What is CVE-2025-27421?

CVE-2025-27421 is a high-severity vulnerability in Jasonlovesdoggo Abacus, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2025-03-03.

How severe is CVE-2025-27421?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Jasonlovesdoggo Abacus

CVE-2025-27421

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.

Vulnerability class: DoS (Denial of Service)

EPSS: 0.004 (30.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Jasonlovesdoggo Abacus — versions < 1.4.0

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2025-27421?: CVE-2025-27421 is a high-severity vulnerability in Jasonlovesdoggo Abacus, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2025-03-03.
How severe is CVE-2025-27421?: High severity. CVSS v3 base score is 7.5 out of 10.