{"cve":"CVE-2025-5399","nvd":{"published":"2025-06-07T08:15:20.687","modified":"2026-06-17T09:47:50.807","status":"Analyzed","description":"Due to a mistake in libcurl's WebSocket code, a malicious server can send a\nparticularly crafted packet which makes libcurl get trapped in an endless\nbusy-loop.\n\nThere is no other way for the application to escape or exit this loop other\nthan killing the thread/process.\n\nThis might be used to DoS libcurl-using application.","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-835"],"references":["https://curl.se/docs/CVE-2025-5399.html","https://curl.se/docs/CVE-2025-5399.json","https://hackerone.com/reports/3168039","http://www.openwall.com/lists/oss-security/2025/06/04/2"],"products":["haxx:curl"],"source":"nvd","synced_at":"2026-10-19T22:02:23.998251710+00:00"},"epss":{"cve":"CVE-2025-5399","score":0.01376,"percentile":0.72051,"date":"2026-10-31"},"kev":null,"osv":[],"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."]}