UBUNTU-CVE-2026-93711

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Source
https://ubuntu.com/security/CVE-2026-93711
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93711.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-93711
Upstream
Published
2026-09-22T01:16:00Z
Modified
2026-09-24T02:03:13Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Dancer2 versions before 2.2.0 for Perl do not strip CR and LF from response header names in headers_to_array. The routine removes CR and LF from each header value but not from the name. A name carrying them therefore reaches the PSGI server intact. A server that does not validate keys writes it to the wire, so the bytes after the CRLF arrive as their own header line. The application has to derive the header name from request data, not just the value. An attacker who controls that data adds their own headers and splits the response.

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-2026-93711.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-2026-93711.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-2026-93711.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-2026-93711.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-2026-93711.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-2026-93711.json"