UBUNTU-CVE-2026-5081

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Source
https://ubuntu.com/security/CVE-2026-5081
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5081.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-5081
Upstream
  • CVE-2026-5081
Published
2026-05-06T13:16:00Z
Modified
2026-06-30T18:15:52Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
  • 8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Apache::Session::Generate::ModUniqueId versions from 1.54 through 1.94 for Perl session ids are insecure. Apache::Session::Generate::ModUniqueId (added in version 1.54) uses the value of the UNIQUE_ID environment variable for the session id. The UNIQUE_ID variable is set by the Apache mod_unique_id plugin, which generates unique ids for the request. The id is based on the IPv4 address, the process id, the epoch time, a 16-bit counter and a thread index, with no obfuscation. The server IP is often available to the public, and if not available, can be guessed from previous session ids being issued. The process ids may also be guessed from previous session ids. The timestamp is easily guessed (and leaked in the HTTP Date response header). The purpose of mod_unique_id is to assign a unique id to requests so that events can be correlated in different logs. The id is not designed, nor is it suitable for security purposes.

References

Affected packages

Ubuntu:16.04:LTS
libapache-session-perl

Package

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

Affected ranges

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

Affected versions

1.*
1.93-2
1.93-2ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-session-perl",
            "binary_version": "1.93-2ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5081.json"
Ubuntu:18.04:LTS
libapache-session-perl

Package

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

Affected ranges

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

Affected versions

1.*
1.93-2ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-session-perl",
            "binary_version": "1.93-2ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5081.json"
Ubuntu:20.04:LTS
libapache-session-perl

Package

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

Affected ranges

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

Affected versions

1.*
1.93-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-session-perl",
            "binary_version": "1.93-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5081.json"
Ubuntu:22.04:LTS
libapache-session-perl

Package

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

Affected ranges

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

Affected versions

1.*
1.94-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-session-perl",
            "binary_version": "1.94-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5081.json"
Ubuntu:24.04:LTS
libapache-session-perl

Package

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

Affected ranges

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

Affected versions

1.*
1.94-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-session-perl",
            "binary_version": "1.94-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5081.json"
Ubuntu:25.10
libapache-session-perl

Package

Name
libapache-session-perl
Purl
pkg:deb/ubuntu/libapache-session-perl?arch=source&distro=questing

Affected ranges

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

Affected versions

1.*
1.94-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-session-perl",
            "binary_version": "1.94-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5081.json"
Ubuntu:26.04:LTS
libapache-session-perl

Package

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

Affected ranges

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

Affected versions

1.*
1.94-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-session-perl",
            "binary_version": "1.94-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5081.json"