Security readout for executives and security teams
Plain-English summary
CVE-2018-1000210 affects YamlDotNet 4.3.2 and earlier. If an application parses a specially crafted YAML file, the default deserializer can instantiate attacker-selected types, potentially causing code execution inside the application process.
Executive priority
Prioritize remediation where YAML is accepted from users or external systems. The business risk is process-level code execution, but urgency depends on whether untrusted YAML reaches vulnerable parsing code.
Technical view
The reported issue is in default Deserializer.Deserialize() behavior. A YAML tag is used to resolve a type through Type.GetType(nodeEvent.Tag.Substring(1), throwOnError: false), then instantiated without adequate restriction. The CVE states this was fixed in YamlDotNet 5.0.0.
Likely exposure
Exposure is likely limited to applications that use YamlDotNet 4.3.2 or earlier and parse YAML content controlled by users, partners, uploads, integrations, or other external inputs.
Exploitation context
The source bundle says exploitation requires the victim to parse a specially crafted YAML file. CISA KEV is false, and the provided sources do not show active exploitation.
Researcher notes
The evidence is sparse: no CVSS, CWE, exploit reference, or detailed remediation guidance beyond the 5.0.0 fix statement. Validate reachability before rating local risk.
Mitigation direction
- Upgrade YamlDotNet to version 5.0.0 or later.
- Remove or replace YamlDotNet 4.3.2 and earlier from deployed applications.
- Avoid parsing untrusted YAML with vulnerable deserializer behavior.
- Check current vendor guidance before accepting residual risk.
Validation and detection
- Inventory application dependencies for YamlDotNet versions.
- Review lockfiles, packages, and deployed artifacts for version 4.3.2 or earlier.
- Identify code paths that call Deserializer.Deserialize() on external YAML.
- Confirm affected applications are upgraded and redeployed.
- Regression test YAML parsing workflows after upgrade.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-1000210 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/aaubry/YamlDotNet#version-500CVE reference · x_refsource_CONFIRM
- https://github.com/aaubry/YamlDotNet/blob/f96b7cc40a0498f8bafdeb49df3aa23aa2c60993/YamlDotNet/Serialization/NodeTypeResolvers/TypeNameInTagNodeTypeResolver.cs#L35CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.