CVE-2026-59869

Description

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.

References

https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m

https://github.com/nodeca/js-yaml/releases/tag/4.3.0

https://github.com/nodeca/js-yaml/releases/tag/3.15.0

https://github.com/nodeca/js-yaml/commit/59423c6f8cdc78742ac00e25a4dd39ef16b702e4

https://github.com/nodeca/js-yaml/commit/24f13e79ee1343a7e30bd6f6c9d9cdbf0ac9b2b7

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3