CVE-2021-23422 json
Arbitrary Code Injection
published 2021-08-16 5 y ago modified 2026-06-17 4 mo ago also GHSA-87cj-px37-rc3x , PYSEC-2021-116 , EUVD-2021-0033
- cvss
- 7.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 56%
- public exploits
- 0
- none known
Summary
This affects the package bikeshed before 3.0.0. This can occur when an untrusted source file containing Inline Tag Command metadata is processed. When an arbitrary OS command is executed, the command output would be included in the HTML output.
Patch / fix
- pypi bikeshed 3.0.0
- n/a bikeshed 3.0.0
Exploit prediction
0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
| GitHub | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | bikeshed | <3.0.0 |
3.0.0 |
Affected products
- n/a bikeshed
Classification
- Weakness
-
- CWE-78 Improper Neutralization of Special Elements used in an OS Command
References
-
github.com
/tabatkins/bikeshed/commit/b2f668fca204260b1cad28d5078e93471cb6b2dd
web, patch, third-party-advisory
-
snyk.io
/vuln/SNYK-PYTHON-BIKESHED-1537646
web, patch, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-23422
advisory
-
github.com
/pypa/advisory-database/tree/main/vulns/bikeshed/PYSEC-2021-116.yaml
web
-
github.com
/tabatkins/bikeshed
package
-
github.com
/advisories/GHSA-87cj-px37-rc3x
advisory
Sources
- CVE List CVE-2021-23422
- GitHub Advisory GHSA-87cj-px37-rc3x
- NVD CVE-2021-23422
- OSV PYSEC-2021-116
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.