openstack-mistral: Potential Mistral Denial of Service handling recursive YAML anchor expansion
Published Jun 15, 2020
7.1
HIGHCVSS 4.0
EPSS 1.19%
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 n/a Product Openstack-Mistral Defaultn/a
- Version up to and including 7.0.3StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Openstack-Mistral | n/a |
|
- ≤ 7.0.3
No data.
Red Hat OpenStack Platform 10 (Newton)
openstack-mistral
Will not fix
Red Hat OpenStack Platform 12 (Pike)
openstack-mistral
Out of support scope
Red Hat OpenStack Platform 13 (Queens)
openstack-mistral
Will not fix
Red Hat OpenStack Platform 14 (Rocky)
openstack-mistral
Will not fix
Red Hat OpenStack Platform 15 (Stein)
openstack-mistral
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat OpenStack Platform 10 (Newton) | openstack-mistral | Will not fix | n/a |
| Red Hat OpenStack Platform 12 (Pike) | openstack-mistral | Out of support scope | n/a |
| Red Hat OpenStack Platform 13 (Queens) | openstack-mistral | Will not fix | n/a |
| Red Hat OpenStack Platform 14 (Rocky) | openstack-mistral | Will not fix | n/a |
| Red Hat OpenStack Platform 15 (Stein) | openstack-mistral | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:L/Au:S/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 1.19% (0.01185) | 66.74th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.19% (0.01185) | 66.44th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.07% (0.00068) | 30.26th | v3 (v2023.03.01) |
| Jun 12, 2024 | 0.07% (0.00068) | 29.71th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.07% (0.00068) | 27.70th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.78% (0.00777) | 21.50th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.78% (0.00777) | 0.00th | v1 |
References (8)
- https://access.redhat.com/security/cve/CVE-2018-16848 Vendor Advisory
- https://bugs.launchpad.net/mistral/+bug/1785657 x_refsource_MISCThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1645332 x_refsource_MISCIssue TrackingVendor Advisory
- https://github.com/advisories/GHSA-443j-6p7g-6v4w Advisory
- https://github.com/openstack/mistral/commit/eac23d9e774f658f9d4743c99aa2743eb104c3f9
- https://github.com/pypa/advisory-database/tree/main/vulns/mistral/PYSEC-2020-240.yaml
- https://nvd.nist.gov/vuln/detail/CVE-2018-16848
- https://www.cve.org/CVERecord?id=CVE-2018-16848
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2018-16848 | Vendor Advisory | |
| https://bugs.launchpad.net/mistral/+bug/1785657 | x_refsource_MISCThird Party Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1645332 | x_refsource_MISCIssue TrackingVendor Advisory | |
| https://github.com/advisories/GHSA-443j-6p7g-6v4w | Advisory | |
| https://github.com/openstack/mistral/commit/eac23d9e774f658f9d4743c99aa2743eb104c3f9 | ||
| https://github.com/pypa/advisory-database/tree/main/vulns/mistral/PYSEC-2020-240.yaml | ||
| https://nvd.nist.gov/vuln/detail/CVE-2018-16848 | ||
| https://www.cve.org/CVERecord?id=CVE-2018-16848 |
Change history (0)
No recorded changes yet.