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CVE-2025-27421— Goroutine Leak in Abacus SSE Implementation

Quick assessment

Affected
JasonLovesDoggo abacus
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Abacus是Jason Cameron个人开发者的一个高度可扩展和无状态计数 API。 Abacus 1.4.0之前版本存在安全漏洞，该漏洞源于Server-Sent Events实现中的goroutine泄漏。

CVSS 7.5 · High EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-27421

Vulnerability Information
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Vulnerability Title
Goroutine Leak in Abacus SSE Implementation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Abacus 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Abacus是Jason Cameron个人开发者的一个高度可扩展和无状态计数 API。 Abacus 1.4.0之前版本存在安全漏洞，该漏洞源于Server-Sent Events实现中的goroutine泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
JasonLovesDoggo abacus < 1.4.0 -

II. Public POCs for CVE-2025-27421

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7654 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2025-27421

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Patches & Fixes for CVE-2025-27421 (1)

Vendor Advisories for CVE-2025-27421 (1)

IV. Related Vulnerabilities

Same product: abacus
Same vendor: JasonLovesDoggo
Same weakness: CWE-400

V. Comments for CVE-2025-27421

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