CVE-2026-5752Public exploit

Root command execution via prototype-chain traversal

Published Apr 14, 2026 · Updated Apr 14, 2026

Sandbox escape in Cohere Terrarium before 1.0.1 allows attackers to execute arbitrary commands as root inside its Linux container. Plain-object jsglobals mocks in service.ts inherit Object.prototype, letting submitted Python reach the host Function constructor and globalThis. Exploitation requires code submission to the Pyodide sandbox; a successful escape controls the Node.js process and its container resources.

CVSS severity9.3
Critical
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox escape in Cohere Terrarium before 1.0.1 allows attackers to execute arbitrary commands as root inside its Linux container. Plain-object jsglobals mocks in service.ts inherit Object.prototype, letting submitted Python reach the host Function constructor and globalThis. Exploitation requires code submission to the Pyodide sandbox; a successful escape controls the Node.js process and its container resources.

The record

CVE
CVE-2026-5752
Published
Apr 14, 2026
Updated
Apr 14, 2026
Vendor
Cohere
Product
Terrarium
Classifications
CWE-1321, T1059.007
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 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=all

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Cohere · Terrariumversion=all

Published CVSS scores

9.3CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
9.3CohereCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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