## YAML Parser Vulnerability CVE-2026-33532: Stack Overflow Risk in `yaml` v2.8.2
A critical security vulnerability has been disclosed in the widely-used `yaml` npm package, tracked as CVE-2026-33532. The flaw, a stack overflow, allows an attacker to crash a Node.js application by supplying a maliciously crafted YAML document. The issue resides in the node resolution and composition phase, which uses recursive function calls without a depth bound. This design flaw enables a denial-of-service attack with a relatively small payload of just 2–10 KB, triggering a `RangeError: Maximum call stack size exceeded` and halting the parsing process.

The vulnerability specifically affects version 2.8.2 of the `yaml` library, a core dependency for parsing and serializing YAML data in countless JavaScript and Node.js projects. The security advisory, published by the maintainer, confirms that parsing a document with the vulnerable version can cause the application to throw an uncaught exception. The fix is contained in the newly released version 2.8.3, which patches the recursive logic to prevent the stack overflow condition.

This update is marked as a security priority. The risk is significant for any service that accepts YAML input from untrusted sources, such as configuration files, CI/CD pipelines, or API payloads. While the immediate impact is application instability and potential downtime, the ease of exploitation makes it a high-priority patch. Developers and DevOps teams are urged to review their dependency trees and apply the `yaml@2.8.3` update immediately to mitigate this denial-of-service vector.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: cybersecurity, software vulnerability, npm, denial-of-service, CVE-2026-33532
- **Credibility**: unverified
- **Published**: 2026-04-01 11:27:17
- **ID**: 45234
- **URL**: https://whisperx.ai/en/intel/45234