# js-yaml (npm) vulnerabilities

Source: https://junglewise.ai/threats/technologies/js-yaml  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/js-yaml.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 12 vulnerabilities in js-yaml (npm): 0 in the last 7 days and 2 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, js-yaml CPU exhaustion via merge keys with empty mappings, was published on 29 September 2026. Nothing in the last four weeks, down from 1 vulnerability in the four before.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 2
- All time: 12 (0 critical, 0 exploited in the wild)

## About js-yaml (npm)

JavaScript library for parsing and serializing YAML data.

## Latest js-yaml (npm) vulnerabilities

- [js-yaml CPU exhaustion via merge keys with empty mappings](https://junglewise.ai/threats/js-yaml-maxtotalmergekeys-does-not-limit-cpu-use-for-empty-merge-e18172a3) (medium, CVSS 5.3, published 29 Sep 2026)
- [CVE-2026-84375: js-yaml YAML merge CPU consumption DoS](https://junglewise.ai/threats/cve-2026-84375-js-yaml-denial-of-service-via-empty-merge-sources) (high, CVSS 7.5, published 1 Sep 2026)
- [CVE-2026-73643: js-yaml exponential parsing time in flow collections denial of service](https://junglewise.ai/threats/cve-2026-73643-js-yaml-exponential-parsing-time-in-flow-collections-denial-of) (high, CVSS 7.5, published 13 Aug 2026)
- [JS-YAML quadratic CPU consumption in !!omap resolution](https://junglewise.ai/threats/js-yaml-quadratic-cpu-consumption-in-omap-resolution-f21ac1bd) (low, CVSS 3.1, published 6 Aug 2026)
- [CVE-2026-59870: nodeca js-yaml denial of service in YAML11_SCHEMA omap parsing](https://junglewise.ai/threats/cve-2026-59870-nodeca-js-yaml-denial-of-service-in-yaml11-schema-omap-parsing) (medium, CVSS 5.3, published 8 Jul 2026)
- [CVE-2026-59869: nodeca js-yaml denial of service via merge key chains](https://junglewise.ai/threats/cve-2026-59869-nodeca-js-yaml-denial-of-service-via-merge-key-chains) (high, CVSS 7.5, published 8 Jul 2026)
- [CVE-2026-59868: js-yaml denial of service via quadratic CPU consumption in merge keys](https://junglewise.ai/threats/cve-2026-59868-js-yaml-denial-of-service-via-quadratic-cpu-consumption-in-merge) (medium, CVSS 5.3, published 8 Jul 2026)
- [CVE-2026-53550: nodeca js-yaml denial of service in merge key handling](https://junglewise.ai/threats/cve-2026-53550-nodeca-js-yaml-denial-of-service-in-merge-key-handling) (medium, CVSS 5.3, published 22 Jun 2026)
- [CVE-2025-64718: js-yaml prototype pollution in merge operator](https://junglewise.ai/threats/cve-2025-64718-js-yaml-prototype-pollution-in-merge-operator) (medium, CVSS 5.3, published 13 Nov 2025)
- [nodeca js-yaml Denial of Service via complex map keys](https://junglewise.ai/threats/nodeca-js-yaml-denial-of-service-via-complex-map-keys-ebc6e7f3) (low, CVSS 3.1, published 5 Jun 2019)
- [js-yaml code injection in load() function](https://junglewise.ai/threats/js-yaml-code-injection-in-load-function-f33c238d) (info, CVSS 7.5, published 4 Jun 2019)
- [CVE-2013-4660: js-yaml deserialization code execution](https://junglewise.ai/threats/cve-2013-4660-js-yaml-deserialization-code-execution) (info, published 24 Oct 2017)

## Most severe js-yaml (npm) vulnerabilities

- [CVE-2026-59869: nodeca js-yaml denial of service via merge key chains](https://junglewise.ai/threats/cve-2026-59869-nodeca-js-yaml-denial-of-service-via-merge-key-chains) (high, CVSS 7.5, published 8 Jul 2026)
- [CVE-2026-84375: js-yaml YAML merge CPU consumption DoS](https://junglewise.ai/threats/cve-2026-84375-js-yaml-denial-of-service-via-empty-merge-sources) (high, CVSS 7.5, published 1 Sep 2026)
- [CVE-2026-73643: js-yaml exponential parsing time in flow collections denial of service](https://junglewise.ai/threats/cve-2026-73643-js-yaml-exponential-parsing-time-in-flow-collections-denial-of) (high, CVSS 7.5, published 13 Aug 2026)
- [CVE-2026-59870: nodeca js-yaml denial of service in YAML11_SCHEMA omap parsing](https://junglewise.ai/threats/cve-2026-59870-nodeca-js-yaml-denial-of-service-in-yaml11-schema-omap-parsing) (medium, CVSS 5.3, published 8 Jul 2026)
- [CVE-2026-59868: js-yaml denial of service via quadratic CPU consumption in merge keys](https://junglewise.ai/threats/cve-2026-59868-js-yaml-denial-of-service-via-quadratic-cpu-consumption-in-merge) (medium, CVSS 5.3, published 8 Jul 2026)
- [CVE-2026-53550: nodeca js-yaml denial of service in merge key handling](https://junglewise.ai/threats/cve-2026-53550-nodeca-js-yaml-denial-of-service-in-merge-key-handling) (medium, CVSS 5.3, published 22 Jun 2026)
- [CVE-2025-64718: js-yaml prototype pollution in merge operator](https://junglewise.ai/threats/cve-2025-64718-js-yaml-prototype-pollution-in-merge-operator) (medium, CVSS 5.3, published 13 Nov 2025)
- [js-yaml CPU exhaustion via merge keys with empty mappings](https://junglewise.ai/threats/js-yaml-maxtotalmergekeys-does-not-limit-cpu-use-for-empty-merge-e18172a3) (medium, CVSS 5.3, published 29 Sep 2026)
- [JS-YAML quadratic CPU consumption in !!omap resolution](https://junglewise.ai/threats/js-yaml-quadratic-cpu-consumption-in-omap-resolution-f21ac1bd) (low, CVSS 3.1, published 6 Aug 2026)
- [nodeca js-yaml Denial of Service via complex map keys](https://junglewise.ai/threats/nodeca-js-yaml-denial-of-service-via-complex-map-keys-ebc6e7f3) (low, CVSS 3.1, published 5 Jun 2019)

## Vulnerabilities per week

Nothing in the last four weeks, down from 1 vulnerability in the four before.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 1 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 1 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other npm technologies

- [openclaw (npm)](https://junglewise.ai/threats/technologies/npm-openclaw): 214 vulnerabilities
- [flowise (npm)](https://junglewise.ai/threats/technologies/flowise): 133 vulnerabilities
- [parse-server (npm)](https://junglewise.ai/threats/technologies/parse-server): 117 vulnerabilities
- [vm2 (npm)](https://junglewise.ai/threats/technologies/vm2): 111 vulnerabilities
- [electron (npm)](https://junglewise.ai/threats/technologies/electron): 77 vulnerabilities
- [ghost (npm)](https://junglewise.ai/threats/technologies/ghost): 74 vulnerabilities
- [n8n (npm)](https://junglewise.ai/threats/technologies/npm-n8n): 64 vulnerabilities
- [hono (npm)](https://junglewise.ai/threats/technologies/hono): 62 vulnerabilities
- [directus (npm)](https://junglewise.ai/threats/technologies/directus): 61 vulnerabilities
- [nocodb (npm)](https://junglewise.ai/threats/technologies/nocodb): 54 vulnerabilities
- [undici (npm)](https://junglewise.ai/threats/technologies/undici): 53 vulnerabilities
- [@budibase/server (npm)](https://junglewise.ai/threats/technologies/budibase-server): 42 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "js-yaml (npm) vulnerabilities", https://junglewise.ai/threats/technologies/js-yaml, 13 November 2026.