node-js-yaml: js-yaml is a JavaScript YAML parser and dumper
CVE-2026-53550 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-53550, released June 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.
js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0 and 3.15.0, a crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml merge-key processing (<<) by repeating the same alias many times in a merge sequence. This causes quadratic parse-time behavior relative to input size and can block a Node.js worker/event loop for seconds with a relatively small payload (tens of KB), resulting in denial of service. The issue is in merge handling inside lib/loader.js. This vulnerability is fixed in 4.2.0 and 3.15.0.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| agama-web-ui · opensuse-leap 16.0 | 17+673.b97ba64d6-160000.12.1 | OPENSUSE-SU-2026:21448-1 | Jul 27, 2026 |
| node-js-yaml · Debian 14 | 4.2.0+~4.0.9-1 | DEBIAN-CVE-2026-53550 | Jun 27, 2026 |
| python-pytest-html · opensuse-leap 16.0 | 4.1.1-bp160.3.1 | OPENSUSE-SU-2026:21176-1 | Jun 30, 2026 |
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