{"apiVersion":"1.0","identifier":"CVE-2026-63383","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent can read beyond a contiguous evbuffer region in event_tagging.c when decode_tag_internal requests at most five bytes from evbuffer_pullup but iterates using the full logical buffer length. A fragmented evbuffer containing a six-byte malformed tag can therefore advance past the pullup window and trigger an out-of-bounds read, which can crash a process that decodes attacker-controlled tagged RPC data. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","publishedAt":"2026-08-20T18:16:35","lastModifiedAt":"2026-08-20T19:16:57","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63383","cvssScore":8.7,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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":0.00384,"riskScore":0.9,"affectedProduct":"libevent","affectedVersions":"<2.1.13, <2.2.2-alpha","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-63383","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-63383","en":"https://www.redsauce.net/en/cves/CVE-2026-63383","fr":"https://www.redsauce.net/fr/cves/CVE-2026-63383","pt":"https://www.redsauce.net/pt/cves/CVE-2026-63383","de":"https://www.redsauce.net/de/cves/CVE-2026-63383","sk":"https://www.redsauce.net/sk/cves/CVE-2026-63383","el":"https://www.redsauce.net/el/cves/CVE-2026-63383"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-63383"}}