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CVE-2025-27421

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Date: March 3, 2025

Abacus is a highly scalable and stateless counting API. A critical goroutine leak vulnerability has been identified in the Abacus server's Server-Sent Events (SSE) implementation. The issue occurs when clients disconnect from the /stream endpoint, as the server fails to properly clean up resources and terminate associated goroutines. This leads to resource exhaustion where the server continues running but eventually stops accepting new SSE connections while maintaining high memory usage. The vulnerability specifically involves improper channel cleanup in the event handling mechanism, causing goroutines to remain blocked indefinitely. This vulnerability is fixed in 1.4.0.

Severity Score

Severity Score

Weakness Type (CWE)

Uncontrolled Resource Consumption

CWE-400

Missing Release of Resource after Effective Lifetime

CWE-772

Top Fix

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Upgrade Version

Upgrade to version github.com/jasonlovesdoggo/abacus - v0.0.0-20250302043802-898ff1204e11

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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