UBUNTU-CVE-2026-18798

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Source
https://ubuntu.com/security/CVE-2026-18798
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18798.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-18798
Upstream
Downstream
Related
Published
2026-08-25T00:00:00Z
Modified
2026-08-27T16:58:32.699550425Z
Severity
  • 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
  • Ubuntu - medium
Summary
[none]
Details

QUIC Server May Trigger Double Free When Processing INITIAL Packet

References

Affected packages

Ubuntu:26.04:LTS
edk2

Package

Name
edk2
Purl
pkg:deb/ubuntu/edk2?arch=source&distro=resolute

Affected ranges

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

Affected versions

2025.*
2025.02-8ubuntu3
2025.11-3ubuntu6
2025.11-3ubuntu7

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "efi-shell-aa64"
        },
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "efi-shell-loongarch64"
        },
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "efi-shell-riscv64"
        },
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "efi-shell-x64"
        },
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "ovmf"
        },
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "ovmf-amdsev"
        },
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "ovmf-generic"
        },
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "ovmf-inteltdx"
        },
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "ovmf-legacy"
        },
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "qemu-efi-aarch64"
        },
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "qemu-efi-loongarch64"
        },
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "qemu-efi-riscv64"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18798.json"
edk2-hwe

Package

Name
edk2-hwe
Purl
pkg:deb/ubuntu/edk2-hwe?arch=source&distro=resolute

Affected ranges

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

Affected versions

2025.*
2025.11-3ubuntu6
2025.11-3ubuntu8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2025.11-3ubuntu8",
            "binary_name": "efi-shell-aa64-hwe"
        },
        {
            "binary_version": "2025.11-3ubuntu8",
            "binary_name": "efi-shell-loongarch64-hwe"
        },
        {
            "binary_version": "2025.11-3ubuntu8",
            "binary_name": "efi-shell-riscv64-hwe"
        },
        {
            "binary_version": "2025.11-3ubuntu8",
            "binary_name": "efi-shell-x64-hwe"
        },
        {
            "binary_version": "2025.11-3ubuntu8",
            "binary_name": "ovmf-amdsev-hwe"
        },
        {
            "binary_version": "2025.11-3ubuntu8",
            "binary_name": "ovmf-generic-hwe"
        },
        {
            "binary_version": "2025.11-3ubuntu8",
            "binary_name": "ovmf-hwe"
        },
        {
            "binary_version": "2025.11-3ubuntu8",
            "binary_name": "ovmf-inteltdx-hwe"
        },
        {
            "binary_version": "2025.11-3ubuntu8",
            "binary_name": "ovmf-legacy-hwe"
        },
        {
            "binary_version": "2025.11-3ubuntu8",
            "binary_name": "qemu-efi-aarch64-hwe"
        },
        {
            "binary_version": "2025.11-3ubuntu8",
            "binary_name": "qemu-efi-loongarch64-hwe"
        },
        {
            "binary_version": "2025.11-3ubuntu8",
            "binary_name": "qemu-efi-riscv64-hwe"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18798.json"
openssl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.5.5-1ubuntu3.4

Affected versions

3.*
3.5.3-1ubuntu2
3.5.5-1ubuntu1
3.5.5-1ubuntu3
3.5.5-1ubuntu3.2
3.5.5-1ubuntu3.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "3.5.5-1ubuntu3.4",
            "binary_name": "libssl3t64"
        },
        {
            "binary_version": "3.5.5-1ubuntu3.4",
            "binary_name": "openssl"
        },
        {
            "binary_version": "3.5.5-1ubuntu3.4",
            "binary_name": "openssl-provider-legacy"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18798.json"
Ubuntu:Pro:16.04:LTS
nodejs

Package

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

Affected ranges

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

Affected versions

0.*
0.10.25~dfsg2-2ubuntu1
4.*
4.2.2~dfsg-1
4.2.3~dfsg-1
4.2.4~dfsg-1ubuntu1
4.2.4~dfsg-2
4.2.6~dfsg-1ubuntu1
4.2.6~dfsg-1ubuntu4
4.2.6~dfsg-1ubuntu4.1
4.2.6~dfsg-1ubuntu4.2
4.2.6~dfsg-1ubuntu4.2+esm1
4.2.6~dfsg-1ubuntu4.2+esm2
4.2.6~dfsg-1ubuntu4.2+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.2.6~dfsg-1ubuntu4.2+esm3",
            "binary_name": "nodejs"
        },
        {
            "binary_version": "4.2.6~dfsg-1ubuntu4.2+esm3",
            "binary_name": "nodejs-legacy"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18798.json"
Ubuntu:Pro:18.04:LTS
nodejs

Package

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

Affected ranges

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

Affected versions

6.*
6.11.4~dfsg-1ubuntu1
6.11.4~dfsg-1ubuntu2
6.12.0~dfsg-1ubuntu1
6.12.0~dfsg-2ubuntu1
6.12.0~dfsg-2ubuntu2
8.*
8.10.0~dfsg-2
8.10.0~dfsg-2ubuntu0.2
8.10.0~dfsg-2ubuntu0.3
8.10.0~dfsg-2ubuntu0.4
8.10.0~dfsg-2ubuntu0.4+esm1
8.10.0~dfsg-2ubuntu0.4+esm2
8.10.0~dfsg-2ubuntu0.4+esm3
8.10.0~dfsg-2ubuntu0.4+esm4
8.10.0~dfsg-2ubuntu0.4+esm5
8.10.0~dfsg-2ubuntu0.4+esm6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "8.10.0~dfsg-2ubuntu0.4+esm6",
            "binary_name": "nodejs"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18798.json"
Ubuntu:Pro:FIPS-preview:22.04:LTS
openssl-fips

Package

Name
openssl-fips
Purl
pkg:deb/ubuntu/openssl-fips?arch=source&distro=fips-preview%2Fjammy

Affected ranges

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

Affected versions

3.*
3.0.5-0ubuntu0.1+Fips2.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.0.5-0ubuntu0.1+Fips2.1",
            "binary_name": "openssl-fips-module-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18798.json"
Ubuntu:Pro:FIPS-updates:22.04:LTS
openssl-fips

Package

Name
openssl-fips
Purl
pkg:deb/ubuntu/openssl-fips?arch=source&distro=fips-updates%2Fjammy

Affected ranges

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

Affected versions

3.*
3.0.5-0ubuntu0.1+Fips2.1
3.0.5-0ubuntu0.2+Fips1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.0.5-0ubuntu0.2+Fips1",
            "binary_name": "openssl-fips-module-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18798.json"
Ubuntu:Pro:FIPS-updates:24.04:LTS
openssl-fips

Package

Name
openssl-fips
Purl
pkg:deb/ubuntu/openssl-fips?arch=source&distro=fips-updates%2Fnoble

Affected ranges

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

Affected versions

3.*
3.0.13-0ubuntu3+Fips1
3.0.13-0ubuntu3.6+Fips1
3.0.13-0ubuntu3.12+Fips1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.0.13-0ubuntu3.12+Fips1",
            "binary_name": "openssl-fips-module-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18798.json"