TI-2021-20192 Aliases CVE-2021-44657 GHSA-734q-6f9p-wxpv

In StackStorm versions prior to 3.6.0, the jinja interpreter was not run in sandbox mode…

MEDIUM 43Published 2021-12-15 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

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.

Why it matters now

EPSS 0.02555 85th percentileScored 2026-11-07

Public exploit Yes 2 exploit referencesTagged by NVD

Fix No fix listed No fixed version in the sources yet

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
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:stackstorm:stackstorm::::::::	before 3.6.0	Vulnerable	StackStorm

cpe:2.3:a:stackstorm:stackstorm:*:*:*:*:*:*:*:* Versions before 3.6.0 Vulnerable ·StackStorm

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-44657
2026-10-03 Alias added: GHSA-734q-6f9p-wxpv

References

Exploit 2

Patch 1

https://github.com/StackStorm/st2/pull/5359

Advisory 1

https://stackstorm.com/2021/12/16/stackstorm-v3-6-0-released/

TI-2022-21635 Improper access control in Key-Value RBAC in StackStorm version 3.7.0 didn't check the… CVSS 3.1HIGH 7.5
TI-2021-09734 StackStorm before 3.4.1, in some situations, has an infinite loop that consumes all… CVSS 3.1HIGH 7.5
TI-2019-06999 In st2web in StackStorm Web UI before 2.9.3 and 2.10.x before 2.10.3, it is possible to… CVSS 3.0MEDIUM 6.1
TI-2022-21463 Cross-site scripting (XSS) vulnerability in the Web UI of StackStorm versions prior to… CVSS 3.1MEDIUM 5.4
TI-2018-14401 Incorrect access control in StackStorm API (st2api) in StackStorm before 2.9.2 and 2.10.x… CVSS 3.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences