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guzzlehttp/guzzle-services

Open actionable advisories and recorded vendor fixes. This public package view has no inventory attached and cannot establish whether your deployment is affected. A vendor fix never resolves your finding; verify your installed version and the source guidance.

Open advisories

1 actionable advisory, newest first. Withdrawn advisories and news are excluded. Coverage is partial.

  1. Medium, CVSS 5.8PackagistPublished

    guzzlehttp/guzzle-services' XML Request Serialization Vulnerable to XML Injection via CDATA Terminator

    CVE-2026-53723 · GHSA-q8r6-5hfw-5jff

    Affected
    • Packagist guzzlehttp/guzzle-services < 1.5.4
    Fixed in
    1.5.4· Vendor fix available
    Issue
    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 remainder is interpreted as XML markup. This is an outgoing request-body integrity issue, not a response parsing issue. The attacker does not need to control the service description or schema. Users are affected when all of the following are true: 1. The application uses guzzlehttp/guzzle-services to serialize outgoing requests. 2. A request parameter or additionalParameters schema uses location: xml. 3. The value is serialized as XML element text, not an XML attribute. 4. The value can contain attacker-controlled, user-controlled, tenant-controlled, or otherwise untrusted input. 5. The value is not constrained by a safe enum, pattern, or custom filter that excludes ]]. 6. The downstream…

    Recommended action: Upgrade to 1.5.4 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.

    Sources:github.comSource checked Evidence →