Deserialization of untrusted data in Meta ParlAI
Priority MEDIUM 59CWE-502Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-502.
Summary
Due to use of unsafe YAML deserialization logic, an attacker with the ability to modify local YAML configuration files could provide malicious input, resulting in remote code execution or similar risks. This issue affects ParlAI prior to v1.1.0.
Why it matters now
EPSS 0.17353 97th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed ParlAI (Facebook): 1.1.0parlai (PyPI): 1.1.0
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 |
|---|---|---|---|---|---|
| Meta | ParlAI | before 1.1.0 | 1.1.0 | Patch available | CNA |
| — | parlai (PyPI) | before 1.1.0 | 1.1.0 | Patch available | GHSA-mwgj-7x7j-6966 |
- ParlAI VendorMeta Affected before 1.1.0 Fixed in 1.1.0 Patch available CNA
- parlai (PyPI) Vendor— Affected before 1.1.0 Fixed in 1.1.0 Patch available GHSA-mwgj-7x7j-6966
Remediation
- Fix · CNA ParlAI (Facebook) Fixed in 1.1.0
- Fix · GHSA-mwgj-7x7j-6966 parlai (PyPI) Fixed in 1.1.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-24040
- 2026-10-03 Alias added: GHSA-mwgj-7x7j-6966
References
Advisory 2
More Meta Parlai vulnerabilities
- TI-2021-16592 Deserialization of Untrusted Data in parlai CVSS 3.1HIGH 8.8
Sources
- CVE-2021-24040 · CVE Program
- CVE-2021-24040 · NVD
- FIRST EPSS
- GHSA-mwgj-7x7j-6966 · GitHub Advisory Database · CC BY 4.0
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