UBUNTU-CVE-2026-6091

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Source

https://ubuntu.com/security/CVE-2026-6091

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6091.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-6091

Upstream

CVE-2026-6091

Published

2026-06-25T18:16:00Z

Modified

2026-06-29T23:19:16.974213199Z

Severity

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

Summary

[none]

Details

Partial-chain certificate verification may accept chains that terminate at a peer-supplied, untrusted intermediate certificate rather than a trusted anchor. An attacker could present a chain that ends at an intermediate they control and have it accepted as valid. This affects the OpenSSL compatibility certificate-path-building path (wolfSSLX509verifycert / X509STORE, OPENSSLEXTRA) when the X509VFLAGPARTIAL_CHAIN verify flag is enabled.

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

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6091.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_version": "3.13.0+dfsg-1",
            "binary_name": "libwolfssl15"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6091.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_version": "4.3.0+dfsg-2",
            "binary_name": "libwolfssl24"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6091.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_version": "5.2.0-2",
            "binary_name": "libwolfssl32"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6091.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_version": "5.6.6-1.3build1",
            "binary_name": "libwolfssl42t64"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6091.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_version": "5.7.2-0.1",
            "binary_name": "libwolfssl42t64"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6091.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_version": "5.9.1-0.1",
            "binary_name": "libwolfssl44"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6091.json"