CVE-2021-44657 json
In StackStorm versions prior to 3.6.0, the jinja interpreter was not run in sandbox mode and thus allows execution of unsafe system command…
published 2021-12-15 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-31477
- cvss
- 8.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.6%
- EPSS 2.6% chance of exploitation in 30 days, percentile 85%
- public exploits
- 0
- none known
Summary
In StackStorm versions prior to 3.6.0, the jinja interpreter was not run in sandbox mode and thus allows execution of unsafe system commands. Jinja does not enable sandboxed mode by default due to backwards compatibility. Stackstorm now sets sandboxed mode for jinja by default.
Patch / fix
Exploit prediction
2.56% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- podalirius.net https://podalirius.net/en/articles/python-vulnerabilities-code-execution-in-jinja-templates/ referenced PoC, tagged "exploit" by a source, unverified
- github.com https://github.com/pallets/jinja/issues/549 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 9.0 | AV:N/AC:L/Au:S/C:C/I:C/A:C |
References
-
github.com
/StackStorm/st2/pull/5359
patch, third-party-advisory
-
podalirius.net
/en/articles/python-vulnerabilities-code-execution-in-jinja-templates/
exploit, third-party-advisory
-
github.com
/pallets/jinja/issues/549
exploit, issue-tracking, third-party-advisory
-
stackstorm.com
/2021/12/16/stackstorm-v3-6-0-released/
release-notes, vendor-advisory
Sources
- CVE List CVE-2021-44657
- NVD CVE-2021-44657
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