Vulnerability in Lxc Incus
CVE-2026-115374
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.
Published .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/lxc/incus/security/advisories/GHSA-mmj7-8rgf-mx2h (vendor-advisory)
- www.vulncheck.com/advisories/incus-7.0.0-before-7.0.2-and-7.1.0-before-7.5.0-un… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-115374?
- CVE-2026-115374 is a high-severity vulnerability in Lxc Incus, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.1/10. Published 2026-10-22.
- How severe is CVE-2026-115374?
- High severity. CVSS v3 base score is 7.1 out of 10.