CVE-2026-82477Network attack vector

Internal network access via unrestricted Tenable host URL

Published Aug 29, 2026 · Updated Aug 29, 2026

SSRF in MITRE SAF Heimdall 2.11.6 through 2.13.x allows remote attackers to reach internal resources through its Tenable integration. The Tenable controller accepts a client-supplied host_url and uses it in an Axios request without authenticating the caller or restricting the destination to an approved origin. Unauthenticated network access is sufficient, and the request originates from the server's network context; the published vector limits assessed impact to low integrity.

CVSS severity5.8
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in MITRE SAF Heimdall 2.11.6 through 2.13.x allows remote attackers to reach internal resources through its Tenable integration. The Tenable controller accepts a client-supplied host_url and uses it in an Axios request without authenticating the caller or restricting the destination to an approved origin. Unauthenticated network access is sufficient, and the request originates from the server's network context; the published vector limits assessed impact to low integrity.

The record

CVE
CVE-2026-82477
Published
Aug 29, 2026
Updated
Aug 29, 2026
Vendor
LinuxServer.io
Product
Heimdall
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=2.11.6 <2.14.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LinuxServer.io · Heimdallversion=2.11.6 <2.14.0

Published CVSS scores

5.8MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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