UBUNTU-CVE-2026-88647

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Source

https://ubuntu.com/security/CVE-2026-88647

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88647.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-88647

Upstream

CVE-2026-88647

Published

2026-10-13T00:00:00Z

Modified

2026-10-14T03:23:35Z

Severity

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

Summary

[none]

Details

A hostname verification bypass in GnuTLS v3.8.13 allows attackers to circumvent the Common Name fallback mechanism and eavesdrop on communications via a crafted certificate.

References

Affected packages

Ubuntu:22.04:LTS

gnutls28

Package

Name: gnutls28
Purl: pkg:deb/ubuntu/gnutls28?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.7.1-5ubuntu1

3.7.2-2ubuntu1

3.7.2-4ubuntu1

3.7.2-5ubuntu1

3.7.3-4ubuntu1

3.7.3-4ubuntu1.1

3.7.3-4ubuntu1.2

3.7.3-4ubuntu1.3

3.7.3-4ubuntu1.4

3.7.3-4ubuntu1.5

3.7.3-4ubuntu1.6

3.7.3-4ubuntu1.7

3.7.3-4ubuntu1.8

3.7.3-4ubuntu1.9

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "gnutls-bin",
            "binary_version":  "3.7.3-4ubuntu1.9"
        },
        {
            "binary_name":  "guile-gnutls",
            "binary_version":  "3.7.3-4ubuntu1.9"
        },
        {
            "binary_name":  "libgnutls-dane0",
            "binary_version":  "3.7.3-4ubuntu1.9"
        },
        {
            "binary_name":  "libgnutls-openssl27",
            "binary_version":  "3.7.3-4ubuntu1.9"
        },
        {
            "binary_name":  "libgnutls30",
            "binary_version":  "3.7.3-4ubuntu1.9"
        },
        {
            "binary_name":  "libgnutlsxx28",
            "binary_version":  "3.7.3-4ubuntu1.9"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88647.json"

Ubuntu:24.04:LTS

gnutls28

Package

Name: gnutls28
Purl: pkg:deb/ubuntu/gnutls28?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.8.1-4ubuntu1

3.8.1-4ubuntu6

3.8.1-4ubuntu7

3.8.3-1ubuntu1

3.8.3-1.1ubuntu2

3.8.3-1.1ubuntu3

3.8.3-1.1ubuntu3.1

3.8.3-1.1ubuntu3.2

3.8.3-1.1ubuntu3.3

3.8.3-1.1ubuntu3.4

3.8.3-1.1ubuntu3.5

3.8.3-1.1ubuntu3.6

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "gnutls-bin",
            "binary_version":  "3.8.3-1.1ubuntu3.6"
        },
        {
            "binary_name":  "libgnutls-dane0t64",
            "binary_version":  "3.8.3-1.1ubuntu3.6"
        },
        {
            "binary_name":  "libgnutls-openssl27t64",
            "binary_version":  "3.8.3-1.1ubuntu3.6"
        },
        {
            "binary_name":  "libgnutls30t64",
            "binary_version":  "3.8.3-1.1ubuntu3.6"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88647.json"

Ubuntu:26.04:LTS

gnutls28

Package

Name: gnutls28
Purl: pkg:deb/ubuntu/gnutls28?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.8.9-3ubuntu2

3.8.10-3ubuntu1

3.8.12-2ubuntu1

3.8.12-2ubuntu1.1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "gnutls-bin",
            "binary_version":  "3.8.12-2ubuntu1.1"
        },
        {
            "binary_name":  "libgnutls-dane0t64",
            "binary_version":  "3.8.12-2ubuntu1.1"
        },
        {
            "binary_name":  "libgnutls-openssl27t64",
            "binary_version":  "3.8.12-2ubuntu1.1"
        },
        {
            "binary_name":  "libgnutls30t64",
            "binary_version":  "3.8.12-2ubuntu1.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88647.json"

Ubuntu:Pro:14.04:LTS

gnutls26

Package

Name: gnutls26
Purl: pkg:deb/ubuntu/gnutls26?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.12.23-1ubuntu4

2.12.23-1ubuntu5

2.12.23-12ubuntu1

2.12.23-12ubuntu2

2.12.23-12ubuntu2.1

2.12.23-12ubuntu2.2

2.12.23-12ubuntu2.3

2.12.23-12ubuntu2.4

2.12.23-12ubuntu2.5

2.12.23-12ubuntu2.6

2.12.23-12ubuntu2.7

2.12.23-12ubuntu2.8

2.12.23-12ubuntu2.10+esm1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "gnutls-bin",
            "binary_version":  "3.0.11+really2.12.23-12ubuntu2.10+esm1"
        },
        {
            "binary_name":  "libgnutls-openssl27",
            "binary_version":  "2.12.23-12ubuntu2.10+esm1"
        },
        {
            "binary_name":  "libgnutls26",
            "binary_version":  "2.12.23-12ubuntu2.10+esm1"
        },
        {
            "binary_name":  "libgnutlsxx27",
            "binary_version":  "2.12.23-12ubuntu2.10+esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88647.json"

Ubuntu:Pro:16.04:LTS

gnutls28

Package

Name: gnutls28
Purl: pkg:deb/ubuntu/gnutls28?arch=source&distro=esm-infra-legacy%2Fxenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.3.15-5ubuntu2

3.3.18-1ubuntu1

3.3.20-1ubuntu1

3.4.9-2ubuntu1

3.4.10-4ubuntu1

3.4.10-4ubuntu1.1

3.4.10-4ubuntu1.2

3.4.10-4ubuntu1.3

3.4.10-4ubuntu1.4

3.4.10-4ubuntu1.5

3.4.10-4ubuntu1.6

3.4.10-4ubuntu1.7

3.4.10-4ubuntu1.8

3.4.10-4ubuntu1.9

3.4.10-4ubuntu1.9+esm1

3.4.10-4ubuntu1.9+esm2

3.4.10-4ubuntu1.9+esm3

3.4.10-4ubuntu1.9+esm4

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "gnutls-bin",
            "binary_version":  "3.4.10-4ubuntu1.9+esm4"
        },
        {
            "binary_name":  "guile-gnutls",
            "binary_version":  "3.4.10-4ubuntu1.9+esm4"
        },
        {
            "binary_name":  "libgnutls-openssl27",
            "binary_version":  "3.4.10-4ubuntu1.9+esm4"
        },
        {
            "binary_name":  "libgnutls30",
            "binary_version":  "3.4.10-4ubuntu1.9+esm4"
        },
        {
            "binary_name":  "libgnutlsxx28",
            "binary_version":  "3.4.10-4ubuntu1.9+esm4"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88647.json"

Ubuntu:Pro:18.04:LTS

gnutls28

Package

Name: gnutls28
Purl: pkg:deb/ubuntu/gnutls28?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.5.8-6ubuntu3

3.5.17-1ubuntu1

3.5.17-1ubuntu3

3.5.18-1ubuntu1

3.5.18-1ubuntu1.1

3.5.18-1ubuntu1.2

3.5.18-1ubuntu1.3

3.5.18-1ubuntu1.4

3.5.18-1ubuntu1.5

3.5.18-1ubuntu1.6

3.5.18-1ubuntu1.6+esm1

3.5.18-1ubuntu1.6+esm2

3.5.18-1ubuntu1.6+esm3

3.5.18-1ubuntu1.6+esm4

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "gnutls-bin",
            "binary_version":  "3.5.18-1ubuntu1.6+esm4"
        },
        {
            "binary_name":  "libgnutls-dane0",
            "binary_version":  "3.5.18-1ubuntu1.6+esm4"
        },
        {
            "binary_name":  "libgnutls-openssl27",
            "binary_version":  "3.5.18-1ubuntu1.6+esm4"
        },
        {
            "binary_name":  "libgnutls30",
            "binary_version":  "3.5.18-1ubuntu1.6+esm4"
        },
        {
            "binary_name":  "libgnutlsxx28",
            "binary_version":  "3.5.18-1ubuntu1.6+esm4"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88647.json"

Ubuntu:Pro:20.04:LTS

gnutls28

Package

Name: gnutls28
Purl: pkg:deb/ubuntu/gnutls28?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.6.9-5ubuntu1

3.6.9-5ubuntu2

3.6.10-5

3.6.11.1-2

3.6.11.1-2ubuntu2

3.6.13-2ubuntu1

3.6.13-2ubuntu1.1

3.6.13-2ubuntu1.2

3.6.13-2ubuntu1.3

3.6.13-2ubuntu1.6

3.6.13-2ubuntu1.7

3.6.13-2ubuntu1.8

3.6.13-2ubuntu1.9

3.6.13-2ubuntu1.10

3.6.13-2ubuntu1.11

3.6.13-2ubuntu1.12

3.6.13-2ubuntu1.12+esm1

3.6.13-2ubuntu1.12+esm2

3.6.13-2ubuntu1.12+esm3

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "gnutls-bin",
            "binary_version":  "3.6.13-2ubuntu1.12+esm3"
        },
        {
            "binary_name":  "guile-gnutls",
            "binary_version":  "3.6.13-2ubuntu1.12+esm3"
        },
        {
            "binary_name":  "libgnutls-dane0",
            "binary_version":  "3.6.13-2ubuntu1.12+esm3"
        },
        {
            "binary_name":  "libgnutls-openssl27",
            "binary_version":  "3.6.13-2ubuntu1.12+esm3"
        },
        {
            "binary_name":  "libgnutls30",
            "binary_version":  "3.6.13-2ubuntu1.12+esm3"
        },
        {
            "binary_name":  "libgnutlsxx28",
            "binary_version":  "3.6.13-2ubuntu1.12+esm3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88647.json"

Ubuntu:Pro:FIPS-preview:22.04:LTS

gnutls28

Package

Name: gnutls28
Purl: pkg:deb/ubuntu/gnutls28?arch=source&distro=fips-preview%2Fjammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.7.3-4ubuntu1.2+Fips1.1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "gnutls-bin",
            "binary_version":  "3.7.3-4ubuntu1.2+Fips1.1"
        },
        {
            "binary_name":  "guile-gnutls",
            "binary_version":  "3.7.3-4ubuntu1.2+Fips1.1"
        },
        {
            "binary_name":  "libgnutls-dane0",
            "binary_version":  "3.7.3-4ubuntu1.2+Fips1.1"
        },
        {
            "binary_name":  "libgnutls-openssl27",
            "binary_version":  "3.7.3-4ubuntu1.2+Fips1.1"
        },
        {
            "binary_name":  "libgnutls30",
            "binary_version":  "3.7.3-4ubuntu1.2+Fips1.1"
        },
        {
            "binary_name":  "libgnutlsxx28",
            "binary_version":  "3.7.3-4ubuntu1.2+Fips1.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88647.json"

Ubuntu:Pro:FIPS-updates:22.04:LTS

gnutls28

Package

Name: gnutls28
Purl: pkg:deb/ubuntu/gnutls28?arch=source&distro=fips-updates%2Fjammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.7.3-4ubuntu1.2+Fips1.1

3.7.3-4ubuntu1.3+Fips1.1

3.7.3-4ubuntu1.4+Fips1

3.7.3-4ubuntu1.5+Fips1

3.7.3-4ubuntu1.6+Fips1

3.7.3-4ubuntu1.7+Fips1

3.7.3-4ubuntu1.7+Fips1.1

3.7.3-4ubuntu1.8+Fips1.1

3.7.3-4ubuntu1.9+Fips1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "gnutls-bin",
            "binary_version":  "3.7.3-4ubuntu1.9+Fips1"
        },
        {
            "binary_name":  "guile-gnutls",
            "binary_version":  "3.7.3-4ubuntu1.9+Fips1"
        },
        {
            "binary_name":  "libgnutls-dane0",
            "binary_version":  "3.7.3-4ubuntu1.9+Fips1"
        },
        {
            "binary_name":  "libgnutls-openssl27",
            "binary_version":  "3.7.3-4ubuntu1.9+Fips1"
        },
        {
            "binary_name":  "libgnutls30",
            "binary_version":  "3.7.3-4ubuntu1.9+Fips1"
        },
        {
            "binary_name":  "libgnutlsxx28",
            "binary_version":  "3.7.3-4ubuntu1.9+Fips1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88647.json"

Ubuntu:Pro:FIPS-updates:24.04:LTS

gnutls28

Package

Name: gnutls28
Purl: pkg:deb/ubuntu/gnutls28?arch=source&distro=fips-updates%2Fnoble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.8.3-1.1ubuntu3.1+Fips1

3.8.3-1.1ubuntu3.4+Fips1

3.8.3-1.1ubuntu3.4+Fips1.1

3.8.3-1.1ubuntu3.5+Fips1.1

3.8.3-1.1ubuntu3.6+Fips1.2

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "gnutls-bin",
            "binary_version":  "3.8.3-1.1ubuntu3.6+Fips1.2"
        },
        {
            "binary_name":  "libgnutls-dane0t64",
            "binary_version":  "3.8.3-1.1ubuntu3.6+Fips1.2"
        },
        {
            "binary_name":  "libgnutls-openssl27t64",
            "binary_version":  "3.8.3-1.1ubuntu3.6+Fips1.2"
        },
        {
            "binary_name":  "libgnutls30t64",
            "binary_version":  "3.8.3-1.1ubuntu3.6+Fips1.2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88647.json"