{"answers":{"affected":"4 open source packages ship an affected version, including js-yaml. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-53550 in the wild and no public exploit code.","fix":"Upgrade js-yaml to a fixed version for your release line: 3.15.0 or 4.2.0.","what":"CVE-2026-53550 is a medium-severity denial of service vulnerability in nodeca js-yaml, published on 22 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-53550 and fix it if it is affected.\n\nWhat it is: CVE-2026-53550 is a medium-severity denial of service vulnerability in nodeca js-yaml, published on 22 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-53550 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- js-yaml (npm): affected all versions; fixed in 3.15.0\n- js-yaml (npm): affected all versions; fixed in 3.15.0\n- js-yaml (npm): affected from 4.0.0; fixed in 4.2.0\n- js-yaml (npm): affected from 4.0.0; fixed in 4.2.0\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-2026-53550/ (Markdown: https://insights.sbomify.com/CVE-2026-53550/index.md)","id":"CVE-2026-53550","markdown":"https://insights.sbomify.com/CVE-2026-53550/index.md","name":"CVE-2026-53550","record":{"aliases":["CLEANSTART-2026-EU49619","CLEANSTART-2026-RB45819","CLEANSTART-2026-ZI17820","CLEANSTART-2026-ZU44577","CLSA-2026-1790186133","CLSA-2026-1790944130","DEBIAN-CVE-2026-53550","ECHO-b33f-9f57-0682","GHSA-h67p-54hq-rp68","MINI-272r-8h37-wjj7","MINI-364m-8wpj-xm89","MINI-3jm7-p6c7-j6g5","MINI-59x5-v78r-qj94","MINI-62v8-6xcg-c248","MINI-752m-64qw-74c3","MINI-76ww-r3w5-fcjr","MINI-7gqw-5m4j-3q5f","MINI-7m7g-4vmf-jhmr","MINI-7qfg-7mpw-rf3v","MINI-888p-c7xg-5wx7","MINI-8qmv-8f9f-5w8v","MINI-98c9-5vmc-5w7x","MINI-9g35-c55q-6pp7","MINI-cwvj-h84q-fjv2","MINI-fr55-4vv5-vf3v","MINI-g668-4rfg-mc4h","MINI-gppc-q7x2-vvc9","MINI-gvw3-65xm-2q4v","MINI-j272-6fv2-732f","MINI-m4pr-jrc6-pwfg","MINI-mcgr-2qcc-rrw8","MINI-mqmr-vfmq-4p3j","MINI-pfxq-3xxc-fxv6","MINI-q3q6-wh6x-mgrv","MINI-q3wh-9pw7-xxhx","MINI-r58m-m9cx-c7hh","MINI-rpv5-4xpj-hqq9","MINI-v6cr-h2ch-jqrh","MINI-vm9f-pgmw-xgfg","MINI-vrfm-c2vm-jjw3","MINI-wvfh-f4p4-vr66","MINI-x3hq-j2f7-m3p5","MINI-x563-3c6v-qmf6","MINI-xxh2-jmrm-m45q","ROOT-APP-NPM-CVE-2026-53550","UBUNTU-CVE-2026-53550","openSUSE-SU-2026:11148-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript YAML parser","requires_auth":"none","summary":"Attackers can cause denial of service in applications using js-yaml by submitting crafted YAML documents that trigger quadratic CPU exhaustion during merge key processing.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"js-yaml","vendor":"nodeca"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-407","name":"Inefficient Algorithmic Complexity"}],"description":"js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0 and 3.15.0, a crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml merge-key processing (\u003c\u003c) by repeating the same alias many times in a merge sequence. This causes quadratic parse-time behavior relative to input size and can block a Node.js worker/event loop for seconds with a relatively small payload (tens of KB), resulting in denial of service. The issue is in merge handling inside lib/loader.js. This vulnerability is fixed in 4.2.0 and 3.15.0.","ecosystems":["npm","openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"js-yaml: Quadratic-complexity DoS in merge key handling via repeated aliases","id":"CVE-2026-53550","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":5,"n_references":1,"next":{"headline":"free5GC AUSF: null byte injection in supiOrSuci causes HTTP 500 internal service failure","id":"CVE-2026-53551"},"packages":[{"ecosystem":"npm","fixed":["3.15.0"],"introduced":["0"],"last_affected":[],"package":"js-yaml","purl":null,"source":"GHSA-h67p-54hq-rp68"},{"ecosystem":"npm","fixed":["3.15.0"],"introduced":["0"],"last_affected":[],"package":"js-yaml","purl":"pkg:npm/js-yaml","source":"GHSA-h67p-54hq-rp68"},{"ecosystem":"npm","fixed":["4.2.0"],"introduced":["4.0.0"],"last_affected":[],"package":"js-yaml","purl":null,"source":"GHSA-h67p-54hq-rp68"},{"ecosystem":"npm","fixed":["4.2.0"],"introduced":["4.0.0"],"last_affected":[],"package":"js-yaml","purl":"pkg:npm/js-yaml","source":"GHSA-h67p-54hq-rp68"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["0.19.0-1.1"],"introduced":["0"],"last_affected":[],"package":"python-pydata-sphinx-theme","purl":"pkg:rpm/opensuse/python-pydata-sphinx-theme\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:11148-1"}],"prev":{"headline":"Termix: Server-Side Request Forgery via Proxy Connectivity Test","id":"CVE-2026-53549"},"products":["js-yaml"],"published":"2026-06-22","related":[{"cvss_score":7.5,"headline":"js-yaml: YAML merge-key chains can force quadratic CPU consumption","id":"CVE-2026-59869","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":7.5,"headline":"js-yaml quadratic-complexity denial of service via YAML11_SCHEMA !!omap parsing","id":"CVE-2026-59870","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":6.8,"headline":"Deserialization Code Execution in js-yaml","id":"CVE-2013-4660","kev_date_added":null,"published":"2013-06-28"},{"cvss_score":5.3,"headline":"js-yaml: YAML merge-key chains can force quadratic CPU consumption","id":"CVE-2026-59868","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":5.3,"headline":"js-yaml has prototype pollution in merge (\u003c\u003c)","id":"CVE-2025-64718","kev_date_added":null,"published":"2025-11-13"}],"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":"SUSE","prefix":"openSUSE"},{"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)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-29","vendors":["nodeca"]},"summary":"Attackers can cause denial of service in applications using js-yaml by submitting crafted YAML documents that trigger quadratic CPU exhaustion during merge key processing.","url":"https://insights.sbomify.com/CVE-2026-53550/"}