The Scanner::EnsureTokensInQueue function in yaml-cpp (aka LibYaml-C++) 0.6.2 allows…
Priority LOW 34CWE-119Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-119 and the CVSS impact.
Summary
The Scanner::EnsureTokensInQueue function in yaml-cpp (aka LibYaml-C++) 0.6.2 allows remote attackers to cause a denial of service (stack consumption and application crash) via a crafted YAML file.
Why it matters now
EPSS 0.02525 84th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:yaml-cpp_project:yaml-cpp:0.6.2:*:*:*:*:*:*:* | 0.6.2 | Vulnerable | Yaml-cpp Project |
- cpe:2.3:a:yaml-cpp_project:yaml-cpp:0.6.2:*:*:*:*:*:*:* Versions 0.6.2 Vulnerable ·Yaml-cpp Project
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenStack Platform 10 (Newton) | Affected | No fix yet: Fix deferred |
| Red Hat OpenStack Platform 13 (Queens) | Affected | No fix yet: Fix deferred |
| Red Hat OpenStack Platform 14 (Rocky) | Affected | No fix yet |
| Red Hat OpenStack Platform 8 (Liberty) | Affected | No fix yet: Fix deferred |
| Red Hat OpenStack Platform 9 (Mitaka) | Affected | No fix yet: Fix deferred |
| Red Hat Satellite 6 | Affected | No fix planned: Will not fix |
| Red Hat Software Collections | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2018-20573
- 2026-10-03 Alias added: GHSA-wff4-h782-3qx9
References
More Yaml-cpp Project Yaml-cpp vulnerabilities
- TI-2017-08660 The function "Token& Scanner::peek" in scanner.cpp in yaml-cpp 0.5.3 and earlier allows… CVSS 3.0HIGH 7.5
- TI-2019-04472 The SingleDocParser::HandleFlowSequence function in yaml-cpp (aka LibYaml-C++) 0.6.2… CVSS 3.0MEDIUM 6.5
- TI-2018-14597 The SingleDocParser::HandleFlowMap function in yaml-cpp (aka LibYaml-C++) 0.6.2 allows… CVSS 3.0MEDIUM 6.5
- TI-2019-04479 An issue was discovered in singledocparser.cpp in yaml-cpp (aka LibYaml-C++) 0.6.2. CVSS 3.0MEDIUM 6.5
- TI-2017-03868 The SingleDocParser::HandleNode function in yaml-cpp (aka LibYaml-C++) 0.5.3 allows… CVSS 3.0MEDIUM 5.5
Sources
- CVE-2018-20573 · CVE Program
- CVE-2018-20573 · NVD
- FIRST EPSS
- GHSA-wff4-h782-3qx9 · GitHub Advisory Database · CC BY 4.0
- CVE-2018-20573 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences