UBUNTU-CVE-2026-48682

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Source

https://ubuntu.com/security/CVE-2026-48682

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48682.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-48682

Upstream

CVE-2026-48682

Published

2026-06-02T20:16:00Z

Modified

2026-06-15T20:15:13.658876414Z

Severity

5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the IPv4 packet parser. In src/simplepacketparserng.cpp, after validating that the packet contains at least sizeof(ipv4headert) bytes (20 bytes), the code advances the localpointer by '4 * ipv4header->getihl()' (line 164) without validating that (a) IHL >= 5 (the minimum valid value per RFC 791), or (b) 4 * IHL bytes are actually available in the packet. The IHL field is 4 bits, allowing values 0-15, so the advance can be 0-60 bytes. An IHL value of 15 with only 20 bytes validated causes a 40-byte over-read. An IHL of 0-4 causes the pointer to not advance past the IP header, resulting in the TCP/UDP header being parsed from IP header data (type confusion). This vulnerability is reachable via any packet capture interface.

References

Affected packages

Ubuntu:18.04:LTS / fastnetmon

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.1.3+dfsg-3

1.1.3+dfsg-4

1.1.3+dfsg-6build1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.1.3+dfsg-6build1",
            "binary_name": "fastnetmon"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48682.json"

Ubuntu:Pro:20.04:LTS / fastnetmon

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.1.4-1

1.1.4-1build3

1.1.4-1build4

1.1.4-1build5

1.1.4-1ubuntu0.1~esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.1.4-1ubuntu0.1~esm1",
            "binary_name": "fastnetmon"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48682.json"

Ubuntu:Pro:24.04:LTS / fastnetmon

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.2.5-1

1.2.6-1

1.2.6-1build1

1.2.6-1build2

1.2.6-1build3

1.2.6-1build4

1.2.6-1ubuntu0.1~esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.2.6-1ubuntu0.1~esm1",
            "binary_name": "fastnetmon"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48682.json"

Ubuntu:25.10 / fastnetmon

Package

Name: fastnetmon
Purl: pkg:deb/ubuntu/fastnetmon?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.2.8-1build1

1.2.8-1build2

1.2.8+git20250911-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.2.8+git20250911-1",
            "binary_name": "fastnetmon"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48682.json"

Ubuntu:Pro:26.04:LTS / fastnetmon

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.2.8+git20250911-1

1.2.8+git20250911-1build1

1.2.8+git20250911-1build2

1.2.8+git20250911-2

1.2.8+git20250911-2ubuntu0.1~esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.2.8+git20250911-2ubuntu0.1~esm1",
            "binary_name": "fastnetmon"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48682.json"