{"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-2026-67353.json"}],"title":"guzzlehttp/guzzle: guzzlehttp/guzzle: Denial of Service via unbounded cookie storage","tracking":{"current_release_date":"2026-08-27T15:58:32+00:00","generator":{"date":"2026-08-27T15:58:32+00:00","engine":{"name":"Red Hat SDEngine","version":"5.3.16"}},"id":"CVE-2026-67353","initial_release_date":"2026-08-01T12:22:17.339000+00:00","revision_history":[{"date":"2026-08-01T12:22:17.339000+00:00","number":"1","summary":"Initial version"},{"date":"2026-08-27T15:28:58+00:00","number":"2","summary":"Current version"},{"date":"2026-08-27T15:58:32+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-2026-67353","discovery_date":"2026-08-01T13:04:22.006371+00:00","flags":[{"label":"vulnerable_code_not_present","product_ids":["red_hat_products"]}],"notes":[{"category":"description","text":"A flaw was found in guzzlehttp/guzzle. A remote attacker can exploit this vulnerability by sending an excessive number of large 'Set-Cookie' header fields from a malicious server. This causes the application's CookieJar to store an unbounded amount of data in memory, leading to resource exhaustion. The consequence is a Denial of Service (DoS), where the application becomes unresponsive or crashes due to excessive memory consumption and oversized cookie headers.","title":"Vulnerability description"},{"category":"other","text":"Community packages in Fedora and EPEL that bundle guzzlehttp/guzzle (nextcloud, roundcubemail) already ship patched versions (7.15.2 and 7.15.3 respectively) that include the fix for this vulnerability, and are therefore not affected.","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-2026-67353"},{"category":"external","summary":"https://www.cve.org/CVERecord?id=CVE-2026-67353","url":"https://www.cve.org/CVERecord?id=CVE-2026-67353"},{"category":"external","summary":"https://nvd.nist.gov/vuln/detail/CVE-2026-67353","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67353"},{"category":"external","summary":"https://github.com/guzzle/guzzle/security/advisories/GHSA-f283-ghqc-fg79","url":"https://github.com/guzzle/guzzle/security/advisories/GHSA-f283-ghqc-fg79"},{"category":"external","summary":"https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-unbounded-cookie-denial-of-service","url":"https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-unbounded-cookie-denial-of-service"}],"release_date":"2026-08-01T12:22:17.339000+00:00","scores":[{"cvss_v3":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"products":["red_hat_products"]}],"title":"guzzlehttp/guzzle: guzzlehttp/guzzle: Denial of Service via unbounded cookie storage"}]}