{"apiVersion":"1.0","identifier":"CVE-2026-63380","description":"Libevent is an event notification library. Prior to 2.2.2-alpha, libevent can dereference invalid list pointers in ws.c when evws_new_session enters its error path after evhttp_start_ws_ succeeds but bufferevent_enable_locking_ fails. evws_connection_free sees a non-null http_server and unconditionally calls TAILQ_REMOVE even though the session was never inserted into http_server->ws_sessions. A local caller able to induce this allocation or locking failure can crash the process. This issue is fixed in version 2.2.2-alpha.","publishedAt":"2026-08-20T18:16:35","lastModifiedAt":"2026-08-25T16:17:05","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63380","cvssScore":5.7,"cvssVector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","epssProbability":0.00113,"riskScore":0.58,"affectedProduct":"libevent","affectedVersions":"<2.2.2-alpha","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-63380","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-63380","en":"https://www.redsauce.net/en/cves/CVE-2026-63380","fr":"https://www.redsauce.net/fr/cves/CVE-2026-63380","pt":"https://www.redsauce.net/pt/cves/CVE-2026-63380","de":"https://www.redsauce.net/de/cves/CVE-2026-63380","sk":"https://www.redsauce.net/sk/cves/CVE-2026-63380","el":"https://www.redsauce.net/el/cves/CVE-2026-63380"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-63380"}}