XML Injection

Overview Affected versions of this package are vulnerable to XML Injection during request serialization of scalar XML element values. An attacker can smuggle raw XML markup into generated output by supplying a string that contains CDATA terminator . This lets attacker-controlled content break out...

GHSA-Q8R6-5HFW-5JFF guzzlehttp/guzzle-services' XML Request Serialization Vulnerable to XML Injection via CDATA Terminator

Impact guzzlehttp/guzzle-services does not safely serialize scalar XML element values containing the CDATA terminator . The XML request serializer writes values containing , or & with XMLWriter::writeCData$value. If attacker-controlled input contains , the CDATA section closes early and the...

guzzlehttp/psr7 has CRLF Injection via URI Host Component

Impact guzzlehttp/psr7 did not reject ASCII control characters, whitespace, or DEL in first-party URI host components. The issue requires a PSR-7 request to be serialized into a raw HTTP/1.x message, for example with GuzzleHttp\Psr7\Message::toString or an equivalent custom serializer. Creating a...

CVE-2026-53723

Guzzle Services (guzzlehttp/guzzle-services) contains an XML request serialization flaw in versions before 1.5.4 where scalar XML element values may include the CDATA terminator ]]>, causing the CDATA to end early and injecting XML markup into outgoing requests. This is an outgoing request‑bod...

CVE-2026-39832

When adding a key to a remote agent constraint extensions such as [email protected] were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all...