CVE-2026-115374

CVSS 7.1 (high) · published 2026-10-22

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.

Weakness: CWE-347

Source: NVD CVE-2026-115374

References

• https://github.com/lxc/incus/security/advisories/GHSA-mmj7-8rgf-mx2h
• 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

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