Description
A Denial of Service (DoS) condition is possible in OpenStack Mistral in versions up to and including 7.0.3. Submitting a specially crafted workflow definition YAML file containing nested anchors can lead to resource exhaustion culminating in a denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | openstack-mistral | up to and including 7.0.3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | mistral | 10.0.0~rc1-2 | — |
| Debian 13 | mistral | 10.0.0~rc1-2 | — |
| Debian 12 | mistral | 10.0.0~rc1-2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | mistral | 6.0.0-0ubuntu1.1+esm1 | USN-7465-1 |
| Ubuntu Pro 18.04 LTS | python-mistral-lib | 0.4.0-0ubuntu1+esm1 | USN-7465-1 |
| Ubuntu Pro 16.04 LTS | mistral | 2.0.0-1ubuntu2+esm1 | USN-7465-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | mistral | < 10.0.0 | 10.0.0 | GHSA-443j-6p7g-6v4w |
| PyPI | mistral | < 7.0.4 | 7.0.4 | PYSEC-2020-240 |
Advisories 1
- USN-7465-1 mistral, python-mistral-lib vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026