CVE-2026-35527Public exploitNetwork attack vector

Authenticated blind SSRF via preflight HEAD request

Published May 5, 2026 · Updated May 5, 2026

SSRF in Incus before 7.0.0 allows remote authenticated users to make the daemon send blind HEAD requests to arbitrary destinations. The imgPostURLInfo function builds and sends the request from the supplied image-source URL before restricted.images.servers policy validation. Access to a restricted project is required; the request exposes server version and architecture headers and can probe host-reachable internal services.

CVSS severity5.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Incus before 7.0.0 allows remote authenticated users to make the daemon send blind HEAD requests to arbitrary destinations. The imgPostURLInfo function builds and sends the request from the supplied image-source URL before restricted.images.servers policy validation. Access to a restricted project is required; the request exposes server version and architecture headers and can probe host-reachable internal services.

The record

CVE
CVE-2026-35527
Published
May 5, 2026
Updated
May 5, 2026
Vendor
Linux Containers
Product
Incus
Classifications
CWE-918, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 5, 2026CVE publishedPublication date reported by the CVE source.
  2. May 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 7.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linux Containers · Incusversion=< 7.0.0

Published CVSS scores

5.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
5.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N
4.3GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Discovery

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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