{"id":"JLSEC-2026-1281","details":"An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack.","modified":"2026-08-13T10:00:03.322545018Z","published":"2026-08-13T09:49:53.975Z","upstream":["CVE-2020-25613"],"database_specific":{"license":"CC-BY-4.0","sources":[{"published":"2020-10-06T13:15:13.823Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2020-25613","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2020-25613","database_specific":{"status":"Modified"},"id":"CVE-2020-25613","imported":"2026-08-12T15:35:15.104Z","modified":"2026-06-17T03:06:58.977Z"}]},"references":[{"type":"WEB","url":"https://github.com/ruby/webrick/commit/8946bb38b4d87549f0d99ed73c62c41933f97cc7"},{"type":"WEB","url":"https://github.com/ruby/webrick/commit/8946bb38b4d87549f0d99ed73c62c41933f97cc7"},{"type":"WEB","url":"https://hackerone.com/reports/965267"},{"type":"WEB","url":"https://hackerone.com/reports/965267"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PFP3E7KXXT3H3KA6CBZPUOGA5VPFARRJ/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PFP3E7KXXT3H3KA6CBZPUOGA5VPFARRJ/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTZURYROG3FFED3TYCQOBV66BS4K6WOV/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTZURYROG3FFED3TYCQOBV66BS4K6WOV/"},{"type":"WEB","url":"https://security.gentoo.org/glsa/202401-27"},{"type":"WEB","url":"https://security.gentoo.org/glsa/202401-27"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20210115-0008/"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20210115-0008/"},{"type":"WEB","url":"https://www.ruby-lang.org/en/news/2020/09/29/http-request-smuggling-cve-2020-25613/"},{"type":"WEB","url":"https://www.ruby-lang.org/en/news/2020/09/29/http-request-smuggling-cve-2020-25613/"}],"affected":[{"package":{"name":"ruby_jll","ecosystem":"Julia","purl":"pkg:julia/ruby_jll?uuid=3ea333e9-fd8a-53ca-adba-366e8551b7d5"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1281.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V2","score":"AV:N/AC:L/Au:N/C:N/I:P/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}