UBUNTU-CVE-2026-56787

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Source
https://ubuntu.com/security/CVE-2026-56787
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56787.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-56787
Upstream
  • CVE-2026-56787
Published
2026-06-25T19:16:00Z
Modified
2026-06-29T23:19:15.855252222Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

RTKLIB through 2.4.3 contains an off-by-one out-of-bounds read vulnerability in the decode_ssr3 function at src/rtcm3.c:1446 that allows remote attackers to trigger a global buffer overflow via crafted RTCM3 SSR messages with attacker-controlled signal mode fields. Remote attackers can exploit this vulnerability by sending malicious SSR correction streams over NTRIP or serial connections to cause denial of service or crash RTKLIB rovers and CORS servers.

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-2026-56787.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-2026-56787.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-2026-56787.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-2026-56787.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-2026-56787.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-2026-56787.json"