9.6

CVE-2026-71193: openstack designate Incorrect Authorization

CVSS: 9.6v3.1CriticalAwaiting analysis
AliasesUBUNTU-CVE-2026-71193USN-8860-1DEBIAN-CVE-2026-71193
Published 12-08-2026Last modified 13-08-2026
Open JSON

Vulnerability summary

CVE-2026-71193 is a critical (CVSS 9.6) Incorrect Authorization vulnerability in openstack designate. EPSS estimates a 0.53% chance of exploitation in the next 30 days, higher than 43.3% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.6/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.53%
0%100%
Low · +0.16 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-08-2026
    PublishedVulnerability first disclosed.
  2. 13-08-2026
    Last modifiedVulnerability information updated.

Description

In OpenStack Designate before 22.0.1, zone creation checks (_is_subzone, _is_superzone, and the duplicate-zone DB constraint) are scoped to the target pool only. An authenticated user can bypass these checks by scheduling a zone to a different pool via the AttributeFilter scheduler, creating an overlapping zone that conflicts with another tenant's zone. This enables cross-tenant DNS hijack (redirecting traffic to attacker-controlled IPs) and DNS denial of service (NODATA responses). Exploitation requires a multi-pool deployment with AttributeFilter enabled in scheduler_filters, which is a non-default but documented and supported configuration for self-service tiering.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.53%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

+0.16 pp

From 0.37% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.53%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • designate< 1:15.0.2-0+deb11u1 | < 1:20.0.0-2+deb13u1 | < 1:22.0.0-2
Openstack1 product
  • designate≥ 1.0.0, < 20.0.2 | ≥ 21.0.0, < 21.0.1 | ≥ 22.0.0, < 22.0.1
Ubuntu1 product
  • designate< 1:2.1.0-0ubuntu1+esm1 | < 1:6.0.1-0ubuntu1.2+esm1 | < 1:10.0.2-0ubuntu1+esm1 | < 1:14.0.4-0ubuntu1.1 | < 1:18.0.0-0ubuntu1.1 | < 1:22.0.0-0ubuntu2.1

3 vendors · 3 products

References

8 links