UBUNTU-CVE-2026-93861

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Source
https://ubuntu.com/security/CVE-2026-93861
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93861.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-93861
Upstream
Published
2026-10-08T18:18:00Z
Modified
2026-10-17T13:01:18Z
Severity
  • 6.0 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

In OpenStack Mistral through 23.0.0, the workflow membership API lets a project that has accepted a share of another project's private workflow create a further membership naming a third project. The new membership row is created with its project_id defaulted to the accepting project rather than the original workflow owner, and thus the owner can neither see nor delete it. The third project can accept this membership (that it had not actually been granted by the owner), and then read and execute the owner's private workflow; only the accepting (not the owning) project can later revoke that access.

References

Affected packages

Ubuntu:20.04:LTS
mistral

Package

Name
mistral
Purl
pkg:deb/ubuntu/mistral?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.0.0-0ubuntu1
10.*
10.0.0~b1~git2019121815.bc46b29f-0ubuntu1
10.0.0~b2~git2020020609.5b5576dd-0ubuntu1
10.0.0~b3~git2020032611.8a5d35ac-0ubuntu1
10.0.0~b3~git2020041013.a7da00d7-0ubuntu1
10.0.0-0ubuntu0.20.04.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "mistral-api",
            "binary_version":  "10.0.0-0ubuntu0.20.04.1"
        },
        {
            "binary_name":  "mistral-common",
            "binary_version":  "10.0.0-0ubuntu0.20.04.1"
        },
        {
            "binary_name":  "mistral-engine",
            "binary_version":  "10.0.0-0ubuntu0.20.04.1"
        },
        {
            "binary_name":  "mistral-event-engine",
            "binary_version":  "10.0.0-0ubuntu0.20.04.1"
        },
        {
            "binary_name":  "mistral-executor",
            "binary_version":  "10.0.0-0ubuntu0.20.04.1"
        },
        {
            "binary_name":  "python3-mistral",
            "binary_version":  "10.0.0-0ubuntu0.20.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93861.json"
Ubuntu:22.04:LTS
mistral

Package

Name
mistral
Purl
pkg:deb/ubuntu/mistral?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

13.*
13.0.0-0ubuntu1
13.0.0+git2021120910.b2d6de56-0ubuntu1
13.0.0+git2022030313.55bb2564-0ubuntu1
14.*
14.0.0-0ubuntu1
14.0.0-0ubuntu1.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "mistral-api",
            "binary_version":  "14.0.0-0ubuntu1.1"
        },
        {
            "binary_name":  "mistral-common",
            "binary_version":  "14.0.0-0ubuntu1.1"
        },
        {
            "binary_name":  "mistral-engine",
            "binary_version":  "14.0.0-0ubuntu1.1"
        },
        {
            "binary_name":  "mistral-event-engine",
            "binary_version":  "14.0.0-0ubuntu1.1"
        },
        {
            "binary_name":  "mistral-executor",
            "binary_version":  "14.0.0-0ubuntu1.1"
        },
        {
            "binary_name":  "python3-mistral",
            "binary_version":  "14.0.0-0ubuntu1.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93861.json"
Ubuntu:24.04:LTS
mistral

Package

Name
mistral
Purl
pkg:deb/ubuntu/mistral?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

17.*
17.0.0-0ubuntu1
18.*
18.0.0~rc1-0ubuntu1
18.0.1-0ubuntu1
18.0.1-0ubuntu1.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "mistral-api",
            "binary_version":  "18.0.1-0ubuntu1.1"
        },
        {
            "binary_name":  "mistral-common",
            "binary_version":  "18.0.1-0ubuntu1.1"
        },
        {
            "binary_name":  "mistral-engine",
            "binary_version":  "18.0.1-0ubuntu1.1"
        },
        {
            "binary_name":  "mistral-event-engine",
            "binary_version":  "18.0.1-0ubuntu1.1"
        },
        {
            "binary_name":  "mistral-executor",
            "binary_version":  "18.0.1-0ubuntu1.1"
        },
        {
            "binary_name":  "python3-mistral",
            "binary_version":  "18.0.1-0ubuntu1.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93861.json"
Ubuntu:26.04:LTS
mistral

Package

Name
mistral
Purl
pkg:deb/ubuntu/mistral?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

21.*
21.0.0-0ubuntu1
21.0.0+git20260106.10.420677c8-0ubuntu1
22.*
22.0.0-0ubuntu1
22.0.0-0ubuntu1.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "mistral-api",
            "binary_version":  "22.0.0-0ubuntu1.1"
        },
        {
            "binary_name":  "mistral-common",
            "binary_version":  "22.0.0-0ubuntu1.1"
        },
        {
            "binary_name":  "mistral-engine",
            "binary_version":  "22.0.0-0ubuntu1.1"
        },
        {
            "binary_name":  "mistral-event-engine",
            "binary_version":  "22.0.0-0ubuntu1.1"
        },
        {
            "binary_name":  "mistral-executor",
            "binary_version":  "22.0.0-0ubuntu1.1"
        },
        {
            "binary_name":  "python3-mistral",
            "binary_version":  "22.0.0-0ubuntu1.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93861.json"
Ubuntu:26.10
mistral

Package

Name
mistral
Purl
pkg:deb/ubuntu/mistral?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

22.*
22.0.0-0ubuntu1
22.0.0-0ubuntu2
22.0.0+git20260814.61.b4aeb55-0ubuntu1
23.*
23.0.0~rc1-0ubuntu1
23.0.0-0ubuntu1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "mistral-api",
            "binary_version":  "23.0.0-0ubuntu1"
        },
        {
            "binary_name":  "mistral-common",
            "binary_version":  "23.0.0-0ubuntu1"
        },
        {
            "binary_name":  "mistral-engine",
            "binary_version":  "23.0.0-0ubuntu1"
        },
        {
            "binary_name":  "mistral-event-engine",
            "binary_version":  "23.0.0-0ubuntu1"
        },
        {
            "binary_name":  "mistral-executor",
            "binary_version":  "23.0.0-0ubuntu1"
        },
        {
            "binary_name":  "python3-mistral",
            "binary_version":  "23.0.0-0ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93861.json"
Ubuntu:Pro:16.04:LTS
mistral

Package

Name
mistral
Purl
pkg:deb/ubuntu/mistral?arch=source&distro=esm-apps%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.0.0-1
1.0.0-4
2.*
2.0.0~b3-3
2.0.0~rc1-1
2.0.0~rc2-1
2.0.0-1
2.0.0-1ubuntu2
2.0.0-1ubuntu2+esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "mistral-api",
            "binary_version":  "2.0.0-1ubuntu2+esm1"
        },
        {
            "binary_name":  "mistral-common",
            "binary_version":  "2.0.0-1ubuntu2+esm1"
        },
        {
            "binary_name":  "mistral-engine",
            "binary_version":  "2.0.0-1ubuntu2+esm1"
        },
        {
            "binary_name":  "mistral-executor",
            "binary_version":  "2.0.0-1ubuntu2+esm1"
        },
        {
            "binary_name":  "python-mistral",
            "binary_version":  "2.0.0-1ubuntu2+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93861.json"
Ubuntu:Pro:18.04:LTS
mistral

Package

Name
mistral
Purl
pkg:deb/ubuntu/mistral?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

5.*
5.0.0-0ubuntu1
6.*
6.0.0~b1-0ubuntu1
6.0.0~b1-0ubuntu2
6.0.0~b2-0ubuntu1
6.0.0~rc1-0ubuntu1
6.0.0-0ubuntu1
6.0.0-0ubuntu1.1
6.0.0-0ubuntu1.1+esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "mistral-api",
            "binary_version":  "6.0.0-0ubuntu1.1+esm1"
        },
        {
            "binary_name":  "mistral-common",
            "binary_version":  "6.0.0-0ubuntu1.1+esm1"
        },
        {
            "binary_name":  "mistral-engine",
            "binary_version":  "6.0.0-0ubuntu1.1+esm1"
        },
        {
            "binary_name":  "mistral-event-engine",
            "binary_version":  "6.0.0-0ubuntu1.1+esm1"
        },
        {
            "binary_name":  "mistral-executor",
            "binary_version":  "6.0.0-0ubuntu1.1+esm1"
        },
        {
            "binary_name":  "python-mistral",
            "binary_version":  "6.0.0-0ubuntu1.1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93861.json"