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.

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21176-1 advisory.

    Changes in python-pytest-html:

    - Revendor updating shell-quote and js-yaml deps:
      - CVE-2026-13311: shell-quote: inefficient input parsing can lead to a         denial of service (bsc#1269361)
      - CVE-2026-53550: js-yaml: quadratic complexity when processing a         crafted YAML document can lead to CPU exhaustion (bsc#1268818)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-53550)

Note that Nessus relies on the presence of the package as reported by the vendor.

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

  - 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. (CVE-2026-53550)

ID	Name	Product	Family	Severity
324890	openSUSE 16 Security Update : python-pytest-html (openSUSE-SU-2026:21176-1)	Nessus	SuSE Local Security Checks	high
322241	Linux Distros Unpatched Vulnerability : CVE-2026-53550	Nessus	Misc.	medium
443206	SCA: security update for js-yaml (GHSA-h67p-54hq-rp68)	Tenable Cloud Security	SCA Checks	medium
443206	SCA: security update for js-yaml (GHSA-h67p-54hq-rp68)	Tenable Self-Hosted Container Security	SCA Checks	medium

Detections

Analytics

CVE-2026-53550

medium

Tenable Plugins

high

medium

medium

medium