UBUNTU-CVE-2026-29013

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Source
https://ubuntu.com/security/CVE-2026-29013
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29013.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-29013
Upstream
  • CVE-2026-29013
Published
2026-04-17T22:16:00Z
Modified
2026-06-04T12:45:25.894906669Z
Severity
  • 8.8 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • 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
  • Ubuntu - medium
Summary
[none]
Details

libcoap contains out-of-bounds read vulnerabilities in OSCORE Appendix B.2 CBOR unwrap handling where getbyteinc() in src/oscore/oscore_cbor.c relies solely on assert() for bounds checking, which is removed in release builds compiled with NDEBUG. Attackers can send crafted CoAP requests with malformed OSCORE options or responses during OSCORE negotiation to trigger out-of-bounds reads during CBOR parsing and potentially cause out-of-bounds reads through integer wraparound in allocation size computation.

References

Affected packages

Ubuntu:18.04:LTS
libcoap

Package

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

Affected ranges

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

Affected versions

4.*
4.1.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libcoap-1-0",
            "binary_version": "4.1.2-1"
        },
        {
            "binary_name": "libcoap-1-0-bin",
            "binary_version": "4.1.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29013.json"
Ubuntu:20.04:LTS
libcoap2

Package

Name
libcoap2
Purl
pkg:deb/ubuntu/libcoap2?arch=source&distro=focal

Affected ranges

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

Affected versions

4.*
4.2.0-2
4.2.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libcoap2",
            "binary_version": "4.2.1-1"
        },
        {
            "binary_name": "libcoap2-bin",
            "binary_version": "4.2.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29013.json"
Ubuntu:22.04:LTS
libcoap2

Package

Name
libcoap2
Purl
pkg:deb/ubuntu/libcoap2?arch=source&distro=jammy

Affected ranges

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

Affected versions

4.*
4.2.1-1
4.2.1-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libcoap2",
            "binary_version": "4.2.1-1build1"
        },
        {
            "binary_name": "libcoap2-bin",
            "binary_version": "4.2.1-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29013.json"
libcoap3

Package

Name
libcoap3
Purl
pkg:deb/ubuntu/libcoap3?arch=source&distro=jammy

Affected ranges

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

Affected versions

4.*
4.3.0-2
4.3.0-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libcoap3",
            "binary_version": "4.3.0-2build1"
        },
        {
            "binary_name": "libcoap3-bin",
            "binary_version": "4.3.0-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29013.json"
Ubuntu:24.04:LTS
libcoap3

Package

Name
libcoap3
Purl
pkg:deb/ubuntu/libcoap3?arch=source&distro=noble

Affected ranges

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

Affected versions

4.*
4.3.1-2
4.3.3-1
4.3.4-1
4.3.4-1.1build2
4.3.4-1.1build3
4.3.4-1.1build4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libcoap3-bin",
            "binary_version": "4.3.4-1.1build4"
        },
        {
            "binary_name": "libcoap3t64",
            "binary_version": "4.3.4-1.1build4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29013.json"
Ubuntu:25.10
libcoap3

Package

Name
libcoap3
Purl
pkg:deb/ubuntu/libcoap3?arch=source&distro=questing

Affected ranges

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

Affected versions

4.*
4.3.4-1.1build4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libcoap3-bin",
            "binary_version": "4.3.4-1.1build4"
        },
        {
            "binary_name": "libcoap3t64",
            "binary_version": "4.3.4-1.1build4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29013.json"
Ubuntu:26.04:LTS
libcoap3

Package

Name
libcoap3
Purl
pkg:deb/ubuntu/libcoap3?arch=source&distro=resolute

Affected ranges

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

Affected versions

4.*
4.3.4-1.1build4
4.3.5-1
4.3.5-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libcoap3-bin",
            "binary_version": "4.3.5-2"
        },
        {
            "binary_name": "libcoap3t64",
            "binary_version": "4.3.5-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29013.json"