{"id":"CVE-2026-59868","title":"js-yaml is a JavaScript YAML parser and dumper","summary":"js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where e…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-407","CWE-770","CWE-1333"],"vendor":"nodeca","product":"js-yaml","affected":["js-yaml >= 5.0.0, < 5.2.0"],"patched":["js-yaml 5.2.0"],"published":"2026-07-08","updated":"2026-07-13","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-59868","references":[{"url":"https://github.com/nodeca/js-yaml/commit/3105455b81dee69e0fd36e09ac0b2ccfdb54adc1","label":"security-advisories@github.com"},{"url":"https://github.com/nodeca/js-yaml/releases/tag/5.2.0","label":"security-advisories@github.com"},{"url":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-g796-fgmg-93mv","label":"security-advisories@github.com"},{"url":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-g796-fgmg-93mv","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59868.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-59868"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2498114"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-59868"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59868"},{"url":"https://access.redhat.com/errata/RHSA-2026:61783"},{"url":"https://access.redhat.com/errata/RHSA-2026:34975"},{"url":"https://access.redhat.com/errata/RHSA-2026:26994"},{"url":"https://access.redhat.com/errata/RHSA-2026:9455"},{"url":"https://access.redhat.com/errata/RHSA-2026:35272"},{"url":"https://access.redhat.com/errata/RHSA-2026:34478"},{"url":"https://access.redhat.com/errata/RHSA-2026:7378"},{"url":"https://access.redhat.com/errata/RHSA-2026:33866"},{"url":"https://access.redhat.com/errata/RHSA-2026:7655"}],"tags":["nvd","csaf","vex","red-hat","score-dispute"],"epss":0.00644,"epssPercentile":0.5066,"ingestedAt":"2026-07-13T15:27:34.151Z","scores":{"nvd":5.3,"vendor":7.5},"slug":"CVE-2026-59868","body":"## Overview\n\njs-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in version 5.2.0.\n\n## Affected\n\n- `js-yaml >= 5.0.0, < 5.2.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `js-yaml 5.2.0`\n\n## Vendor advisories\n\n- **RHSA-2026:61783** · Red Hat · fixed in: Red Hat Discovery 2 · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61783)\n- **RHSA-2026:34975** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:34975)\n- **RHSA-2026:26994** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-06-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:26994)\n- **RHSA-2026:9455** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-04-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:9455)\n- **RHSA-2026:35272** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:35272)\n- **RHSA-2026:34478** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:34478)\n- **RHSA-2026:7378** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-04-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:7378)\n- **RHSA-2026:33866** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-06-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:33866)\n- **RHSA-2026:7655** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-04-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:7655)","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}