UnratedFix available

DEBIAN-CVE-2026-33532

Type: advisorySource: OSV1 source record

`yaml` is a YAML parser and serialiser for JavaScript. Parsing a YAML document with a version of `yaml` on the 1.x branch prior to 1.10.3 or on the 2.x branch prior to 2.8.3 may throw a RangeError due to a stack overflow. The node resolution/composition phase uses recursive function calls without a depth bound. An attacker who can supply YAML for parsing can trigger a `RangeError: Maximum call stack size exceeded` with a small payload (~2–10 KB). The `RangeError` is not a `YAMLParseError`, so applications that only catch YAML-specific errors will encounter an unexpected exception type. Depending on the host application's exception handling, this can fail requests or terminate the Node.js process. Flow sequences allow deep nesting with minimal bytes (2 bytes per level: one `[` and one `]`). On the default Node.js stack, approximately 1,000–5,000 levels of nesting (2–10 KB input) exhaust the call stack. The exact threshold is environment-dependent (Node.js version, stack size, call stack depth at invocation). Note: the library's `Parser` (CST phase) uses a stack-based iterative approach and is not affected. Only the compose/resolve phase uses actual call-stack recursion. All three public parsing APIs are affected: `YAML.parse()`, `YAML.parseDocument()`, and `YAML.parseAllDocuments()`. Versions 1.10.3 and 2.8.3 contain a patch.

Announced 26 Mar 2026Source revision 1

Original source ↗

DEBIAN-CVE-2026-33532

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-33532

node-yaml

Source reference: /affected/0/package/name

Affected versions: 2.1.3-2
Source reference: /affected/0/versions
2.3.1-1
Source reference: /affected/0/versions
2.3.1-2
Source reference: /affected/0/versions
2.3.4+~cs0.4.0-1
Source reference: /affected/0/versions
2.3.4-1
Source reference: /affected/0/versions
2.8.2+~cs0.4.0-1
Source reference: /affected/0/versions
2.8.3+~cs0.4.0-1
Source reference: /affected/0/versions
2.8.3+~cs0.4.0-2
Source reference: /affected/0/versions
2.8.3+~cs0.4.0-3
Source reference: /affected/0/versions
2.9.0+~cs0.4.0-1
Source reference: /affected/0/versions
2.9.0+~cs0.4.0-2
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

node-yaml

Source reference: /affected/1/package/name

Affected versions: 2.3.4+~cs0.4.0-1
Source reference: /affected/1/versions
2.8.2+~cs0.4.0-1
Source reference: /affected/1/versions
2.8.3+~cs0.4.0-1
Source reference: /affected/1/versions
2.8.3+~cs0.4.0-2
Source reference: /affected/1/versions
2.8.3+~cs0.4.0-3
Source reference: /affected/1/versions
2.9.0+~cs0.4.0-1
Source reference: /affected/1/versions
2.9.0+~cs0.4.0-2
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

node-yaml

Source reference: /affected/2/package/name

Affected versions: 2.3.4+~cs0.4.0-1
Source reference: /affected/2/versions
2.8.2+~cs0.4.0-1
Source reference: /affected/2/versions
Fixed versions: 2.8.3+~cs0.4.0-1
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "node-yaml",
      "purl": "pkg:deb/debian/node-yaml?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "2.1.3-2",
      "2.3.1-1",
      "2.3.1-2",
      "2.3.4+~cs0.4.0-1",
      "2.3.4-1",
      "2.8.2+~cs0.4.0-1",
      "2.8.3+~cs0.4.0-1",
      "2.8.3+~cs0.4.0-2",
      "2.8.3+~cs0.4.0-3",
      "2.9.0+~cs0.4.0-1",
      "2.9.0+~cs0.4.0-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33532.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "node-yaml",
      "purl": "pkg:deb/debian/node-yaml?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "2.3.4+~cs0.4.0-1",
      "2.8.2+~cs0.4.0-1",
      "2.8.3+~cs0.4.0-1",
      "2.8.3+~cs0.4.0-2",
      "2.8.3+~cs0.4.0-3",
      "2.9.0+~cs0.4.0-1",
      "2.9.0+~cs0.4.0-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33532.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.8.3+~cs0.4.0-1"
          }
        ]
      }
    ],
    "package": {
      "name": "node-yaml",
      "purl": "pkg:deb/debian/node-yaml?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2.3.4+~cs0.4.0-1",
      "2.8.2+~cs0.4.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33532.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #56406 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 16:36:03 GMT
Publisher date: Thu, 26 Mar 2026 20:16:15 GMT

Read the original announcement