---
title: "CVE-2026-115374: Incus - Authentication Bypass"
description: "Incus 7.0.0 < 7.0.2 and 7.1.0 < 7.5.0 contain a signature verification flaw in the built-in S3 server allowing presigned URL holders to inject unsigned x-amz-* headers, letting attackers disclose contents and ETags by copying bucket objects, exploit requires presigned URL access."
url: https://panop.io/threat-heartbeat/CVE-2026-115374/
---

# CVE-2026-115374 Incus - Authentication Bypass

Incus 7.0.0 < 7.0.2 and 7.1.0 < 7.5.0 contain a signature verification flaw in the built-in S3 server allowing presigned URL holders to inject unsigned x-amz-\* headers, letting attackers disclose contents and ETags by copying bucket objects, exploit requires presigned URL access.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-115374)

## Details

Type

Authentication Bypass

Impact

Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Published

22 October 2026

Updated

23 October 2026

Weakness

[CWE-347](https://cwe.mitre.org/data/definitions/347.html)

## Vendor fix

Upgrade to version 7.0.2, 7.5.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-115374](https://nvd.nist.gov/vuln/detail/CVE-2026-115374)
- [https://github.com/lxc/incus/security/advisories/GHSA-mmj7-8rgf-mx2h](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](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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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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