CVE-2021-23338 json
Deserialization of Untrusted Data
published 2021-02-15 5 y ago modified 2026-06-17 4 mo ago also GHSA-hjr4-fhgp-23g9 , PYSEC-2021-86 , EUVD-2021-0209
- cvss
- 6.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.7%
- EPSS 3.7% chance of exploitation in 30 days, percentile 89%
- public exploits
- 0
- none known
Summary
This affects all versions of package qlib. The workflow function in cli part of qlib was using an unsafe YAML load function.
Patch / fix
Exploit prediction
3.65% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/418sec/huntr/pull/1329 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.6 | 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 |
| CNA | 3.1 | 6.6 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.5 | AV:N/AC:L/Au:S/C:P/I:P/A:P |
| GitHub | 3.1 | 6.6 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | pyqlib | <0.7.0 <0.6.3 |
0.7.0 0.6.3 |
Affected products
- n/a qlib
Classification
References
-
github.com
/418sec/huntr/pull/1329
web, exploit, patch, third-party-advisory
-
snyk.io
/vuln/SNYK-PYTHON-QLIB-1054635
web, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-23338
advisory
-
github.com
/microsoft/qlib
package
-
github.com
/pypa/advisory-database/tree/main/vulns/pyqlib/PYSEC-2021-86.yaml
web
-
security.snyk.io
/vuln/SNYK-PYTHON-PYQLIB-1085990
web
-
github.com
/advisories/GHSA-hjr4-fhgp-23g9
advisory
Sources
- CVE List CVE-2021-23338
- GitHub Advisory GHSA-hjr4-fhgp-23g9
- NVD CVE-2021-23338
- OSV PYSEC-2021-86
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.