CVE-2026-82859Network attack vector

IAM boundary bypass via unconstrained role tagging

Published Aug 31, 2026 · Updated Aug 31, 2026

Improper access control in Hulumi before 1.3.2 allows remote attackers to bypass IAM boundaries through a deployment SCP template. The template does not constrain tag-on-create use of the hulumi:iac-role marker, so attacker-controlled resources can satisfy its trusted-role condition. Exposure requires a downstream AWS deployment that imported the pre-1.3.2 template and relies on that tag as its IAM boundary.

CVSS severity9.3
Critical
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Hulumi before 1.3.2 allows remote attackers to bypass IAM boundaries through a deployment SCP template. The template does not constrain tag-on-create use of the hulumi:iac-role marker, so attacker-controlled resources can satisfy its trusted-role condition. Exposure requires a downstream AWS deployment that imported the pre-1.3.2 template and relies on that tag as its IAM boundary.

The record

CVE
CVE-2026-82859
Published
Aug 31, 2026
Updated
Aug 31, 2026
Vendor
Sherif Mansour
Product
Hulumi
Classifications
CWE-284, T1098.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 31, 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=0 <1.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sherif Mansour · Hulumiversion=0 <1.3.2

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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-284Improper Access Control
T1098.003Additional Cloud Roles

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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