Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
lxc incus
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Incus 7.0.0 至 7.0.2 之前版本，以及 7.1.0 至 7.5.0 之前版本，其内置 S3 服务器存在签名验证缺陷。该缺陷允许持有预签名 URL 的用户注入未签名的 请求头。攻击者可在预签名上传 URL 中添加未签名的 请求头，将其他存储桶中的对象复制到被授权密钥所对应的存储桶中，从而泄露这些对象的内容及其 ETag 值。

CVSS 7.1 · High

Affected Version Matrix 4

VendorProduct Version RangeStatus
lxc incus 7.0.0< 7.0.2 affected
7.0.2 unaffected
7.1.0< 7.5.0 affected
7.5.0 unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-115374

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability 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
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
lxc incus 7.0.0 ~ 7.0.2 -

II. Public POCs for CVE-2026-115374

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-115374

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-115374 (2)

Same Patch Batch · lxc · 2026-10-22 · 9 CVEs total

CVE-2026-115377 9.9 CRITICAL Incus before 6.0.7, 6.1.0 before 7.0.2, and 7.1.0 before 7.5.0 Arbitrary File Write via Sy
CVE-2026-115375 9.9 CRITICAL Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 Path Traversal via Instance Backup Depende
CVE-2026-115372 8.5 HIGH Incus 7.3.0 before 7.5.0 Project Restriction Bypass via block.create_options
CVE-2026-115376 7.7 HIGH Incus 7.0.1 before 7.0.2 and 7.2.0 before 7.5.0 Project Restriction Bypass via Custom Volu
CVE-2026-115371 7.1 HIGH LXC Incus 6.0.3 before 6.0.7, 6.6.0 before 7.0.2, and 7.1.0 before 7.5.0 Bucket Credential
CVE-2026-115373 6.3 MEDIUM Incus before 6.0.7, 6.1.0 before 7.0.2, and 7.1.0 before 7.5.0 Authorization Bypass via GE
CVE-2026-115378 5.8 MEDIUM Incus before 6.0.7, 6.1.0 before 7.0.2, and 7.1.0 before 7.5.0 Arbitrary File Write via Re
CVE-2026-115370 4.3 MEDIUM Incus 6.0.5 before 6.0.7, 6.12.0 before 7.0.2, and 7.1.0 before 7.5.0 Restricted Project B

IV. Related Vulnerabilities

Same product: incus
Same vendor: lxc
Same weakness: CWE-347

V. Comments for CVE-2026-115374

No comments yet

Leave a comment