{"id":"CVE-2026-42561","title":"python-multipart: python-multipart: Denial of Service via excessive multipart part headers (CVE-2026-42561)","summary":"A flaw was found in python-multipart. A remote attacker can exploit this denial of service (DoS) vulnerability by sending a specially crafted request with an excessive number of part headers or a single very large header value during multi…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-606","vendor":"Red Hat","product":"Red Hat Enterprise Linux AI (RHEL AI) 3","affected":["exploit_intelligence","ai_inference_server","ansible_automation_platform 2","enterprise_linux_ai_rhel_ai 3","openshift_ai_rhoai","satellite 6","ansible_automation_platform 2.6","ansible_automation_platform 2.7","migration_toolkit_for_applications 8.2","openshift_ai 3.3","satellite 6.17","satellite 6.18","satellite 6.19"],"patched":["ansible_automation_platform 2.6","ansible_automation_platform 2.7","migration_toolkit_for_applications 8.2","openshift_ai 3.3","satellite 6.17","satellite 6.18","satellite 6.19"],"published":"2026-05-13","updated":"2026-10-15","sourceUpdated":"2026-10-15T11:01:29+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42561.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42561.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-42561"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477309"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-42561"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42561"},{"url":"https://github.com/Kludex/python-multipart/security/advisories/GHSA-pp6c-gr5w-3c5g"},{"url":"https://access.redhat.com/errata/RHSA-2026:42132"},{"url":"https://access.redhat.com/errata/RHSA-2026:42142"},{"url":"https://access.redhat.com/errata/RHSA-2026:43038"},{"url":"https://access.redhat.com/errata/RHSA-2026:37275"},{"url":"https://access.redhat.com/errata/RHSA-2026:44696"},{"url":"https://access.redhat.com/errata/RHSA-2026:51357"},{"url":"https://access.redhat.com/errata/RHSA-2026:51194"},{"url":"https://access.redhat.com/errata/RHSA-2026:51219"},{"url":"https://github.com/Kludex/python-multipart"}],"tags":["csaf","vex","red-hat","osv","pip"],"epss":0.0074,"epssPercentile":0.54417,"aliases":["GHSA-pp6c-gr5w-3c5g","PYSEC-2026-3039"],"ecosystem":"pip","ingestedAt":"2026-07-13T18:58:01.583Z","slug":"CVE-2026-42561","body":"## Overview\n\nA flaw was found in python-multipart. A remote attacker can exploit this denial of service (DoS) vulnerability by sending a specially crafted request with an excessive number of part headers or a single very large header value during multipart/form-data parsing. This can lead to excessive CPU utilization, resulting in a denial of service for the affected system.\n\n## Vendor advisories\n\n- **RHSA-2026:42132** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.6 · released 2026-07-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:42132)\n- **RHSA-2026:42142** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.7 · released 2026-07-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:42142)\n- **RHSA-2026:43038** · Red Hat · fixed in: Red Hat Migration Toolkit for Applications 8.2 · released 2026-07-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:43038)\n- **RHSA-2026:37275** · Red Hat · fixed in: Red Hat OpenShift AI 3.3 · released 2026-07-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:37275)\n- **RHSA-2026:44696** · Red Hat · fixed in: Red Hat Satellite 6.17 · released 2026-07-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:44696)\n- **RHSA-2026:51357** · Red Hat · fixed in: Red Hat Satellite 6.18 · released 2026-08-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:51357)\n- **RHSA-2026:51194** · Red Hat · fixed in: Red Hat Satellite 6.19 · released 2026-08-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:51194)\n- **RHSA-2026:51219** · Red Hat · fixed in: Red Hat Satellite 6.19 · released 2026-08-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:51219)\n- **Red Hat VEX** · Important · affected: Exploit Intelligence, Red Hat AI Inference Server, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI), Red Hat Satellite 6 · no fix planned: Red Hat AI Inference Server, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux AI (RHEL AI) 3, Exploit Intelligence, … · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42561.json)\n\n**python-multipart: python-multipart: Denial of Service via excessive multipart part headers** — rated Important by Red Hat. Released 2026-05-13, updated 2026-10-15.\n\nAffected:\n\n- Exploit Intelligence\n- Red Hat AI Inference Server\n- Red Hat Ansible Automation Platform 2\n- Red Hat Enterprise Linux AI (RHEL AI) 3\n- Red Hat OpenShift AI (RHOAI)\n- Red Hat Satellite 6\n\nFixed:\n\n- Red Hat Ansible Automation Platform 2.6\n- Red Hat Ansible Automation Platform 2.7\n- Red Hat Migration Toolkit for Applications 8.2\n- Red Hat OpenShift AI 3.3\n- Red Hat Satellite 6.17\n- Red Hat Satellite 6.18\n- Red Hat Satellite 6.19\n\nNo fix planned:\n\n- Red Hat AI Inference Server\n- Red Hat Ansible Automation Platform 2\n- Red Hat Enterprise Linux AI (RHEL AI) 3\n- Exploit Intelligence\n- Red Hat OpenShift AI (RHOAI)\n- Red Hat Satellite 6\n\nNot affected:\n\n- Red Hat Ansible Automation Platform 2.6\n- Red Hat Ansible Automation Platform 2.7\n- Red Hat Migration Toolkit for Applications 8.2\n- Red Hat OpenShift AI 3.3\n- OpenShift Lightspeed\n- Red Hat AI Inference Server\n- Red Hat OpenShift AI (RHOAI)\n- Red Hat Satellite 6\n\n## Remediation\n\nBefore applying this update, make sure all previously released errata relevant to your system have been applied.\nFor details on how to apply this update, refer to:\nhttps://docs.redhat.com/en/documentation/red_hat_ansible_automation_platform/2.6#Upgrade https://access.redhat.com/errata/RHSA-2026:42132\nBefore applying this update, make sure all previously released errata relevant to your system have been applied.\nFor details on how to apply this update, refer to:\nhttps://docs.redhat.com/en/documentation/red_hat_ansible_automation_platform/2.7#Upgrade https://access.redhat.com/errata/RHSA-2026:42142\nBefore applying this update, make sure all previously released errata\nrelevant to your system have been applied. https://access.redhat.com/errata/RHSA-2026:43038\n\n## Package advisory (CVE-2026-42561)\n\nAffected packages:\n\n- `python-multipart < 0.0.27`\n\nPatched in:\n\n- `python-multipart 0.0.27`\n\nSource: https://osv.dev/vulnerability/GHSA-pp6c-gr5w-3c5g","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}