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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/JasonLovesDoggo/abacus/commit/898ff1204e11317cc161240b660e63e
- https://github.com/JasonLovesDoggo/abacus/security/advisories/GHSA-vh64-54px-qgf
FAQ
What is CVE-2025-27421?
CVE-2025-27421 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 whe...
How severe is CVE-2025-27421?
CVE-2025-27421 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-27421?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.