{"items":[{"id":"NVI-00015084","kind":"vulnerability","title":"js-yaml: Exponential parsing time in flow collections leads to denial of service","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-pm4m-ph32-ghv5","CVE-2026-73643"],"plain_summary":"GitHub lists this reviewed advisory for js-yaml. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-5664d4f3d3922b03226d52d5cffc5914"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-08-13T17:47:37.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-1ce14eb24b3c7db0cbe783333d11cb34"},{"kind":"CVSS","as_of":"2026-10-24T15:10:00.190Z","value":"7.5 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-5664d4f3d3922b03226d52d5cffc5914"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-1ce14eb24b3c7db0cbe783333d11cb34","url":"https://github.com/advisories/GHSA-pm4m-ph32-ghv5","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-pm4m-ph32-ghv5","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T20:16:47.162Z"},{"id":"sr-5664d4f3d3922b03226d52d5cffc5914","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73643","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-73643","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-08T19:45:24.870Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1ce14eb24b3c7db0cbe783333d11cb34"],"technology":"js-yaml","known_exclusions":[],"conditions_summary":"### Summary\nParsing a small YAML document can take exponential time. An application that calls `load()` or `loadAll()` on untrusted input can be hung by a payload under 200 bytes.\n\n### Details\nWhen an entry in a flow sequence turns out to be a `key: value` pair, the parser rewinds and parses that entry a second time as the key.\nIf the key is itself a nested flow sequence of the same shape, every level is parsed twice, so the total work is O(2^n) in the nesting depth. The default `maxDepth` of 100 does not help, because the time is already unmanageable at about 30 to 40 levels.\n\nRoot cause, potentially the: `readFlowCollection` in parser.ts, the `restoreState` followed by a second `parseNode` further down.\n\n\n### PoC\n\n```javascript\nconst yaml = require('js-yaml')\nconst n = 30\nyaml.load('[ '.repeat(n) + '1' + ' ]: 0'.repeat(n))\n```\n\nWith default options: 22 levels takes about 1 second, 26 levels about 17 seconds, 30 levels over 2 minutes. The input stays under 200 bytes and grows linearly with `n`.\n\n### Impact\nDenial of service. A single small request can keep one CPU busy for minutes or longer and blocks the Node e","public_affected_ranges":[">= 5.0.0, <= 5.2.1"]}],"null_published_at":"2026-11-08T19:53:44.058Z","source_updated_at":"2026-08-13T17:47:37.000Z","source_disclosed_at":"2026-07-24T16:47:36.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-02T20:16:47.162Z"},{"id":"NVI-00015084","kind":"vulnerability","title":"js-yaml: Exponential parsing time in flow collections leads to denial of service","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-pm4m-ph32-ghv5","CVE-2026-73643"],"plain_summary":"GitHub lists this reviewed advisory for js-yaml. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-1ce14eb24b3c7db0cbe783333d11cb34"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-08-13T17:47:37.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-1ce14eb24b3c7db0cbe783333d11cb34"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-1ce14eb24b3c7db0cbe783333d11cb34","url":"https://github.com/advisories/GHSA-pm4m-ph32-ghv5","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-pm4m-ph32-ghv5","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T20:16:47.162Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1ce14eb24b3c7db0cbe783333d11cb34"],"technology":"js-yaml","known_exclusions":[],"conditions_summary":"### Summary\nParsing a small YAML document can take exponential time. An application that calls `load()` or `loadAll()` on untrusted input can be hung by a payload under 200 bytes.\n\n### Details\nWhen an entry in a flow sequence turns out to be a `key: value` pair, the parser rewinds and parses that entry a second time as the key.\nIf the key is itself a nested flow sequence of the same shape, every level is parsed twice, so the total work is O(2^n) in the nesting depth. The default `maxDepth` of 100 does not help, because the time is already unmanageable at about 30 to 40 levels.\n\nRoot cause, potentially the: `readFlowCollection` in parser.ts, the `restoreState` followed by a second `parseNode` further down.\n\n\n### PoC\n\n```javascript\nconst yaml = require('js-yaml')\nconst n = 30\nyaml.load('[ '.repeat(n) + '1' + ' ]: 0'.repeat(n))\n```\n\nWith default options: 22 levels takes about 1 second, 26 levels about 17 seconds, 30 levels over 2 minutes. The input stays under 200 bytes and grows linearly with `n`.\n\n### Impact\nDenial of service. A single small request can keep one CPU busy for minutes or longer and blocks the Node e","public_affected_ranges":[">= 5.0.0, <= 5.2.1"]}],"null_published_at":"2026-11-03T10:03:26.546Z","source_updated_at":"2026-08-13T17:47:37.000Z","source_disclosed_at":"2026-07-24T16:47:36.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-02T20:16:47.162Z"}],"next_cursor":null,"snapshot_revision":"42594"}