{"id":"CVE-2026-115374","title":"Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 Unsigned Header Bypass in Presigned S3 Upload URLs","summary":"Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 contains a signature verification flaw in its built-in S3 server that allows presigned URL holders to inject unsigned x-amz-* headers. Attackers can add an unsigned X-Amz-Copy-Source header…","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","cvssSource":"cna","cwe":["CWE-347"],"vendor":"lxc","product":"incus","affected":["incus >= 7.0.0 < 7.0.2","incus >= 7.1.0 < 7.5.0"],"published":"2026-10-22","updated":"2026-10-22","sourceUpdated":"2026-10-22T19:13:43.999Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115374","references":[{"url":"https://github.com/lxc/incus/security/advisories/GHSA-mmj7-8rgf-mx2h","label":"GitHub Security Advisory (GHSA-mmj7-8rgf-mx2h)"},{"url":"https://www.vulncheck.com/advisories/incus-7.0.0-before-7.0.2-and-7.1.0-before-7.5.0-unsigned-header-bypass-in-presigned-s3-upload-urls","label":"VulnCheck Advisory: Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 Unsigned Header Bypass in Presigned S3 Upload URLs"}],"tags":["cve.org"],"ingestedAt":"2026-10-22T22:00:50.401Z","slug":"CVE-2026-115374","body":"## Overview\n\nIncus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 contains a signature verification flaw in its built-in S3 server that allows presigned URL holders to inject unsigned x-amz-* headers. Attackers can add an unsigned X-Amz-Copy-Source header to a presigned upload URL to copy other bucket objects onto the granted key, disclosing their contents and ETags.\n\n## Affected\n\n- `incus >= 7.0.0 < 7.0.2`\n- `incus >= 7.1.0 < 7.5.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}