UBUNTU-CVE-2026-93304

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Source
https://ubuntu.com/security/CVE-2026-93304
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93304.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-93304
Upstream
Published
2026-09-29T00:00:00Z
Modified
2026-09-29T23:42:30Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A (D)TLS 1.2 client can accept a ChangeCipherSpec message before it has sent its ClientKeyExchange. No master secret has been derived at that point, so the client installs read keys derived from a known (deterministic) key and checks the server's Finished against that same key. An out-of-order ChangeCipherSpec can therefore be used by an attacker to complete the handshake in place of the server and send data the client accepts as authentic. The client's own traffic still uses correctly derived keys, so the attacker cannot read it, and the genuine server never completes the handshake. DTLS 1.2 clients are exposed because a datagram read can deliver the out-of-order records on its own. TLS 1.2 clients are exposed when the application supplies received bytes with wolfSSL_inject() or enables read ahead. For certificate suites, the attacker must be in a man-in-the-middle position. For PSK (Pre Shared Key) connections, any fake server can succeed without knowing the PSK.

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
0 Unknown 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-2026-93304.json"
Ubuntu:18.04:LTS
wolfssl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-93304.json"
Ubuntu:20.04:LTS
wolfssl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-93304.json"
Ubuntu:22.04:LTS
wolfssl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-93304.json"
Ubuntu:24.04:LTS
wolfssl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-93304.json"
Ubuntu:26.04:LTS
wolfssl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-93304.json"