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CVE-2026-66139

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

4.8 MediumFix available

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

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
Low

Exploit likelihood

0.48%Up 0.2 points since Jul 24, 2026
90%50%10%1%

What each source reports

CVE List Score used 4.8

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

Record
CVE-2026-66139
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness
CWE-306
Updated
2026-11-02
EUVDEUVD-2026-48477 4.8

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

Record
EUVD-2026-48477
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-gmmh-575h-g7v8 4.8

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

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

Record
GHSA-gmmh-575h-g7v8
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness
CWE-306
Updated
2026-11-02
NVD 4.8

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

Record
CVE-2026-66139
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness
CWE-306
Updated
2026-11-02
OSVDEBIAN-CVE-2026-66139 4.8

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

Record
DEBIAN-CVE-2026-66139
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2026-66139 4.8

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

Record
UBUNTU-CVE-2026-66139
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
zaqar
Debian:12
 All versions, plus listed versions
15.0.0-116.0.0-116.0.0-216.0.0-316.0.0~rc1-1
Show 31 moreShow less
17.0.0-117.0.0~rc1-118.0.0-118.0.0~rc1-119.0.0-119.0.0-219.0.0-319.0.0-419.0.0~rc1-119.0.0~rc1-220.0.0-120.0.0-220.0.0~rc1-120.0.0~rc1-221.0.0-121.0.0-221.0.0~rc1-121.0.0~rc1-222.0.0-122.0.0-222.0.0-322.0.0~rc1-122.0.0~rc1-222.0.1-123.0.0-123.0.0-223.0.0-323.0.0-423.0.0~rc1-123.0.0~rc1-223.0.0~rc1-3
 None known
zaqar
Debian:13
 All versions, plus listed versions
20.0.0-221.0.0-121.0.0-221.0.0~rc1-121.0.0~rc1-2
Show 13 moreShow less
22.0.0-122.0.0-222.0.0-322.0.0~rc1-122.0.0~rc1-222.0.1-123.0.0-123.0.0-223.0.0-323.0.0-423.0.0~rc1-123.0.0~rc1-223.0.0~rc1-3
 None known
zaqar
Debian:14
 before 22.0.0-3, plus listed versions
20.0.0-221.0.0-121.0.0-221.0.0~rc1-121.0.0~rc1-2
Show 4 moreShow less
22.0.0-122.0.0-222.0.0~rc1-122.0.0~rc1-2
22.0.0-3
zaqar
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.0.0-21.0.0-62.0.0-1
 None known
zaqar
Ubuntu:18.04:LTS
 All versions, plus listed versions
5.0.0-0ubuntu16.0.0~b1-0ubuntu16.0.0~b2-0ubuntu26.0.0~b3-0ubuntu16.0.0~rc1-0ubuntu16.0.0-0ubuntu1
 None known
zaqar
Ubuntu:20.04:LTS
 All versions, plus listed versions
9.0.0-0ubuntu110.0.0~b1~git2019121815.55c73e22-0ubuntu110.0.0~b2~git2020021011.22c457a5-0ubuntu110.0.0~b3~git2020032614.22c457a5-0ubuntu110.0.0~b3~git2020041014.22c457a5-0ubuntu110.0.0-0ubuntu0.20.04.1
 None known
zaqar
Ubuntu:22.04:LTS
 All versions, plus listed versions
13.0.0-0ubuntu113.0.0+git2021120910.a7593240-0ubuntu113.0.0+git2022011310.1726ac41-0ubuntu114.0.0-0ubuntu1
 None known
zaqar
Ubuntu:24.04:LTS
 All versions, plus listed versions
17.0.0-0ubuntu117.0.0+git2024020808.2c859275-0ubuntu118.0.0~rc1-0ubuntu118.0.0-0ubuntu1
 None known
zaqar
Ubuntu:26.10
 All versions, plus listed versions
22.0.0-0ubuntu122.0.0+git20260723.62.36e0796-0ubuntu123.0.0~rc1-0ubuntu123.0.0-0ubuntu1
 None known
zaqar
Ubuntu:26.04:LTS
 All versions, plus listed versions
21.0.0-0ubuntu121.0.0+git20260121.32.59a7a63d-0ubuntu122.0.0~rc1-0ubuntu222.0.0-0ubuntu1
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-66139 is a medium vulnerability (CVSS 4.8) in Openstack Zaqar, published July 24, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.48%, the 41st percentile. Fixed in zaqar 22.0.0-3.

References

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