USN-8300-1

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Source
https://ubuntu.com/security/notices/USN-8300-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8300-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8300-1
Upstream
Related
Published
2026-05-25T10:58:24Z
Modified
2026-06-30T18:16:25.402270673Z
Summary
ngtcp2 vulnerability
Details

Zou Dikai discovered that ngtcp2 serialized peer transport parameters into a fixed 1024-byte stack buffer without bounds checking. When qlog was enabled, a remote attacker could possibly use this issue to execute arbitrary code.

References

Affected packages

Ubuntu:Pro:22.04:LTS / ngtcp2

Package

Name
ngtcp2
Purl
pkg:deb/ubuntu/ngtcp2?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.1.0+dfsg-1ubuntu0.1~esm1

Affected versions

Other
0~20210905-1
0.*
0.1.0+dfsg-1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libngtcp2-0",
            "binary_version": "0.1.0+dfsg-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "libngtcp2-crypto-gnutls0",
            "binary_version": "0.1.0+dfsg-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "ngtcp2-client",
            "binary_version": "0.1.0+dfsg-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "ngtcp2-server",
            "binary_version": "0.1.0+dfsg-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-40170",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:22.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8300-1.json"

Ubuntu:24.04:LTS / ngtcp2

Package

Name
ngtcp2
Purl
pkg:deb/ubuntu/ngtcp2?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.12.1+dfsg-1+deb12u1build0.24.04.1

Affected versions

0.*
0.12.1+dfsg-1
0.12.1+dfsg-1build1
0.12.1+dfsg-1build2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libngtcp2-9",
            "binary_version": "0.12.1+dfsg-1+deb12u1build0.24.04.1"
        },
        {
            "binary_name": "libngtcp2-crypto-gnutls2",
            "binary_version": "0.12.1+dfsg-1+deb12u1build0.24.04.1"
        },
        {
            "binary_name": "ngtcp2-client",
            "binary_version": "0.12.1+dfsg-1+deb12u1build0.24.04.1"
        },
        {
            "binary_name": "ngtcp2-server",
            "binary_version": "0.12.1+dfsg-1+deb12u1build0.24.04.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-40170",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8300-1.json"

Ubuntu:25.10 / ngtcp2

Package

Name
ngtcp2
Purl
pkg:deb/ubuntu/ngtcp2?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.11.0-1+deb13u1build0.25.10.1

Affected versions

1.*
1.11.0-1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libngtcp2-16",
            "binary_version": "1.11.0-1+deb13u1build0.25.10.1"
        },
        {
            "binary_name": "libngtcp2-crypto-gnutls8",
            "binary_version": "1.11.0-1+deb13u1build0.25.10.1"
        },
        {
            "binary_name": "ngtcp2-client",
            "binary_version": "1.11.0-1+deb13u1build0.25.10.1"
        },
        {
            "binary_name": "ngtcp2-server",
            "binary_version": "1.11.0-1+deb13u1build0.25.10.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-40170",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:25.10"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8300-1.json"

Ubuntu:26.04:LTS / ngtcp2

Package

Name
ngtcp2
Purl
pkg:deb/ubuntu/ngtcp2?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.16.0-1ubuntu0.1

Affected versions

1.*
1.11.0-1
1.16.0-1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libngtcp2-16",
            "binary_version": "1.16.0-1ubuntu0.1"
        },
        {
            "binary_name": "libngtcp2-crypto-gnutls8",
            "binary_version": "1.16.0-1ubuntu0.1"
        },
        {
            "binary_name": "libngtcp2-crypto-ossl0",
            "binary_version": "1.16.0-1ubuntu0.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-40170",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:26.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8300-1.json"