{"document":{"category":"csaf_vex","csaf_version":"2.0","distribution":{"text":"Copyright © Red Hat, Inc. All rights reserved.","tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en","notes":[{"category":"legal_disclaimer","text":"This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.","title":"Terms of Use"}],"publisher":{"category":"vendor","contact_details":"https://access.redhat.com/security/team/contact/","issuing_authority":"Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.","name":"Red Hat Product Security","namespace":"https://www.redhat.com"},"references":[{"category":"self","summary":"Canonical URL","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48998.json"}],"title":"guzzlehttp/psr7: guzzlehttp/psr7: Information disclosure via improper Host header validation","tracking":{"current_release_date":"2026-06-28T07:43:05+00:00","generator":{"date":"2026-06-28T07:43:05+00:00","engine":{"name":"Red Hat SDEngine","version":"5.2.6"}},"id":"CVE-2026-48998","initial_release_date":"2026-06-11T12:34:32.397000+00:00","revision_history":[{"date":"2026-06-11T12:34:32.397000+00:00","number":"1","summary":"Initial version"},{"date":"2026-06-12T09:10:50.248751+00:00","number":"2","summary":"Current version"},{"date":"2026-06-28T07:43:05+00:00","number":"3","summary":"Last generated version"}],"status":"final","version":"3"}},"product_tree":{"branches":[{"category":"vendor","name":"Red Hat","product":{"name":"All currently supported Red Hat products","product_id":"red_hat_products","product_identification_helper":{"cpe":"cpe:/a:redhat"}}}]},"vulnerabilities":[{"cve":"CVE-2026-48998","discovery_date":"2026-06-11T13:00:53.357449+00:00","flags":[{"label":"vulnerable_code_not_present","product_ids":["red_hat_products"]}],"notes":[{"category":"description","text":"A flaw was found in guzzlehttp/psr7, a PHP library for HTTP messages. A remote attacker could exploit improper validation of the Host header. By providing a specially crafted Host header, an attacker could cause the system to misinterpret the intended destination. This could lead to requests or credentials being sent to an unintended host, resulting in information disclosure in certain forwarding or gateway configurations.","title":"Vulnerability description"},{"category":"other","text":"This Moderate flaw in `guzzlehttp/psr7` allows a remote attacker to provide a malformed Host header, leading to misinterpretation of the intended destination. This can result in information disclosure, particularly in forwarding or gateway configurations where applications rely on the parsed URI host for routing or security decisions and process untrusted HTTP requests.","title":"Statement"},{"category":"general","text":"The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.","title":"CVSS score applicability"}],"product_status":{"known_not_affected":["red_hat_products"]},"references":[{"category":"self","summary":"Canonical URL","url":"https://access.redhat.com/security/cve/CVE-2026-48998"},{"category":"external","summary":"https://www.cve.org/CVERecord?id=CVE-2026-48998","url":"https://www.cve.org/CVERecord?id=CVE-2026-48998"},{"category":"external","summary":"https://nvd.nist.gov/vuln/detail/CVE-2026-48998","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48998"},{"category":"external","summary":"https://github.com/guzzle/psr7/security/advisories/GHSA-34xg-wgjx-8xph","url":"https://github.com/guzzle/psr7/security/advisories/GHSA-34xg-wgjx-8xph"}],"release_date":"2026-06-11T12:34:32.397000+00:00","scores":[{"cvss_v3":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"products":["red_hat_products"]}],"title":"guzzlehttp/psr7: guzzlehttp/psr7: Information disclosure via improper Host header validation"}]}