CVE-2021-23338
Deserialization of Untrusted Data
This affects all versions of package qlib. The workflow function in cli part of qlib was using an unsafe YAML load function.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Deserialization of Untrusted Data
This affects all versions of package qlib. The workflow function in cli part of qlib was using an unsafe YAML load function.
- Record
CVE-2021-23338- CVSS 3.1
- 6.6 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-0209
This affects all versions of package qlib. The workflow function in cli part of qlib was using an unsafe YAML load function.
- Record
EUVD-2021-0209- CVSS 3.1
- 6.6 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-hjr4-fhgp-23g9
qlib Deserialization of Untrusted Data vulnerability
This affects all versions of package qlib. The workflow function in cli part of qlib was using an unsafe YAML load function.
- Record
GHSA-hjr4-fhgp-23g9- CVSS 3.1
- 6.6 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-94, CWE-502
- Updated
- 2026-11-02
NVD
This affects all versions of package qlib. The workflow function in cli part of qlib was using an unsafe YAML load function.
- Record
CVE-2021-23338- CVSS 3.1
- 6.6 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H - CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:P - Weakness
- CWE-502
- Updated
- 2026-11-02
OSVGHSA-hjr4-fhgp-23g9
qlib Deserialization of Untrusted Data vulnerability
This affects all versions of package qlib. The workflow function in cli part of qlib was using an unsafe YAML load function.
- Record
GHSA-hjr4-fhgp-23g9- CVSS 3.1
- 6.6 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-502, CWE-94
- Updated
- 2026-11-02
OSVPYSEC-2021-86No score
This affects all versions of package qlib. The workflow function in cli part of qlib was using an unsafe YAML load function.
- Record
PYSEC-2021-86- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
pyqlibPyPI | before 0.7.0 | 0.7.0 |
pyqlibPyPI | before 0.7.0, plus listed versions 0.5.0.dev100.5.0.dev70.5.0.dev80.5.0.dev90.5.1 Show 4 moreShow less0.5.1.dev00.6.00.6.10.6.2 | 0.7.0 |
pyqlibPyPI | before 0.6.3, plus listed versions 0.5.0.dev100.5.0.dev70.5.0.dev80.5.0.dev90.5.1 Show 4 moreShow less0.5.1.dev00.6.00.6.10.6.2 | 0.6.3 |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-23338 is a medium vulnerability (CVSS 6.6) in Microsoft Qlib, published February 15, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.94%, the 90th percentile. Fixed in pyqlib 0.7.0.