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CVE-2026-18998

cosmicstack-labs mercury-agent delegate_task Tool sub-agent.ts SubAgent.run improper authorization

MEDIUM

6.3

CVSS Score

Published: August 6, 2026 at 04:45 AM UTC

Updated: October 23, 2026 at 09:10 PM UTC

1 product affected across 1 vendorMercury Agent

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Severity

MEDIUM6.3

Exploit prediction

EPSS 0.4%

SSVC

PoC

Description

A vulnerability was determined in cosmicstack-labs mercury-agent up to 1.1.12. Impacted is the function SubAgent.run of the file src/core/sub-agent.ts of the component delegate_task Tool. Executing a manipulation can lead to improper authorization. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mercury Agent · Cosmicstack

95%

All versions1.1.0 1.1.1 1.1.10 1.1.11 1.1.12 1.1.2 1.1.3 1.1.4 1.1.5 1.1.6 1.1.7 1.1.8 1.1.9

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (7)

VDB EntryTechnical Description

Source: cverecord

https://vuldb.com/vuln/386381

SignaturePermissions Required

Source: cverecord

https://vuldb.com/vuln/386381/cti

Third Party Advisory

Source: cverecord

https://vuldb.com/cve/CVE-2026-18998

Third Party Advisory

Source: cverecord

https://vuldb.com/submit/862628

Third Party Advisory

Source: cverecord

https://vuldb.com/submit/862629

ExploitIssue Tracking

Source: cverecord

https://github.com/cosmicstack-labs/mercury-agent/issues/74

Product

Source: cverecord

https://github.com/cosmicstack-labs/mercury-agent/

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.3MEDIUMVulDB

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-285CWE-266

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