UBUNTU-CVE-2026-111458

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Source
https://ubuntu.com/security/CVE-2026-111458
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111458.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-111458
Upstream
Published
2026-10-16T00:00:00Z
Modified
2026-10-17T12:59:52Z
Severity
  • 6.8 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

The fanx_fingerprint function in ssl/sslxprint.c of ssldump allocates a heap buffer for formatting FAN/1 X.509 certificate fingerprints. The allocation size is computed as strlen(b64) + strlen(hex) + 31, but the format string "fan1:x509:server:passive:%s:sha256:%s" contains 33 fixed characters in addition to the two variable-length fields and a null terminator, requiring strlen(b64) + strlen(hex) + 34 bytes. This miscalculation results in a 3-byte heap-based buffer overflow on every invocation of the function with valid inputs. The overflow occurs because sprintf writes the full formatted string into the undersized heap buffer without bounds checking. An attacker who can supply a crafted pcap file containing a TLS X.509 certificate to a user running ssldump with FAN/1 fingerprinting enabled (for example with the -j -N options) can trigger the overflow. The resulting heap corruption may lead to denial of service through a crash or, in a worst-case scenario, arbitrary code execution in the context of the user running ssldump. The vulnerability is deterministic and requires no special privileges beyond the ability to provide input to the tool.

References

Affected packages

Ubuntu:16.04:LTS
ssldump

Package

Name
ssldump
Purl
pkg:deb/ubuntu/ssldump?arch=source&distro=xenial

Affected ranges

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

Affected versions

0.*
0.9b3-4.1ubuntu1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "ssldump",
            "binary_version":  "0.9b3-4.1ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111458.json"
Ubuntu:18.04:LTS
ssldump

Package

Name
ssldump
Purl
pkg:deb/ubuntu/ssldump?arch=source&distro=bionic

Affected ranges

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

Affected versions

0.*
0.9b3-6
0.9b3-7build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "ssldump",
            "binary_version":  "0.9b3-7build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111458.json"
Ubuntu:20.04:LTS
ssldump

Package

Name
ssldump
Purl
pkg:deb/ubuntu/ssldump?arch=source&distro=focal

Affected ranges

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

Affected versions

0.*
0.9b3+git20180706.eb8fdd4-1
1.*
1.1-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "ssldump",
            "binary_version":  "1.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111458.json"
Ubuntu:22.04:LTS
ssldump

Package

Name
ssldump
Purl
pkg:deb/ubuntu/ssldump?arch=source&distro=jammy

Affected ranges

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

Affected versions

1.*
1.3-2
1.3-2build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "ssldump",
            "binary_version":  "1.3-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111458.json"
Ubuntu:24.04:LTS
ssldump

Package

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

Affected ranges

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

Affected versions

1.*
1.5-1
1.8-1
1.8-1build1
1.8-1build2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "ssldump",
            "binary_version":  "1.8-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111458.json"
Ubuntu:26.04:LTS
ssldump

Package

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

Affected ranges

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

Affected versions

1.*
1.9-1
1.9-1build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "ssldump",
            "binary_version":  "1.9-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111458.json"
Ubuntu:26.10
ssldump

Package

Name
ssldump
Purl
pkg:deb/ubuntu/ssldump?arch=source&distro=stonking

Affected ranges

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

Affected versions

1.*
1.9-1build1
1.9-2
1.9-2build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "ssldump",
            "binary_version":  "1.9-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111458.json"