DEBIAN-CVE-2026-55568
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.
DEBIAN-CVE-2026-55568
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-55568
guzzle
Source reference: /affected/0/package/name
- Affected versions
- 7.11.0-1
Source reference:
/affected/0/versions7.12.0-1Source reference:
/affected/0/versions7.12.1-1Source reference:
/affected/0/versions7.12.3-1Source reference:
/affected/0/versions7.13.1-1Source reference:
/affected/0/versions7.14.0-1Source reference:
/affected/0/versions7.14.1-1Source reference:
/affected/0/versions7.14.2-1Source reference:
/affected/0/versions7.15.0-1Source reference:
/affected/0/versions7.15.1-1Source reference:
/affected/0/versions7.15.2-1Source reference:
/affected/0/versions7.15.3-1Source reference:
/affected/0/versions7.15.5-1Source reference:
/affected/0/versions7.4.5-1Source reference:
/affected/0/versions7.9.2-0.1Source reference:
/affected/0/versions8.0.1-1Source reference:
/affected/0/versions8.0.2-1Source reference:
/affected/0/versions8.1.0-1Source reference:
/affected/0/versions8.2.0-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
guzzle
Source reference: /affected/1/package/name
- Affected versions
- 7.11.0-1
Source reference:
/affected/1/versions7.12.0-1Source reference:
/affected/1/versions7.12.1-1Source reference:
/affected/1/versions7.12.3-1Source reference:
/affected/1/versions7.13.1-1Source reference:
/affected/1/versions7.14.0-1Source reference:
/affected/1/versions7.14.1-1Source reference:
/affected/1/versions7.14.2-1Source reference:
/affected/1/versions7.15.0-1Source reference:
/affected/1/versions7.15.1-1Source reference:
/affected/1/versions7.15.2-1Source reference:
/affected/1/versions7.15.3-1Source reference:
/affected/1/versions7.15.5-1Source reference:
/affected/1/versions7.9.2-0.1Source reference:
/affected/1/versions8.0.1-1Source reference:
/affected/1/versions8.0.2-1Source reference:
/affected/1/versions8.1.0-1Source reference:
/affected/1/versions8.2.0-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
guzzle
Source reference: /affected/2/package/name
- Affected versions
- 7.11.0-1
Source reference:
/affected/2/versions7.12.0-1Source reference:
/affected/2/versions7.9.2-0.1Source reference:
/affected/2/versions - Fixed versions
- 7.12.1-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "guzzle",
"purl": "pkg:deb/debian/guzzle?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"7.11.0-1",
"7.12.0-1",
"7.12.1-1",
"7.12.3-1",
"7.13.1-1",
"7.14.0-1",
"7.14.1-1",
"7.14.2-1",
"7.15.0-1",
"7.15.1-1",
"7.15.2-1",
"7.15.3-1",
"7.15.5-1",
"7.4.5-1",
"7.9.2-0.1",
"8.0.1-1",
"8.0.2-1",
"8.1.0-1",
"8.2.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55568.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "guzzle",
"purl": "pkg:deb/debian/guzzle?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"7.11.0-1",
"7.12.0-1",
"7.12.1-1",
"7.12.3-1",
"7.13.1-1",
"7.14.0-1",
"7.14.1-1",
"7.14.2-1",
"7.15.0-1",
"7.15.1-1",
"7.15.2-1",
"7.15.3-1",
"7.15.5-1",
"7.9.2-0.1",
"8.0.1-1",
"8.0.2-1",
"8.1.0-1",
"8.2.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55568.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.12.1-1"
}
]
}
],
"package": {
"name": "guzzle",
"purl": "pkg:deb/debian/guzzle?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"7.11.0-1",
"7.12.0-1",
"7.9.2-0.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55568.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57860 · Revision 1
- Added to Heist Feed
- Publisher date