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CVE-2026-33532

yaml: yaml: Denial of Service via deeply nested YAML document parsing

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Severity

Moderate

Red Hat Product Security

6.5

CVSS 3.1

Review impact separately from score.

Published · March 27, 2026

Updated · October 27, 2026

Description

A flaw was found in yaml, a YAML parser and serializer for JavaScript. An attacker who can supply a specially crafted, deeply nested YAML document for parsing can trigger a RangeError due to a stack overflow. This can lead to a Denial of Service (DoS) by exhausting the call stack, potentially causing the application to fail requests or terminate the Node.js process.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

CVSS / CWE

CVSS 3.1 · 6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-606 · Unchecked Input for Loop Condition