UBUNTU-CVE-2026-93712

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Source
https://ubuntu.com/security/CVE-2026-93712
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93712.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-93712
Upstream
Published
2026-09-22T01:16:00Z
Modified
2026-09-24T02:03:13Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Dancer2 versions from 2.1.0 before 2.2.0 for Perl serve files from outside public_dir via relative path segments in the File route handler. The handler joins the request path onto public_dir without collapsing relative segments, and checks only that the result is a readable regular file. A request for /../outside.txt escapes public_dir, and percent-encoding the dots reaches the same file. The handler is off by default. An application is affected once it names File in route_handlers and sets static_handler to 0, which otherwise refuses a dot segment before the route runs. Any file the worker process can read is served to an unauthenticated request, including the application's config.yml above public_dir.

References

Affected packages

Ubuntu:16.04:LTS
libdancer2-perl

Package

Name
libdancer2-perl
Purl
pkg:deb/ubuntu/libdancer2-perl?arch=source&distro=xenial

Affected ranges

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

Affected versions

0.*
0.160003+dfsg-1
0.163000+dfsg-1
0.166001+dfsg-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libdancer2-perl",
            "binary_version":  "0.166001+dfsg-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93712.json"
Ubuntu:18.04:LTS
libdancer2-perl

Package

Name
libdancer2-perl
Purl
pkg:deb/ubuntu/libdancer2-perl?arch=source&distro=bionic

Affected ranges

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

Affected versions

0.*
0.205000+dfsg-1
0.205002+dfsg-1
0.205002+dfsg-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libdancer2-perl",
            "binary_version":  "0.205002+dfsg-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93712.json"
Ubuntu:20.04:LTS
libdancer2-perl

Package

Name
libdancer2-perl
Purl
pkg:deb/ubuntu/libdancer2-perl?arch=source&distro=focal

Affected ranges

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

Affected versions

0.*
0.208001+dfsg-1
0.208002+dfsg-1
0.300000+dfsg-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libdancer2-perl",
            "binary_version":  "0.300000+dfsg-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93712.json"
Ubuntu:22.04:LTS
libdancer2-perl

Package

Name
libdancer2-perl
Purl
pkg:deb/ubuntu/libdancer2-perl?arch=source&distro=jammy

Affected ranges

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

Affected versions

0.*
0.300005+dfsg-1
0.301004+dfsg-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libdancer2-perl",
            "binary_version":  "0.301004+dfsg-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93712.json"
Ubuntu:24.04:LTS
libdancer2-perl

Package

Name
libdancer2-perl
Purl
pkg:deb/ubuntu/libdancer2-perl?arch=source&distro=noble

Affected ranges

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

Affected versions

0.*
0.400001+dfsg-1
1.*
1.0.0+dfsg-1
1.1.0+dfsg-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libdancer2-perl",
            "binary_version":  "1.1.0+dfsg-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93712.json"
Ubuntu:26.04:LTS
libdancer2-perl

Package

Name
libdancer2-perl
Purl
pkg:deb/ubuntu/libdancer2-perl?arch=source&distro=resolute

Affected ranges

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

Affected versions

1.*
1.1.2+dfsg-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libdancer2-perl",
            "binary_version":  "1.1.2+dfsg-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93712.json"