Detections
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Echo: js-yaml: security update to 3.15.2

high Tenable Self-Hosted Container Security Plugin ID 462321

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-84375)

Solution

Update the js-yaml library and its related packages to version 3.15.2 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-84375

Plugin Details

Severity: High

ID: 462321

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/5/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 5.7

Percentile: 96.05

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-84375

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 9/28/2026

Vulnerability Publication Date: 9/1/2026

Reference Information

CVE: CVE-2026-84375