3 repositories
-
GonSarrabia/Minimus-Junior-Backend-Exercise ★ 0 · Jun 2, 2026
Junior Backend Candidate Exercise: Packaging the dasel CLI (v3.3.1) with Melange, fixing CVE-2026-33320, and building a minimal container image using Apko.
-
rotavori/dasel-melange-apko ★ 0 · Jun 1, 2026
dasel v3.3.1 packaged with Melange and shipped as a minimal apko image, patched for CVE-2026-33320
-
nedlir/dasel-hardened-container ★ 0 · May 4, 2026
Hardened dasel v3.3.1 package and image built via Melange and apko. Patching CVE-2026-33320.
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/tomwright/dasel | all versions | — | GO-2026-4768 |
| Go | github.com/tomwright/dasel/v2 | all versions | — | GO-2026-4768 |
| Go | github.com/tomwright/dasel/v3 | >= 3.0.0, < 3.3.2 | 3.3.2 | GHSA-4fcp-jxh7-23x8 |
Advisories 2
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-SU-2026:1135-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Mar 31, 2026