{"id":"CVE-2026-77037","title":"multer: Multer: Denial of Service via file descriptor leak on aborted uploads (CVE-2026-77037)","summary":"A flaw was found in multer, a Node.js middleware for handling multipart/form-data. A remote attacker can exploit a file descriptor leak by sending repeated aborted or malformed multipart uploads. This can exhaust system resources, leading …","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-772","CWE-400","CWE-459"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["logging_subsystem_for_red_hat_openshift","developer_hub","enterprise_linux 10","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","trusted_profile_analyzer","ansible_automation_platform 2.2","developer_hub 1.10"],"patched":["ansible_automation_platform 2.2","developer_hub 1.10"],"published":"2026-08-28","updated":"2026-10-21","sourceUpdated":"2026-10-21T08:50:08+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77037.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77037.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-77037"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2525787"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-77037"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77037"},{"url":"https://cna.openjsf.org/security-advisories.html"},{"url":"https://github.com/expressjs/multer/security/advisories/GHSA-qfvm-cv95-jqjf"},{"url":"https://access.redhat.com/errata/RHSA-2026:86675"},{"url":"https://access.redhat.com/errata/RHSA-2026:82151"},{"url":"https://access.redhat.com/errata/RHSA-2026:76788"},{"url":"https://access.redhat.com/errata/RHSA-2026:79088"},{"url":"https://github.com/expressjs/multer/commit/eef74440b491ef0f976f3d25895e8089ae495df0"},{"url":"https://github.com/expressjs/multer/releases/tag/v2.3.0"},{"url":"https://github.com/advisories/GHSA-qfvm-cv95-jqjf"}],"tags":["csaf","vex","red-hat","ghsa","npm"],"epss":0.00457,"epssPercentile":0.39468,"aliases":["GHSA-qfvm-cv95-jqjf"],"ecosystem":"npm","ingestedAt":"2026-09-08T22:12:30.967Z","slug":"CVE-2026-77037","body":"## Overview\n\nA flaw was found in multer, a Node.js middleware for handling multipart/form-data. A remote attacker can exploit a file descriptor leak by sending repeated aborted or malformed multipart uploads. This can exhaust system resources, leading to a denial of service (DoS) for the affected application.\n\n## Vendor advisories\n\n- **RHSA-2026:86675** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.2 · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:86675)\n- **RHSA-2026:82151** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.2 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82151)\n- **RHSA-2026:76788** · Red Hat · fixed in: Red Hat Developer Hub 1.10 · released 2026-10-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:76788)\n- **RHSA-2026:79088** · Red Hat · fixed in: Red Hat Developer Hub 1.10 · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:79088)\n- **Red Hat VEX** · Important · affected: Logging Subsystem for Red Hat OpenShift, Red Hat Developer Hub, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · no fix planned: Logging Subsystem for Red Hat OpenShift, Red Hat Developer Hub, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, … · updated 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77037.json)\n\n**multer: Multer: Denial of Service via file descriptor leak on aborted uploads** — rated Important by Red Hat. Released 2026-08-28, updated 2026-10-21.\n\nAffected:\n\n- Logging Subsystem for Red Hat OpenShift\n- Red Hat Developer Hub\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat Trusted Profile Analyzer\n\nFixed:\n\n- Red Hat Ansible Automation Platform 2.2\n- Red Hat Developer Hub 1.10\n\nNo fix planned:\n\n- Logging Subsystem for Red Hat OpenShift\n- Red Hat Developer Hub\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat Trusted Profile Analyzer\n\nNot affected:\n\n- Red Hat Developer Hub 1.10\n- Red Hat 3scale API Management Platform 2\n- Red Hat Hardened Images\n\n## Remediation\n\nFor more about Ansible plugins for Red Hat Developer Hub, see References links https://access.redhat.com/errata/RHSA-2026:86675\nFor more about Ansible Portal Installer Bootc, see References links https://access.redhat.com/errata/RHSA-2026:82151\nFor more about Red Hat Developer Hub, see References links https://access.redhat.com/errata/RHSA-2026:76788\n\nWorkarounds / mitigations:\n\n- Upgrade to multer 2.3.0 or later, which properly closes the destination write stream on abnormal source termination and defers cleanup until the stream has closed.\n\n## Package advisory (CVE-2026-77037)\n\nAffected packages:\n\n- `multer = 2.2.0`\n\nPatched in:\n\n- `multer 2.3.0`\n\nSource: https://github.com/advisories/GHSA-qfvm-cv95-jqjf","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}