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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: node-js-yaml: CVE-2026-84375
Message-ID: <178849287529.783010.12891556959884267603.reportbug@eldamar.lan>
X-Mailer: reportbug 13.2.0+nmu1
Date: Fri, 04 Sep 2026 05:34:35 +0200
Delivered-To: submit@bugs.debian.org

Source: node-js-yaml
Version: 4.2.0+~4.0.9-2
Severity: important
Tags: security upstream
Forwarded: https://github.com/nodeca/js-yaml/pull/797
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for node-js-yaml.

CVE-2026-84375[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-84375
    https://www.cve.org/CVERecord?id=CVE-2026-84375
[1] https://github.com/nodeca/js-yaml/pull/797
[2] https://github.com/nodeca/js-yaml/security/advisories/GHSA-2883-xcg3-v3hh

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore
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