4.8

CVE-2026-66139: openstack zaqar

CVSS: 4.8v3.1MediumDeferred
AliasesUBUNTU-CVE-2026-66139DEBIAN-CVE-2026-66139
Published 24-07-2026Last modified 24-07-2026
Open JSON

Vulnerability summary

CVE-2026-66139 is a medium (CVSS 4.8) vulnerability in openstack zaqar. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 39.7% of scored vulnerabilities.

Overall risk
19/100
0100
Low · default modelHow is this calculated?
CVSS score
4.8/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.48%
0%100%
Low · +0.15 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 24-07-2026
    PublishedVulnerability first disclosed.
  2. 24-07-2026
    Last modifiedVulnerability information updated.

Description

OpenStack Zaqar through 22.0.0 allows authentication bypass via an EXTRA-SPEC header when a UUID is known.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.48%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

+0.15 pp

From 0.33% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.48%

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
  • zaqarAll versions (No fix recorded) | < 22.0.0-3
Openstack1 product
  • zaqar≥ 12.0.0, < 20.1.1 | 21.0.0 | 22.0.0
Ubuntu1 product
  • zaqarAll versions (No fix recorded)

3 vendors · 3 products

References

7 links