{"apiVersion":"1.0","identifier":"CVE-2026-63385","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has two HTTP parsing weaknesses in http.c. evhttp_decode_uri_internal decodes percent-encoded %00 bytes into literal NUL characters, which can cause downstream C string operations to truncate a path and bypass validation performed on a different representation. evhttp_header_is_valid_value also accepts obsolete line folding in header values containing carriage return or line feed characters, allowing a proxy and libevent to interpret headers differently and enabling header injection or access control bypass. The CRLF header acceptance is fixed in versions 2.1.13 and 2.2.2-alpha, but the reviewed patches do not clearly remediate the URI NUL-truncation condition.","publishedAt":"2026-08-20T18:16:36","lastModifiedAt":"2026-08-21T22:16:42","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63385","cvssScore":9.2,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/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":0.00403,"riskScore":0.95,"affectedProduct":"libevent","affectedVersions":"<2.1.13, <2.2.2-alpha","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-63385","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-63385","en":"https://www.redsauce.net/en/cves/CVE-2026-63385","fr":"https://www.redsauce.net/fr/cves/CVE-2026-63385","pt":"https://www.redsauce.net/pt/cves/CVE-2026-63385","de":"https://www.redsauce.net/de/cves/CVE-2026-63385","sk":"https://www.redsauce.net/sk/cves/CVE-2026-63385","el":"https://www.redsauce.net/el/cves/CVE-2026-63385"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-63385"}}