UBUNTU-CVE-2026-55568

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Source
https://ubuntu.com/security/CVE-2026-55568
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55568.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-55568
Upstream
Published
2026-06-23T16:17:00Z
Modified
2026-06-25T19:19:15.969379089Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Guzzle is an extensible PHP HTTP client. Prior to 7.12.1, in certain configurations, traffic expected to be protected by TLS on the hop to the proxy is transmitted in cleartext. Proxy authentication credentials (the Proxy-Authorization header, proxy userinfo in the proxy URL, or CURLOPT_PROXYUSERPWD) are sent without encryption, and the CONNECT target host and port for tunneled HTTPS requests are exposed. The built-in cURL handlers (GuzzleHttp\Handler\CurlHandler and GuzzleHttp\Handler\CurlMultiHandler, used by default whenever the PHP cURL extension is available) accept an https:// proxy. libcurl older than 7.50.2 silently treats an https:// proxy as a plaintext http:// proxy. The TLS connection to the proxy is never established, and the proxy leg is cleartext with no error or warning. An application is affected when it sends requests through one of the built-in cURL handlers, configures an https:// proxy expecting the proxy connection itself to be encrypted, and runs with libcurl older than 7.50.2. This vulnerability is fixed in 7.12.1.

References

Affected packages

Ubuntu:24.04:LTS / guzzle

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

7.*
7.4.5-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "php-guzzlehttp-guzzle",
            "binary_version": "7.4.5-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55568.json"

Ubuntu:25.10 / guzzle

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

7.*
7.9.2-0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "php-guzzlehttp-guzzle",
            "binary_version": "7.9.2-0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55568.json"

Ubuntu:26.04:LTS / guzzle

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

7.*
7.9.2-0.1
7.9.2-0.1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "php-guzzlehttp-guzzle",
            "binary_version": "7.9.2-0.1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55568.json"