{"id":"CVE-2026-94368","title":"A flaw was found in the signature verification logic of noobaa-core, the core component of the NooBaa Multicloud Object Gateway","summary":"A flaw was found in the signature verification logic of noobaa-core, the core component of the NooBaa Multicloud Object Gateway. The issue occurs when the service processes S3 presigned URLs using Signature Version 4 (SigV4). Due to impr…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","cwe":["CWE-347"],"vendor":"Red Hat","product":"odf4/mcg-core-rhel9","affected":["odf4/mcg-core-rhel9 (all versions)","rhceph-dev/odf4-mcg-core-rhel9 (all versions)"],"published":"2026-09-21","updated":"2026-09-22","sourceUpdated":"2026-09-22T19:37:36.747","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-94368","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-94368","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2537364","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94368.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-94368"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-94368"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00143,"epssPercentile":0.03951,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-21T19:40:21.563755Z"},"ingestedAt":"2026-09-21T12:36:35.289Z","slug":"CVE-2026-94368","body":"## Overview\n\nA flaw was found in the signature verification logic of noobaa-core, the core component of the NooBaa Multicloud Object Gateway. The issue occurs when the service processes S3 presigned URLs using Signature Version 4 (SigV4). Due to improper validation, the service fails to reject requests containing unsigned x-amz- headers, instead simply dropping them from the signature calculation. This allows an attacker who possesses a valid presigned PUT URL to add an unsigned x-amz-copy-source header, effectively converting a simple upload into a CopyObject operation. This can lead to unauthorized access and copying of any data the original signer is permitted to reach across the entire storage system.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Openshift Data Foundation 4 · no fix planned: Red Hat Openshift Data Foundation 4 · updated 2026-09-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94368.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}