UBUNTU-CVE-2026-56820

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Source

https://ubuntu.com/security/CVE-2026-56820

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56820.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-56820

Upstream

CVE-2026-56820

Published

2026-07-21T23:17:00Z

Modified

2026-07-29T10:18:19.627861583Z

Severity

7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and prior to 4.1.135.Final, OcspClient does not validate that the CertificateID in an OCSP response matches the requested CertificateID, which can lead to replay attack. OcspClient.validateResponse accepts a legitimately signed GOOD status response for an unrelated certificate issued by the same CA, allowing bypass of revocation checks for another certificate. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

References

Affected packages

Ubuntu:Pro:14.04:LTS

netty

Package

Name: netty
Purl: pkg:deb/ubuntu/netty?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1:3.*

1:3.2.6.Final-2

1:3.2.6.Final-2+deb8u2build0.14.04.1~esm1

1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1",
            "binary_name": "libnetty-java"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56820.json"

Ubuntu:Pro:16.04:LTS

netty

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1:3.*

1:3.2.6.Final-2

1:4.*

1:4.0.32-1

1:4.0.33-1

1:4.0.34-1

1:4.0.34-1ubuntu0.1~esm1

1:4.0.34-1ubuntu0.1~esm2

1:4.0.34-1ubuntu0.1~esm3

1:4.0.34-1ubuntu0.1~esm4

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1:4.0.34-1ubuntu0.1~esm4",
            "binary_name": "libnetty-java"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56820.json"

Ubuntu:Pro:18.04:LTS

netty

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1:4.*

1:4.1.7-4

1:4.1.7-4ubuntu0.1~esm1

1:4.1.7-4ubuntu0.1

1:4.1.7-4ubuntu0.1+esm1

1:4.1.7-4ubuntu0.1+esm2

1:4.1.7-4ubuntu0.1+esm3

1:4.1.7-4ubuntu0.1+esm4

1:4.1.7-4ubuntu0.1+esm5

1:4.1.7-4ubuntu0.1+esm6

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1:4.1.7-4ubuntu0.1+esm6",
            "binary_name": "libnetty-java"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56820.json"

Ubuntu:Pro:20.04:LTS

netty

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1:4.*

1:4.1.33-1

1:4.1.33-2

1:4.1.33-3

1:4.1.45-1

1:4.1.45-1ubuntu0.1~esm1

1:4.1.45-1ubuntu0.1~esm2

1:4.1.45-1ubuntu0.1~esm3

1:4.1.45-1ubuntu0.1~esm4

1:4.1.45-1ubuntu0.1~esm6

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1:4.1.45-1ubuntu0.1~esm6",
            "binary_name": "libnetty-java"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56820.json"

Ubuntu:Pro:22.04:LTS

netty

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1:4.*

1:4.1.48-4

1:4.1.48-4+deb11u1build0.22.04.1

1:4.1.48-4+deb11u2build0.22.04.1

1:4.1.48-4+deb11u2ubuntu0.1~esm1

1:4.1.48-4+deb11u2ubuntu0.1~esm2

1:4.1.48-4+deb11u2ubuntu0.1

1:4.1.48-4+deb11u2ubuntu0.1+esm1

1:4.1.48-4+deb11u2ubuntu0.1+esm3

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1:4.1.48-4+deb11u2ubuntu0.1+esm3",
            "binary_name": "libnetty-java"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56820.json"

Ubuntu:Pro:24.04:LTS

netty

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1:4.*

1:4.1.48-7

1:4.1.48-8

1:4.1.48-9

1:4.1.48-9ubuntu0.1~esm1

1:4.1.48-9ubuntu0.1~esm2

1:4.1.48-9ubuntu0.1

1:4.1.48-9ubuntu0.1+esm1

1:4.1.48-9ubuntu0.1+esm3

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1:4.1.48-9ubuntu0.1+esm3",
            "binary_name": "libnetty-java"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56820.json"

Ubuntu:Pro:26.04:LTS

netty

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1:4.*

1:4.1.48-10

1:4.1.48-11

1:4.1.48-12

1:4.1.48-13

1:4.1.48-14

1:4.1.48-16

1:4.1.48-16ubuntu0.1~esm2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1:4.1.48-16ubuntu0.1~esm2",
            "binary_name": "libnetty-buffer-java"
        },
        {
            "binary_version": "1:4.1.48-16ubuntu0.1~esm2",
            "binary_name": "libnetty-common-java"
        },
        {
            "binary_version": "1:4.1.48-16ubuntu0.1~esm2",
            "binary_name": "libnetty-java"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56820.json"