VDB
CVE-2026-84375
CVE-2026-84375
PUBLISHED
CVSS 7.5 HIGH
Reported by GitHub_M · Published September 1, 2026
js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 until 3.15.2 and 4.3.2, 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. This issue is fixed in versions 3.15.2 and 4.3.2.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| nodeca | js-yaml | >= 3.0.0, < 3.15.2, >= 4.0.0, < 4.3.2 |
| chainguard | eslint | 0 |
| wolfi | argo-workflows-4.0 | 0, 0, 0 |
| wolfi | opensearch-dashboards-3 | 0, 0, 0 |
| chainguard | renovate | 0 |
| wolfi | kubeflow-katib | 0, 0, 0 |
| chainguard | wazuh-dashboard | 0, 0 |
| chainguard | awx | 0, 0 |
| chainguard | code-server | 0, 0 |
| wolfi | lerna | 0, 0, 0 |
| chainguard | ts-patch | 0, 0 |
| chainguard | kubeflow-katib | 0 |
| chainguard | lerna | 0, 0 |
| chainguard | mongod-8.0 | 0 |
| chainguard | authentik-fips-2026.5 | 0, 0 |
| chainguard | gitlab-rails-ce-fips-19.1 | 0, 0 |
| chainguard | redisinsight | 0, 0 |
| wolfi | prism | 0, 0, 0 |
| chainguard | mongod-8.3 | 0, 0 |
| wolfi | renovate | 0, 0, 0 |
…and 29 more
Timeline
- Sep 1, 2026 CVE Published
- Sep 2, 2026 EPSS Score
- Sep 2, 2026 Coalition ESS Score
- Sep 2, 2026 CVE Updated
- Sep 6, 2026 EPSS Score
- Sep 9, 2026 EPSS Score
- Sep 9, 2026 Security Advisory
- Sep 12, 2026 EPSS Score
- Sep 16, 2026 EPSS Score
- Sep 18, 2026 EPSS Score
References
- https://github.com/nodeca/js-yaml/security/advisories/GHSA-2883-xcg3-v3hh x_refsource_CONFIRM
- https://github.com/nodeca/js-yaml/pull/797 x_refsource_MISC
- https://github.com/nodeca/js-yaml/commit/3485bc06ff8a0251505f44a00414d90df2466639 x_refsource_MISC
- https://github.com/nodeca/js-yaml/commit/6a8e05f9a485188ed730ac81e81ae221352ef480 x_refsource_MISC
- https://github.com/nodeca/js-yaml/commit/d90b6612a5a84385bdcb556c44578eac76dc0f6b x_refsource_MISC
- https://github.com/nodeca/js-yaml/releases/tag/3.15.2 x_refsource_MISC
- https://github.com/nodeca/js-yaml/releases/tag/4.3.2 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-84375 advisory
- https://github.com/advisories/GHSA-2883-xcg3-v3hh advisory