UBUNTU-CVE-2026-8720

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Source

https://ubuntu.com/security/CVE-2026-8720

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8720.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-8720

Upstream

CVE-2026-8720

Published

2026-06-25T22:17:00Z

Modified

2026-06-29T23:19:16.768181339Z

Severity

5.9 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

wcBlake2bHmacFinal and wcBlake2sHmacFinal discard the message when the key length exceeds the block size, producing a MAC that is independent of the input. When the supplied key is longer than the BLAKE2 block size the key-hashing branch reinitialized the running hash state, discarding the accumulated message data, so the resulting MAC depended only on the key and not on the message being authenticated. This bug is specific to the HMAC-BLAKE2 APIs that were added in wolfSSL version 5.9.0.

References

Affected packages

Ubuntu:16.04:LTS

wolfssl

Package

Name: wolfssl
Purl: pkg:deb/ubuntu/wolfssl?arch=source&distro=xenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.4.8+dfsg-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libcyassl5",
            "binary_version": "3.4.8+dfsg-1"
        },
        {
            "binary_name": "libwolfssl0",
            "binary_version": "3.4.8+dfsg-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8720.json"

Ubuntu:18.04:LTS

wolfssl

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.10.2+dfsg-2

3.12.0+dfsg-1

3.12.2+dfsg-1

3.13.0+dfsg-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libwolfssl15",
            "binary_version": "3.13.0+dfsg-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8720.json"

Ubuntu:20.04:LTS

wolfssl

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.1.0+dfsg-2

4.2.0+dfsg-1

4.2.0+dfsg-2

4.2.0+dfsg-3

4.3.0+dfsg-2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libwolfssl24",
            "binary_version": "4.3.0+dfsg-2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8720.json"

Ubuntu:22.04:LTS

wolfssl

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.6.0-3

5.*

5.0.0-1

5.1.1-1

5.2.0-1

5.2.0-2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libwolfssl32",
            "binary_version": "5.2.0-2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8720.json"

Ubuntu:24.04:LTS

wolfssl

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

5.*

5.5.4-2

5.5.4-2.1

5.6.4-2

5.6.6-1.2

5.6.6-1.3

5.6.6-1.3build1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libwolfssl42t64",
            "binary_version": "5.6.6-1.3build1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8720.json"

Ubuntu:25.10

wolfssl

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

5.*

5.7.2-0.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libwolfssl42t64",
            "binary_version": "5.7.2-0.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8720.json"

Ubuntu:26.04:LTS

wolfssl

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

5.*

5.7.2-0.1

5.8.2-1.2

5.8.4-1

5.9.1-0.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libwolfssl44",
            "binary_version": "5.9.1-0.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8720.json"