UBUNTU-CVE-2026-93894

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Source
https://ubuntu.com/security/CVE-2026-93894
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-93894
Upstream
  • CVE-2026-93894
Published
2026-09-21T00:00:00Z
Modified
2026-09-21T21:40:59Z
Severity
  • 2.3 (Low) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/AU:N/R:A/V:D/RE:L/U:Clear CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

In Vinyl Cache before 9.0,2, workspace buffer overflow vulnerability was found in the .upper() and .lower() string type methods of VCL. This can be used as a remote denial of service (DoS) vector to make the child process segfault or assert, and then restart. Effectively exploiting this vulnerability requires prior knowledge about the VCL in use and the ability to craft a request that contains a string that is long enough to fill the remaining workspace at the call site while staying under the different request size limits (http_req_size, http_req_hdr_len, etc.).

References

Affected packages

Ubuntu:14.04:LTS
varnish

Package

Name
varnish
Purl
pkg:deb/ubuntu/varnish?arch=source&distro=trusty

Affected ranges

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

Affected versions

3.*
3.0.4-1ubuntu1
3.0.4-1ubuntu2
3.0.5-1ubuntu2
3.0.5-2
3.0.5-2ubuntu0.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libvarnishapi1",
            "binary_version":  "3.0.5-2ubuntu0.1"
        },
        {
            "binary_name":  "varnish",
            "binary_version":  "3.0.5-2ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json"
Ubuntu:24.04:LTS
varnish

Package

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

Affected ranges

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

Affected versions

7.*
7.1.1-1.1ubuntu1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libvarnishapi3",
            "binary_version":  "7.1.1-1.1ubuntu1"
        },
        {
            "binary_name":  "varnish",
            "binary_version":  "7.1.1-1.1ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json"
Ubuntu:26.04:LTS
varnish

Package

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

Affected ranges

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

Affected versions

7.*
7.7.3-1
7.7.3-1build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libvarnishapi3",
            "binary_version":  "7.7.3-1build1"
        },
        {
            "binary_name":  "varnish",
            "binary_version":  "7.7.3-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json"
Ubuntu:Pro:16.04:LTS
varnish

Package

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

Affected ranges

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

Affected versions

4.*
4.0.3-1
4.1.0-1
4.1.0-2
4.1.1-1
4.1.1-1ubuntu0.2
4.1.1-1ubuntu0.2+esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libvarnishapi1",
            "binary_version":  "4.1.1-1ubuntu0.2+esm1"
        },
        {
            "binary_name":  "varnish",
            "binary_version":  "4.1.1-1ubuntu0.2+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json"
Ubuntu:Pro:18.04:LTS
varnish

Package

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

Affected ranges

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

Affected versions

5.*
5.0.0-7.1
5.2.1-1
5.2.1-1ubuntu0.1
5.2.1-1ubuntu0.1+esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libvarnishapi1",
            "binary_version":  "5.2.1-1ubuntu0.1+esm1"
        },
        {
            "binary_name":  "varnish",
            "binary_version":  "5.2.1-1ubuntu0.1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json"
Ubuntu:Pro:20.04:LTS
varnish

Package

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

Affected ranges

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

Affected versions

6.*
6.1.1-1
6.2.1-2
6.2.1-2ubuntu0.1~esm1
6.2.1-2ubuntu0.1~esm2
6.2.1-2ubuntu0.1
6.2.1-2ubuntu0.2
6.2.1-2ubuntu0.2+esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libvarnishapi2",
            "binary_version":  "6.2.1-2ubuntu0.2+esm1"
        },
        {
            "binary_name":  "varnish",
            "binary_version":  "6.2.1-2ubuntu0.2+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json"
Ubuntu:Pro:22.04:LTS
varnish

Package

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

Affected ranges

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

Affected versions

6.*
6.5.2-1
6.6.1-1
6.6.1-1ubuntu0.2
6.6.1-1ubuntu0.2+esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libvarnishapi2",
            "binary_version":  "6.6.1-1ubuntu0.2+esm1"
        },
        {
            "binary_name":  "varnish",
            "binary_version":  "6.6.1-1ubuntu0.2+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json"