UBUNTU-CVE-2026-55958

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Source

https://ubuntu.com/security/CVE-2026-55958

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55958.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-55958

Upstream

CVE-2026-55958

Published

2026-06-25T20:17:00Z

Modified

2026-06-29T23:19:15.058226035Z

Severity

8.3 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/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:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

Out-of-bounds write in the Renesas TSIP TLS 1.3 transcript buffer. In tsipStoreMessage() the capacity check guarding the fixed message bag (MSGBAGSIZE) sets an error code but fails to return, so execution falls through to an XMEMCPY that writes past the end of the buffer once the accumulated TLS 1.3 handshake transcript exceeds MSGBAGSIZE (8 KB), corrupting adjacent heap state and potentially causing a remote denial of service crash. The bag is sized to hold a normal handshake, so this is reached only by an unusually large but valid certificate chain, or by a malicious or man-in-the-middle server sending an oversized handshake message to a client that does not strictly verify the chain. This only affects builds using the Renesas TSIP TLS port (WOLFSSLRENESASTSIPTLS) as a TLS 1.3 client on Renesas MCUs with TSIP hardware enabled, and is rated High within those builds. All other configurations are unaffected.

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-2026-55958.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-2026-55958.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-2026-55958.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-2026-55958.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-2026-55958.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-2026-55958.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-2026-55958.json"