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CVE-2026-59869

js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, 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 versions 3.15.0 and 4.3.0.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6ff08703385e1407347aa412bcb3fe3f9484e3e4aac7e19c2475144b94f8575d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"js-yaml","vendor":"nodeca","versions":[{"status":"affected","version":">= 3.0.0, < 3.15.0"},{"status":"affected","version":">= 4.0.0, < 4.3.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e26435f42659d74c0be691811e4acf2add6297c38d48498b15c2fb706743f469 · sha256:767d6809867ada4b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e26435f42659d74c0be691811e4acf2add6297c38d48498b15c2fb706743f469 · sha256:767d6809867ada4b… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-407","description":"CWE-407: Inefficient Algorithmic Complexity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e26435f42659d74c0be691811e4acf2add6297c38d48498b15c2fb706743f469 · sha256:767d6809867ada4b… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"name":"https://github.com/nodeca/js-yaml/commit/24f13e79ee1343a7e30bd6f6c9d9cdbf0ac9b2b7","tags":["x_refsource_MISC"],"url":"https://github.com/nodeca/js-yaml/commit/24f13e79ee1343a7e30bd6f6c9d9cdbf0ac9b2b7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e26435f42659d74c0be691811e4acf2add6297c38d48498b15c2fb706743f469 · sha256:767d6809867ada4b… · /containers/cna/references/1
{"name":"https://github.com/nodeca/js-yaml/commit/59423c6f8cdc78742ac00e25a4dd39ef16b702e4","tags":["x_refsource_MISC"],"url":"https://github.com/nodeca/js-yaml/commit/59423c6f8cdc78742ac00e25a4dd39ef16b702e4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e26435f42659d74c0be691811e4acf2add6297c38d48498b15c2fb706743f469 · sha256:767d6809867ada4b… · /containers/cna/references/2
{"name":"https://github.com/nodeca/js-yaml/releases/tag/3.15.0","tags":["x_refsource_MISC"],"url":"https://github.com/nodeca/js-yaml/releases/tag/3.15.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e26435f42659d74c0be691811e4acf2add6297c38d48498b15c2fb706743f469 · sha256:767d6809867ada4b… · /containers/cna/references/3
{"name":"https://github.com/nodeca/js-yaml/releases/tag/4.3.0","tags":["x_refsource_MISC"],"url":"https://github.com/nodeca/js-yaml/releases/tag/4.3.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e26435f42659d74c0be691811e4acf2add6297c38d48498b15c2fb706743f469 · sha256:767d6809867ada4b… · /containers/cna/references/4
{"name":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e26435f42659d74c0be691811e4acf2add6297c38d48498b15c2fb706743f469 · sha256:767d6809867ada4b… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e26435f42659d74c0be691811e4acf2add6297c38d48498b15c2fb706743f469 · sha256:767d6809867ada4b… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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