{"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-2026-55767.json"}],"title":"guzzlehttp/guzzle: Guzzle: Cookie injection and session fixation due to improper domain validation","tracking":{"current_release_date":"2026-06-28T07:12:20+00:00","generator":{"date":"2026-06-28T07:12:20+00:00","engine":{"name":"Red Hat SDEngine","version":"5.2.6"}},"id":"CVE-2026-55767","initial_release_date":"2026-06-23T15:05:05.552000+00:00","revision_history":[{"date":"2026-06-23T15:05:05.552000+00:00","number":"1","summary":"Initial version"},{"date":"2026-06-23T19:41:43.030418+00:00","number":"2","summary":"Current version"},{"date":"2026-06-28T07:12:20+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-2026-55767","discovery_date":"2026-06-23T16:01:32.724970+00:00","flags":[{"label":"vulnerable_code_not_present","product_ids":["red_hat_products"]}],"notes":[{"category":"description","text":"A flaw was found in Guzzle, an extensible PHP HTTP client. The CookieJar component incorrectly accepted cookies with dot-only or whitespace-padded domain attributes. This vulnerability allows an attacker-controlled origin, when an application requests it with a shared cookie jar, to set a cookie that Guzzle may later send to unrelated hosts using the same jar. This could lead to cookie injection or session fixation against downstream services, potentially compromising user sessions or injecting malicious data.","title":"Vulnerability description"},{"category":"other","text":"Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.","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-2026-55767"},{"category":"external","summary":"https://www.cve.org/CVERecord?id=CVE-2026-55767","url":"https://www.cve.org/CVERecord?id=CVE-2026-55767"}],"release_date":"2026-06-23T15:05:05.552000+00:00","scores":[{"cvss_v3":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.2,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","version":"3.1"},"products":["red_hat_products"]}],"title":"guzzlehttp/guzzle: Guzzle: Cookie injection and session fixation due to improper domain validation"}]}