What’s Vulnerable › Vulnerabilities

CVE-2026-115374: Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 Unsigned Header Bypass in Presigned S3 Upload URLs

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-22 · updated 2026-10-23
• Weakness: CWE-347

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.

Affected products

• lxc incus: from 7.0.0 before 7.0.2; from 7.1.0 before 7.5.0 — fixed in 7.0.2, 7.5.0

How to fix

Upgrade to a fixed version: lxc incus 7.0.2, 7.5.0. Check the vendor advisory for mitigations.

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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