What’s Vulnerable › Vulnerabilities

CVE-2026-18998: cosmicstack-labs mercury-agent delegate_task Tool sub-agent.ts SubAgent.run improper authorization

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-06 · updated 2026-10-23
• Weakness: CWE-266

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 products

• cosmicstack-labs mercury-agent: 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 1.1.5 (+7)

References

• https://github.com/cosmicstack-labs/mercury-agent/
• https://github.com/cosmicstack-labs/mercury-agent/issues/74
• https://vuldb.com/cve/CVE-2026-18998
• https://vuldb.com/submit/862628
• https://vuldb.com/submit/862629
• https://vuldb.com/vuln/386381
• https://vuldb.com/vuln/386381/cti

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