CVE-2026-77357
Mesop is a Python-based UI framework that allows users to build web applications. Prior to 1.3.3, applications running in debug mode expose a GET /hot-reload endpoint whose unbounded loop depends on the user-supplied counter parameter, allowing an unauthenticated attacker to hold worker threads with high counter values until the worker pool is exhausted and the server becomes unavailable. A single unauthenticated attacker can crash the Mesop server with minimal effort. Because the attack leverages worker exhaustion, the server remains unresponsive until it is manually restarted. This issue is fixed in version 1.3.3.
Scoring
- Severity
- HIGH
- CVSS base score
- 8.7
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- EPSS probability
- 0.30%
- CWE
- CWE-400, CWE-834
- Published
- 2026-08-25
- Last modified
- 2026-08-26
Affected products
- mesop-dev mesop
Weakness type
Related vulnerabilities
- CVE-2026-22591 — Fast DDS DDSSQLFilter Recursive Parser Stack Exhaustion (Remote DoS)
- CVE-2026-86204 — PocketMine-MP before 5.39.2 Denial of Service via ModalFormResponsePacket
- CVE-2026-86201 — PocketMine-MP before 5.41.1 LogDoS via LoginPacket clientData
- CVE-2025-71418 — PocketMine-MP before 5.25.2 Denial of Service via explode
- CVE-2026-53937 — MCP Kotlin SDK's unbounded line buffer in StdioServerTransport/StdioClientTransport leads to memory exhaustion (DoS)
- CVE-2026-82001 — Acrobat Reader | Uncontrolled Resource Consumption (CWE-400)
- CVE-2026-76000 — ColdFusion | Uncontrolled Resource Consumption (CWE-400)
- CVE-2026-83968 — Windows Biometric Service Elevation of Privilege Vulnerability