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Fencer Vulns
medium 6.5

CVE-2018-16848 json

OpenStack Mistral DoS

published 2020-06-15 6 y ago modified 2026-06-17 4 mo ago also GHSA-443j-6p7g-6v4w , PYSEC-2020-240 , EUVD-2020-0112

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi mistral 7.0.4, 10.0.0
  • mistral Debian 14, Debian 13, Debian 12 10.0.0~rc1-2

debian advisories DEBIAN-CVE-2018-16848

  • mistral Ubuntu Pro 18.04 LTS 6.0.0-0ubuntu1.1+esm1

ubuntu advisories UBUNTU-CVE-2018-16848

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-16848 updated cvss 6.5

openstack-mistral: Potential Mistral Denial of Service handling recursive YAML anchor expansion

  • Red Hat OpenStack Platform 10 (Newton) openstack-mistral, python-mistral-tests, openstack-mistral-all, openstack-mistral-api, openstack-mistral-common, openstack-mistral-engine, +2 more
    affected: no fix planned “Will not fix”
  • Red Hat OpenStack Platform 12 (Pike) python-mistral, python-mistral-tests, openstack-mistral-all, openstack-mistral-api, openstack-mistral-common, openstack-mistral-engine, +2 more
    affected: no fix planned “Out of support scope”
  • Red Hat OpenStack Platform 13 (Queens) python-mistral, openstack-mistral, python-mistral-tests, openstack-mistral-all, openstack-mistral-api, openstack-mistral-common, +3 more Red Hat OpenStack Platform 14 (Rocky) python-mistral, python-mistral-tests, openstack-mistral-all, openstack-mistral-api, openstack-mistral-common, openstack-mistral-engine, +2 more Red Hat OpenStack Platform 15 (Stein) python3-mistral, openstack-mistral-all, openstack-mistral-api, openstack-mistral-common, openstack-mistral-engine, openstack-mistral-executor, +2 more
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.18% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi mistral
<10.0.0
<7.0.4
10.0.0
7.0.4

Affected products

  • n/a openstack-mistral

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

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.