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 to a presigned upload URL to copy other bucket objects onto the granted key, disclosing their contents and ETags.
History

Fri, 23 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 23 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
Description 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 to a presigned upload URL to copy other bucket objects onto the granted key, disclosing their contents and ETags.
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
First Time appeared Linuxcontainers
Linuxcontainers incus
Weaknesses CWE-347
CPEs cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:*
Vendors & Products Linuxcontainers
Linuxcontainers incus
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-10-22T19:13:43.999Z

Updated: 2026-10-23T15:01:34.195Z

Reserved: 2026-10-22T11:24:28.627Z

Link: CVE-2026-115374

cve-icon Vulnrichment

Updated: 2026-10-23T14:48:26.229Z

cve-icon NVD

Status : Deferred

Published: 2026-10-22T19:17:43.953

Modified: 2026-10-23T17:06:36.030

Link: CVE-2026-115374

cve-icon Redhat

No data.