{"answers":{"affected":"5 open source packages ship an affected version, including github.com/tomwright/dasel/v3, github.com/tomwright/dasel and github.com/tomwright/dasel/v2. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33320 exists.","fix":"Upgrade github.com/tomwright/dasel/v3 to 3.3.2 or later.","what":"CVE-2026-33320 is a medium-severity denial of service vulnerability in TomWright dasel, published on 24 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-33320 and fix it if it is affected.\n\nWhat it is: CVE-2026-33320 is a medium-severity denial of service vulnerability in TomWright dasel, published on 24 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33320 exists.\n\nAffected packages and fixed versions:\n- github.com/tomwright/dasel/v3 (Go): affected from 3.0.0; fixed in 3.3.2\n- github.com/tomwright/dasel/v3 (Go): affected from 3.0.0; fixed in 3.3.2\n- github.com/tomwright/dasel/v3 (Go): affected from 3.0.0; fixed in 3.3.2\n- github.com/tomwright/dasel (Go): affected all versions; no fix listed\n- github.com/tomwright/dasel/v2 (Go): affected all versions; no fix listed\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-33320/ (Markdown: https://insights.sbomify.com/CVE-2026-33320/index.md)","id":"CVE-2026-33320","markdown":"https://insights.sbomify.com/CVE-2026-33320/index.md","name":"CVE-2026-33320","record":{"aliases":["GHSA-4fcp-jxh7-23x8","GO-2026-4768","UBUNTU-CVE-2026-33320"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Go data transformation library","requires_auth":"none","summary":"An attacker can cause CPU and memory exhaustion in Dasel by supplying malicious YAML input, leading to a denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"dasel","vendor":"tomwright"}],"cvss":{"score":6.2,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-674","name":"Uncontrolled Recursion"}],"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.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":"2026-05-04","github_poc":3,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-05-04T16:34:52Z","kind":"github_poc","ref":"https://github.com/nedlir/dasel-hardened-container","stars":0,"title":"Hardened dasel v3.3.1 package and image built via Melange and apko. Patching CVE-2026-33320."},{"date":"2026-06-01T13:17:36Z","kind":"github_poc","ref":"https://github.com/rotavori/dasel-melange-apko","stars":0,"title":"dasel v3.3.1 packaged with Melange and shipped as a minimal apko image, patched for CVE-2026-33320"},{"date":"2026-06-02T11:09:13Z","kind":"github_poc","ref":"https://github.com/GonSarrabia/Minimus-Junior-Backend-Exercise","stars":0,"title":"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."}],"tier":"weaponised"},"has_fix":true,"headline":"Dasel has unbounded YAML alias expansion in dasel leads to CPU/memory denial of service","id":"CVE-2026-33320","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":5,"n_references":1,"next":{"headline":"OpenEMR has Out-of-Band Server-Side Request Forgery (OOB SSRF)","id":"CVE-2026-33321"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/tomwright/dasel","purl":"pkg:golang/github.com/tomwright/dasel","source":"GO-2026-4768"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/tomwright/dasel/v2","purl":"pkg:golang/github.com/tomwright/dasel/v2","source":"GO-2026-4768"},{"ecosystem":"Go","fixed":["3.3.2"],"introduced":["3.0.0"],"last_affected":[],"package":"github.com/tomwright/dasel/v3","purl":null,"source":"GHSA-4fcp-jxh7-23x8"},{"ecosystem":"Go","fixed":["3.3.2"],"introduced":["3.0.0"],"last_affected":[],"package":"github.com/tomwright/dasel/v3","purl":"pkg:golang/github.com/tomwright/dasel/v3","source":"GHSA-4fcp-jxh7-23x8"},{"ecosystem":"Go","fixed":["3.3.2"],"introduced":["3.0.0"],"last_affected":[],"package":"github.com/tomwright/dasel/v3","purl":"pkg:golang/github.com/tomwright/dasel/v3","source":"GO-2026-4768"}],"prev":{"headline":"AVideo Vulnerable to OS Command Injection via Unescaped URL in LinkedIn Video Upload Shell Command","id":"CVE-2026-33319"},"products":["dasel"],"published":"2026-03-24","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-26","vendors":["TomWright"]},"summary":"An attacker can cause CPU and memory exhaustion in Dasel by supplying malicious YAML input, leading to a denial of service.","url":"https://insights.sbomify.com/CVE-2026-33320/"}