Resource Exhaustion Affecting unleash-proxy package, versions <1.4.19-r10


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.54% (44th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-UNLEASHPROXY-19884806
  • published17 Sept 2026
  • disclosed1 Sept 2026

Introduced: 1 Sep 2026

CVE-2026-84375  (opens in a new tab)
CWE-400  (opens in a new tab)
CWE-407  (opens in a new tab)

How to fix?

Upgrade Chainguard unleash-proxy to version 1.4.19-r10 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream unleash-proxy package and not the unleash-proxy package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1