UBUNTU-CVE-2026-56786

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Source
https://ubuntu.com/security/CVE-2026-56786
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56786.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-56786
Upstream
  • CVE-2026-56786
Published
2026-06-25T19:16:00Z
Modified
2026-06-29T23:19:15.872875276Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

RTKLIB through 2.4.3 contains an out-of-bounds write vulnerability in decodetype1033 function that fails to clamp length counters to destination buffer size, allowing up to 191-byte overflow into fixed 64-byte descriptor fields. An attacker controlling an NTRIP or serial RTCM3 correction stream can craft a valid CRC-bearing type-1033 message to corrupt adjacent rtcmt object members, potentially achieving arbitrary code execution or denial of service.

References

Affected packages

Ubuntu:18.04:LTS
rtklib

Package

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

Affected ranges

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

Affected versions

2.*
2.4.3+dfsg1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "rtklib",
            "binary_version": "2.4.3+dfsg1-1"
        },
        {
            "binary_name": "rtklib-qt",
            "binary_version": "2.4.3+dfsg1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56786.json"
Ubuntu:20.04:LTS
rtklib

Package

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

Affected ranges

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

Affected versions

2.*
2.4.3+dfsg1-1
2.4.3+dfsg1-2.1
2.4.3+dfsg1-2.1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "rtklib",
            "binary_version": "2.4.3+dfsg1-2.1build1"
        },
        {
            "binary_name": "rtklib-qt",
            "binary_version": "2.4.3+dfsg1-2.1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56786.json"
Ubuntu:22.04:LTS
rtklib

Package

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

Affected ranges

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

Affected versions

2.*
2.4.3+dfsg1-2.1build1
2.4.3.b34+dfsg-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "librtklib1",
            "binary_version": "2.4.3.b34+dfsg-1"
        },
        {
            "binary_name": "rtklib",
            "binary_version": "2.4.3.b34+dfsg-1"
        },
        {
            "binary_name": "rtklib-qt",
            "binary_version": "2.4.3.b34+dfsg-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56786.json"
Ubuntu:24.04:LTS
rtklib

Package

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

Affected ranges

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

Affected versions

2.*
2.4.3.b34+dfsg-1
2.4.3.b34+dfsg-1build1
2.4.3.b34+dfsg-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "librtklib1",
            "binary_version": "2.4.3.b34+dfsg-1build2"
        },
        {
            "binary_name": "rtklib",
            "binary_version": "2.4.3.b34+dfsg-1build2"
        },
        {
            "binary_name": "rtklib-qt",
            "binary_version": "2.4.3.b34+dfsg-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56786.json"
Ubuntu:25.10
rtklib

Package

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

Affected ranges

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

Affected versions

2.*
2.4.3.b34+dfsg-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "librtklib1",
            "binary_version": "2.4.3.b34+dfsg-1build2"
        },
        {
            "binary_name": "rtklib",
            "binary_version": "2.4.3.b34+dfsg-1build2"
        },
        {
            "binary_name": "rtklib-qt",
            "binary_version": "2.4.3.b34+dfsg-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56786.json"
Ubuntu:26.04:LTS
rtklib

Package

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

Affected ranges

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

Affected versions

2.*
2.4.3.b34+dfsg-1build2
2.4.3.b34+dfsg-1build3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "librtklib1",
            "binary_version": "2.4.3.b34+dfsg-1build3"
        },
        {
            "binary_name": "rtklib",
            "binary_version": "2.4.3.b34+dfsg-1build3"
        },
        {
            "binary_name": "rtklib-qt",
            "binary_version": "2.4.3.b34+dfsg-1build3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56786.json"