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Vulnerability · Published Aug 6, 2026 · Assigned by VulDB

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

Medium 6.3

In plain English

A medium-severity security flaw in mercury-agent from cosmicstack-labs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium
Exploit odds (30 days)0.4%top 69.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 (as reported)

VendorProductVersions
cosmicstack-labs mercury-agent 1.1.01.1.11.1.21.1.31.1.41.1.51.1.61.1.7

Weakness: CWE-285, CWE-266 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

References