{"cve":"CVE-2025-27421","nvd":{"published":"2025-03-03T17:15:15.630","modified":"2026-06-17T09:03:33.370","status":"Deferred","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400","CWE-772"],"references":["https://github.com/JasonLovesDoggo/abacus/commit/898ff1204e11317cc161240b660e63eed5a72b33","https://github.com/JasonLovesDoggo/abacus/security/advisories/GHSA-vh64-54px-qgf8"],"products":[],"source":"nvd","synced_at":"2026-10-19T21:59:48.811064707+00:00"},"epss":{"cve":"CVE-2025-27421","score":0.00413,"percentile":0.35541,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-vh64-54px-qgf8","url":"https://osv.dev/vulnerability/GHSA-vh64-54px-qgf8","summary":"Goroutine Leak in Abacus SSE Implementation","modified":"2025-03-11T17:17:30Z","packages":[{"ecosystem":"Go","name":"github.com/jasonlovesdoggo/abacus","purl":"pkg:golang/github.com/jasonlovesdoggo/abacus","ranges":["<0.0.0-20250302043802-898ff1204e11"],"fixed":["0.0.0-20250302043802-898ff1204e11"]}]},{"id":"GO-2025-3498","url":"https://osv.dev/vulnerability/GO-2025-3498","summary":"Goroutine Leak in Abacus SSE Implementation in github.com/jasonlovesdoggo/abacus","modified":"2026-03-03T04:56:19.156480Z","packages":[{"ecosystem":"Go","name":"github.com/jasonlovesdoggo/abacus","purl":"pkg:golang/github.com/jasonlovesdoggo/abacus","ranges":["<0.0.0-20250302043802-898ff1204e11"],"fixed":["0.0.0-20250302043802-898ff1204e11"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}