UBUNTU-CVE-2026-13577

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Source
https://ubuntu.com/security/CVE-2026-13577
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-13577.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-13577
Upstream
Published
2026-07-20T08:16:00Z
Modified
2026-07-29T10:15:51Z
Severity
  • 8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Dancer2 versions through 2.1.0 for Perl generate insecure session ids when required CSPRNG modules are unavailable. Dancer2::Core::Role::SessionFactory::generate_id silently falls back to a built-in rand-derived session id unless both Math::Random::ISAAC::XS and Crypt::URandom are available. The fallback session id is generated from a SHA-1 hash of a call to the built-in rand function, the absolute path of the Dancer2::Core::Role::SessionFactory module, an internal counter, the process id, the module instance memory address, and a shuffled string of characters (using the List::Util::shuffle function, which also uses the built-in rand function). These are all low-entropy and easily guessed sources. The built-in rand() function is seeded with 32-bits and considered unsuitable for security applications. Predictable session ids could allow an attacker to gain access to systems.

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-2026-13577.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-2026-13577.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-2026-13577.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-2026-13577.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-2026-13577.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-2026-13577.json"