node-js-yaml: js-yaml is a JavaScript YAML parser and dumper
CVE-2026-84375 is fixed in node-js-yaml on 1 platform by DEBIAN-CVE-2026-84375 (version 4.3.2+~4.0.9-1), released September 10, 2026. It is not reported as exploited. Patch Radar priority: High.
js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 until 3.15.2, 4.3.2, and 5.4.1, maxTotalMergeKeys in lib/js-yaml/loader.js and lib/loader.js does not count empty mapping sources while processing the merge key <<. An attacker can alias a large sequence of empty mappings into many merge targets, causing O(N * K) processing while totalMergeKeys remains unchanged and the configured resource limit is never reached. A relatively small YAML document can therefore cause prolonged CPU consumption in applications that parse untrusted YAML, and merge processing is enabled by default on these release lines. In v3 & v4, merge is enabled by default so the severity score is higher. This issue is fixed in versions 3.15.2, 4.3.2, and 5.4.1.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| node-js-yaml · Debian 14 | 4.3.2+~4.0.9-1 | DEBIAN-CVE-2026-84375 | Sep 10, 2026 |
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