{"id":"CVE-2026-46727","aliases":["BELL-CVE-2026-46727","BIT-ruby-2026-46727","BIT-ruby-min-2026-46727","EUVD-2026-31477","GHSA-jfc8-2xw7-c79m","UBUNTU-CVE-2026-46727","openSUSE-SU-2026:10839-1"],"status":"published","title":"An issue was discovered in Ruby 4 before 4.0.5. A race condition leading to a use-after-free in...","description":"An issue was discovered in Ruby 4 before 4.0.5. A race condition leading to a use-after-free in the pthread-based getaddrinfo timeout handler (rb_getaddrinfo in ext/socket/raddrinfo.c) allows a remote attacker who can delay DNS responses near the user-specified timeout to crash a Ruby process that calls Addrinfo.getaddrinfo(..., timeout:) or Socket.tcp(..., resolv_timeout:). Memory-corruption-based exploitation is theoretically possible. The attack could, for example, be carried out through a crafted authoritative DNS server or recursive resolver.","severity":{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00478,"percentile":0.41565,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-362"],"published":"2026-05-21T00:00:00Z","modified":"2026-10-28T02:31:10Z","fixes":[{"ecosystem":"Bitnami","package":"ruby","fixed_in":["4.0.5"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"ruby-min","fixed_in":["4.0.5"],"sources":["osv"]},{"ecosystem":"openSUSE:Tumbleweed","package":"ruby4.0","fixed_in":["4.0.5-1.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"ruby","ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0"},{"fixed":"4.0.5"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"ruby-min","ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0"},{"fixed":"4.0.5"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"jruby","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.6-5ubuntu1","1.5.6-6","1.5.6-7","1.5.6-9+deb8u2build0.14.04.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"ruby2.3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.0-1","2.3.0-2","2.3.0-4ubuntu2","2.3.0-4ubuntu3","2.3.0-5ubuntu1","2.3.1-2~16.04","2.3.1-2~16.04.2","2.3.1-2~16.04.4","2.3.1-2~16.04.5","2.3.1-2~16.04.6","2.3.1-2~16.04.7","2.3.1-2~16.04.9","2.3.1-2~16.04.10","2.3.1-2~16.04.11","2.3.1-2~16.04.12","2.3.1-2~ubuntu16.04.13","2.3.1-2~ubuntu16.04.14","2.3.1-2~ubuntu16.04.15","2.3.1-2~ubuntu16.04.16","2.3.1-2~ubuntu16.04.16+esm1","2.3.1-2~ubuntu16.04.16+esm2","2.3.1-2~ubuntu16.04.16+esm3","2.3.1-2~ubuntu16.04.16+esm4","2.3.1-2~ubuntu16.04.16+esm5","2.3.1-2~ubuntu16.04.16+esm6","2.3.1-2~ubuntu16.04.16+esm7","2.3.1-2~ubuntu16.04.16+esm8","2.3.1-2~ubuntu16.04.16+esm9","2.3.1-2~ubuntu16.04.16+esm10","2.3.1-2~ubuntu16.04.16+esm11","2.3.1-2~ubuntu16.04.16+esm12","2.3.1-2~ubuntu16.04.16+esm14","2.3.1-2~ubuntu16.04.16+esm15"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"jruby","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.21-2ubuntu4","1.7.22-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"ruby2.5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.0~preview1-1ubuntu2","2.5.0-4ubuntu1","2.5.0-4ubuntu4","2.5.0-5ubuntu1","2.5.0-6ubuntu1","2.5.1-1ubuntu1","2.5.1-1ubuntu1.1","2.5.1-1ubuntu1.2","2.5.1-1ubuntu1.4","2.5.1-1ubuntu1.5","2.5.1-1ubuntu1.6","2.5.1-1ubuntu1.7","2.5.1-1ubuntu1.8","2.5.1-1ubuntu1.9","2.5.1-1ubuntu1.10","2.5.1-1ubuntu1.11","2.5.1-1ubuntu1.12","2.5.1-1ubuntu1.13","2.5.1-1ubuntu1.14","2.5.1-1ubuntu1.15","2.5.1-1ubuntu1.16","2.5.1-1ubuntu1.16+esm1","2.5.1-1ubuntu1.16+esm3","2.5.1-1ubuntu1.16+esm4","2.5.1-1ubuntu1.16+esm5","2.5.1-1ubuntu1.16+esm6","2.5.1-1ubuntu1.16+esm7","2.5.1-1ubuntu1.16+esm8"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"jruby","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.1.13.0-1","9.1.17.0-1~18.04"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"ruby2.7","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.0-1","2.7.0-2","2.7.0-3","2.7.0-4","2.7.0-4ubuntu1","2.7.0-5ubuntu1","2.7.0-5ubuntu1.1","2.7.0-5ubuntu1.2","2.7.0-5ubuntu1.3","2.7.0-5ubuntu1.4","2.7.0-5ubuntu1.5","2.7.0-5ubuntu1.6","2.7.0-5ubuntu1.7","2.7.0-5ubuntu1.8","2.7.0-5ubuntu1.9","2.7.0-5ubuntu1.10","2.7.0-5ubuntu1.11","2.7.0-5ubuntu1.12","2.7.0-5ubuntu1.13","2.7.0-5ubuntu1.14","2.7.0-5ubuntu1.15","2.7.0-5ubuntu1.16","2.7.0-5ubuntu1.17","2.7.0-5ubuntu1.18","2.7.0-5ubuntu1.18+esm1","2.7.0-5ubuntu1.18+esm3","2.7.0-5ubuntu1.18+esm4","2.7.0-5ubuntu1.18+esm5"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"jruby","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.1.17.0-3","9.1.17.0-3build5","9.1.17.0-3build6"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"ruby3.0","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.2-5ubuntu1","3.0.2-7","3.0.2-7ubuntu2","3.0.2-7ubuntu2.1","3.0.2-7ubuntu2.2","3.0.2-7ubuntu2.3","3.0.2-7ubuntu2.4","3.0.2-7ubuntu2.5","3.0.2-7ubuntu2.6","3.0.2-7ubuntu2.7","3.0.2-7ubuntu2.8","3.0.2-7ubuntu2.10","3.0.2-7ubuntu2.11","3.0.2-7ubuntu2.12","3.0.2-7ubuntu2.13"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"jruby","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.3.9.0+ds-1","9.4.5.0+ds-1","9.4.5.0+ds-1ubuntu1","9.4.6.0+ds-1ubuntu3"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"ruby3.2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.3-1","3.2.3-1build2","3.2.3-1build3","3.2.3-1ubuntu0.24.04.1","3.2.3-1ubuntu0.24.04.3","3.2.3-1ubuntu0.24.04.5","3.2.3-1ubuntu0.24.04.6","3.2.3-1ubuntu0.24.04.7","3.2.3-1ubuntu0.24.04.8"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"jruby","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.4.8.0+ds-2ubuntu1","9.4.8.0+ds-3ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"ruby3.3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.7-1ubuntu2","3.3.8-2ubuntu1","3.3.8-2ubuntu2","3.3.8-2ubuntu2.1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"jruby","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.4.8.0+ds-3ubuntu1","9.4.14.0+ds-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"ruby3.3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.8-2ubuntu3","3.3.8-2.2ubuntu4"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"jruby","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.4.8.0+ds-3ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"ruby3.3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.8-2ubuntu2","3.3.8-2ubuntu3","3.3.8-2ubuntu3.1"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"ruby4.0","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.0.5-1.1"}]}]}],"products":[{"vendor":"hackerone","product":"ruby"},{"vendor":"ruby-lang","product":"ruby"}],"references":[{"url":"https://hackerone.com/reports/3607434","tags":["Permissions Required","web","report"]},{"url":"https://www.ruby-lang.org/en/news/2026/05/20/getaddrinfo-cve-2026-46727/","tags":["Vendor Advisory","advisory","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46727","tags":["web","advisory"]},{"url":"https://www.ruby-lang.org/en/news/2026/05/20/getaddrinfo-cve-2026-46727"},{"url":"https://github.com/advisories/GHSA-jfc8-2xw7-c79m"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-46727","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46727.json","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-46727","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46727","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-46727","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-46727","description":"An issue was discovered in Ruby 4 before 4.0.5. A race condition leading to a use-after-free in the pthread-based getaddrinfo timeout handler (rb_getaddrinfo in ext/socket/raddrinfo.c) allows a remote attacker who can delay DNS responses near the user-specified timeout to crash a Ruby process that calls Addrinfo.getaddrinfo(..., timeout:) or Socket.tcp(..., resolv_timeout:). Memory-corruption-based exploitation is theoretically possible. The attack could, for example, be carried out through a crafted authoritative DNS server or recursive resolver.","status":"published","published":"2026-05-22T00:00:00Z","modified":"2026-05-22T18:41:39.767Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T13:46:55.086623Z"}],"euvd":[{"id":"EUVD-2026-31477","description":"An issue was discovered in Ruby 4 before 4.0.5. A race condition leading to a use-after-free in the pthread-based getaddrinfo timeout handler (rb_getaddrinfo in ext/socket/raddrinfo.c) allows a remote attacker who can delay DNS responses near the user-specified timeout to crash a Ruby process that calls Addrinfo.getaddrinfo(..., timeout:) or Socket.tcp(..., resolv_timeout:). Memory-corruption-based exploitation is theoretically possible. The attack could, for example, be carried out through a crafted authoritative DNS server or recursive resolver.","status":"published","published":"2026-05-22T00:00:00Z","modified":"2026-05-22T18:41:39Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T18:21:12.112235Z"}],"ghsa":[{"id":"GHSA-jfc8-2xw7-c79m","title":"An issue was discovered in Ruby 4 before 4.0.5. A race condition leading to a use-after-free in...","description":"An issue was discovered in Ruby 4 before 4.0.5. A race condition leading to a use-after-free in the pthread-based getaddrinfo timeout handler (rb_getaddrinfo in ext/socket/raddrinfo.c) allows a remote attacker who can delay DNS responses near the user-specified timeout to crash a Ruby process that calls Addrinfo.getaddrinfo(..., timeout:) or Socket.tcp(..., resolv_timeout:). Memory-corruption-based exploitation is theoretically possible. The attack could, for example, be carried out through a crafted authoritative DNS server or recursive resolver.","status":"published","published":"2026-05-26T13:30:20Z","modified":"2026-05-26T13:30:26Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T15:08:16.245994Z"}],"nvd":[{"id":"CVE-2026-46727","description":"An issue was discovered in Ruby 4 before 4.0.5. A race condition leading to a use-after-free in the pthread-based getaddrinfo timeout handler (rb_getaddrinfo in ext/socket/raddrinfo.c) allows a remote attacker who can delay DNS responses near the user-specified timeout to crash a Ruby process that calls Addrinfo.getaddrinfo(..., timeout:) or Socket.tcp(..., resolv_timeout:). Memory-corruption-based exploitation is theoretically possible. The attack could, for example, be carried out through a crafted authoritative DNS server or recursive resolver.","status":"published","published":"2026-05-22T18:16:22.927Z","modified":"2026-07-23T16:10:00.137Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T14:12:20.131508Z"}],"osv":[{"id":"BELL-CVE-2026-46727","title":"CVE-2026-46727 does not affect BellSoft software","status":"withdrawn","published":"2026-05-28T06:11:40.989069Z","modified":"2026-05-30T07:15:20.863238653Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:24.391068Z"},{"id":"CVE-2026-46727","description":"An issue was discovered in Ruby 4 before 4.0.5. A race condition leading to a use-after-free in the pthread-based getaddrinfo timeout handler (rb_getaddrinfo in ext/socket/raddrinfo.c) allows a remote attacker who can delay DNS responses near the user-specified timeout to crash a Ruby process that calls Addrinfo.getaddrinfo(..., timeout:) or Socket.tcp(..., resolv_timeout:). Memory-corruption-based exploitation is theoretically possible. The attack could, for example, be carried out through a crafted authoritative DNS server or recursive resolver.","status":"published","published":"2026-05-22T00:00:00Z","modified":"2026-10-28T02:31:10.857292234Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T15:45:06.231145Z"},{"id":"UBUNTU-CVE-2026-46727","description":"An issue was discovered in Ruby 4 before 4.0.5. A race condition leading to a use-after-free in the pthread-based getaddrinfo timeout handler (rb_getaddrinfo in ext/socket/raddrinfo.c) allows a remote attacker who can delay DNS responses near the user-specified timeout to crash a Ruby process that calls Addrinfo.getaddrinfo(..., timeout:) or Socket.tcp(..., resolv_timeout:). Memory-corruption-based exploitation is theoretically possible. The attack could, for example, be carried out through a crafted authoritative DNS server or recursive resolver.","status":"published","published":"2026-05-22T18:16:00Z","modified":"2026-10-17T12:55:49.050295833Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:30.797112Z"},{"id":"BIT-ruby-2026-46727","description":"An issue was discovered in Ruby 4 before 4.0.5. A race condition leading to a use-after-free in the pthread-based getaddrinfo timeout handler (rb_getaddrinfo in ext/socket/raddrinfo.c) allows a remote attacker who can delay DNS responses near the user-specified timeout to crash a Ruby process that calls Addrinfo.getaddrinfo(..., timeout:) or Socket.tcp(..., resolv_timeout:). Memory-corruption-based exploitation is theoretically possible. The attack could, for example, be carried out through a crafted authoritative DNS server or recursive resolver.","status":"published","published":"2026-05-27T08:57:36.72Z","modified":"2026-09-08T08:48:19.387759322Z","updated_at":"2026-11-02T15:28:35.111822Z"},{"id":"BIT-ruby-min-2026-46727","description":"An issue was discovered in Ruby 4 before 4.0.5. A race condition leading to a use-after-free in the pthread-based getaddrinfo timeout handler (rb_getaddrinfo in ext/socket/raddrinfo.c) allows a remote attacker who can delay DNS responses near the user-specified timeout to crash a Ruby process that calls Addrinfo.getaddrinfo(..., timeout:) or Socket.tcp(..., resolv_timeout:). Memory-corruption-based exploitation is theoretically possible. The attack could, for example, be carried out through a crafted authoritative DNS server or recursive resolver.","status":"published","published":"2026-05-27T08:57:37.33Z","modified":"2026-09-08T08:48:19.204703518Z","updated_at":"2026-11-02T15:28:35.111822Z"},{"id":"openSUSE-SU-2026:10839-1","title":"libruby4_0-4_0-4.0.5-1.1 on GA media","description":"These are all security issues fixed in the libruby4_0-4_0-4.0.5-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-05-21T00:00:00Z","modified":"2026-05-22T09:00:06.582364524Z","updated_at":"2026-11-02T16:58:38.415593Z"}]}}