{"answers":{"affected":"2 open source packages ship an affected version, including js-yaml. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-59870 exists.","fix":"Upgrade js-yaml to 5.2.1 or later.","what":"CVE-2026-59870 is a high-severity denial of service vulnerability in nodeca js-yaml, published on 8 Jul 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-2026-59870 and fix it if it is affected.\n\nWhat it is: CVE-2026-59870 is a high-severity denial of service vulnerability in nodeca js-yaml, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-59870 exists.\n\nAffected packages and fixed versions:\n- js-yaml (npm): affected from 5.0.0; fixed in 5.2.1\n- js-yaml (npm): affected from 5.0.0; fixed in 5.2.1\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-2026-59870/ (Markdown: https://insights.sbomify.com/CVE-2026-59870/index.md)","id":"CVE-2026-59870","markdown":"https://insights.sbomify.com/CVE-2026-59870/index.md","name":"CVE-2026-59870","record":{"aliases":["CLSA-2026-1787592038","CLSA-2026-1790944389","CLSA-2026-1790950175","CLSA-2026-1792755810","GHSA-724g-mxrg-4qvm","UBUNTU-CVE-2026-59870"],"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 CPU exhaustion and denial of service by submitting crafted YAML documents with ordered maps to applications using the js-yaml library.","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":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"},{"id":"CWE-407","name":"Inefficient Algorithmic Complexity"}],"description":"js-yaml is a JavaScript YAML parser and dumper. Prior to 3.15.1, 4.3.1, and 5.2.1, YAML11_SCHEMA support for the !!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem() to perform a linear duplicate-key scan on every insertion, causing O(n^2) CPU consumption when yaml.load() parses a crafted ordered-map document. In v3 and v4, !!omap is active and exploitable by default. v5 doesn't use !!omap by default, and the chances of activating it are very low.This issue is fixed in 3.15.1, 4.3.1, and 5.2.1.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"js-yaml quadratic-complexity denial of service via YAML11_SCHEMA !!omap parsing","id":"CVE-2026-59870","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":2,"n_references":7,"next":{"headline":"node-tar: Process crash via PAX numeric path type confusion","id":"CVE-2026-59871"},"packages":[{"ecosystem":"npm","fixed":["5.2.1"],"introduced":["5.0.0"],"last_affected":[],"package":"js-yaml","purl":null,"source":"GHSA-724g-mxrg-4qvm"},{"ecosystem":"npm","fixed":["5.2.1"],"introduced":["5.0.0"],"last_affected":[],"package":"js-yaml","purl":"pkg:npm/js-yaml","source":"GHSA-724g-mxrg-4qvm"}],"prev":{"headline":"js-yaml: YAML merge-key chains can force quadratic CPU consumption","id":"CVE-2026-59869"},"products":["js-yaml"],"published":"2026-07-08","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":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: Quadratic-complexity DoS in merge key handling via repeated aliases","id":"CVE-2026-53550","kev_date_added":null,"published":"2026-06-22"},{"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":"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":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-06","vendors":["nodeca"]},"summary":"Attackers can cause CPU exhaustion and denial of service by submitting crafted YAML documents with ordered maps to applications using the js-yaml library.","url":"https://insights.sbomify.com/CVE-2026-59870/"}