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CVE Record

CVE-2026-45227: Heym < 0.0.21 Sandbox Escape via Python Introspection

Heym before 0.0.21 contains a sandbox escape vulnerability in the custom Python tool executor that allows authenticated workflow authors to bypass sandbox restrictions by using object-graph introspection primitives. Attackers can use Python introspection techniques to recover the unrestricted __import__ function, import blocked modules such as os and subprocess, and access inherited backend environment variables containing database credentials and encryption keys to execute arbitrary host commands as the backend service user.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Heym versions before 0.0.21 may let a logged-in workflow author break out of the intended Python sandbox. That could expose backend secrets and allow commands to run as the Heym service account. Treat this as high urgency where untrusted or semi-trusted users can author workflows.

Executive priority

Prioritize remediation for any shared, internet-accessible, or multi-user Heym deployment. The business risk is unauthorized access to secrets and backend command execution from a feature intended for controlled workflow automation.

Technical view

The issue is a sandbox escape in Heym’s custom Python tool executor. The CVE states authenticated workflow authors can use Python object-graph introspection to regain restricted import capability, load blocked modules, read inherited environment secrets, and execute host commands as the backend service user.

Likely exposure

Exposure is likely limited to deployments running Heym before 0.0.21 where authenticated users can create or edit workflows using the custom Python tool executor. Risk increases if backend environment variables contain database credentials, encryption keys, or other sensitive operational secrets.

Exploitation context

The bundle does not show KEV listing or confirmed active exploitation. The CVSS vector indicates network reachability, low attack complexity, low privileges required, no user interaction, and high confidentiality, integrity, and availability impact.

Researcher notes

Evidence supports a high-impact authenticated sandbox escape, but the bundle does not provide independent exploit-in-the-wild confirmation. Keep analysis tied to Heym before 0.0.21, the custom Python executor, authenticated workflow-author access, and the vendor patch/release references.

Mitigation direction

  • Upgrade Heym to version 0.0.21 or later.
  • Confirm the PR #94 or patch commit changes are present in deployed builds.
  • Restrict workflow-author permissions to trusted users until patched.
  • Rotate exposed backend secrets if compromise is suspected.
  • Review vendor guidance before applying compensating controls.

Validation and detection

  • Inventory Heym deployments and identify versions below 0.0.21.
  • Check whether custom Python tool execution is enabled.
  • Review which users can author or edit workflows.
  • Audit backend environment variables exposed to the Heym service.
  • Inspect logs for unusual workflow activity by authenticated users.
Prepared
Confidence
high
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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cwe · low confidence lookup

CWE-693: Exact CWE lookup

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description · low confidence lookup

Privilege behavior lookup

The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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description · low confidence lookup

Database behavior lookup

The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2026-45227 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
3Timeline events
1ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: pocAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9VulnCheck
8.7CVSS 4.0HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheck

Vulnerability scoring details

Base CVSS 4.0 score

8.7High
CVSS 4.0 vector shape for CVE-2026-45227Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
heymrunheym0, 32b7e809d987d9b018ec8daa2cdaf48f627f26f1affected
Weakness

CWE details

CWE-693

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-693 · source CWE mapping

CWE mapping pending import

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