{"items":[{"id":"NVI-00007993","kind":"vulnerability","title":"guzzlehttp/guzzle-services' XML Request Serialization Vulnerable to XML Injection via CDATA Terminator","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-q8r6-5hfw-5jff","CVE-2026-53723"],"plain_summary":"OSV carries this publisher advisory for guzzlehttp/guzzle-services. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 1.5.4 for guzzlehttp/guzzle-services. Confirm the publisher’s latest guidance.","source_ids":["sr-f1981beee489b4037489f90bbde3ecb2"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-f1981beee489b4037489f90bbde3ecb2","url":"https://github.com/advisories/GHSA-q8r6-5hfw-5jff","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-q8r6-5hfw-5jff","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:31.000Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-f1981beee489b4037489f90bbde3ecb2"],"technology":"guzzlehttp/guzzle-services","known_exclusions":[],"conditions_summary":"### Impact\n\n`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.\n\nUsers are affected when all of the following are true:\n\n1. The application uses `guzzlehttp/guzzle-services` to serialize outgoing requests.\n2. A request parameter or `additionalParameters` schema uses `location: xml`.\n3. The value is serialized as XML element text, not an XML attribute.\n4. The value can contain attacker-controlled, user-controlled, tenant-controlled, or otherwise untrusted input.\n5. The value is not constrained by a safe `enum`, `pattern`, or custom filter that excludes `]]>`.\n6. The downstream service parses the generated XML structurally and may act on unexpected, duplicated, or injected elements.\n\nApplications that serialize untrusted input into `locatio","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 1.5.4"]}],"null_published_at":"2026-10-31T22:13:22.824Z","source_updated_at":"2026-07-15T22:00:52.678Z","source_disclosed_at":"2026-06-11T13:05:01.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:42:31.000Z"}],"next_cursor":null,"snapshot_revision":"40769"}