{"id":"CVE-2026-44312","summary":"css_parser allows to MITM included https css urls","details":"css_parser is a Ruby CSS parser. Prior to 2.1.0 and 1.22.0, the CSS Parser gem does not validate HTTPS connections, allowing a Man-in-the-Middle (MITM) attacker to inject or modify CSS content when stylesheets are loaded via HTTPS. The connection is established with OpenSSL::SSL::VERIFY_NONE, meaning any HTTPS certificate—even entirely untrusted—will be accepted without validation. This vulnerability is fixed in 2.1.0 and 1.22.0.","aliases":["GHSA-ff6c-w6qf-7xqc"],"modified":"2026-07-15T01:49:07.862469212Z","published":"2026-05-14T16:15:04.907Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-295","CWE-829"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44312.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44312.json"},{"type":"ADVISORY","url":"https://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44312"},{"type":"REPORT","url":"https://github.com/premailer/css_parser/issues/185"},{"type":"FIX","url":"https://github.com/premailer/css_parser/commit/35e689c904225add78e0c488cf04bad052666449"},{"type":"FIX","url":"https://github.com/premailer/css_parser/commit/e0c95d5abe91b237becb90ff316531a6547ada18"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/premailer/css_parser","events":[{"introduced":"6fac0255b37ac468f8dde5b0da56d1b60e528310"},{"introduced":"0"},{"fixed":"300f130705f3b358039b8e848f659f971045b88b"},{"fixed":"040895b7e554f4afbbf1a0dbd239eb2b85de7c32"},{"fixed":"35e689c904225add78e0c488cf04bad052666449"},{"fixed":"e0c95d5abe91b237becb90ff316531a6547ada18"}],"database_specific":{"extracted_events":[{"introduced":"2.0.0"},{"fixed":"2.1.0"},{"introduced":"0"},{"fixed":"1.22.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v1.21.1","v2.0.0","v1.21.0","v1.20.0","v1.19.1","v1.19.0","v1.17.1","v1.17.0","v1.16.0","v1.15.0","v1.14.0","v1.13.0","v1.12.0","v1.11.0","v1.10.0","v1.9.0","v1.8.0","v1.7.1","v1.7.0","v1.6.0","v1.5.0","v1.5.0.pre2","v1.5.0.pre","v1.4.10","v1.4.9","v1.4.8","v1.4.7","v1.4.6","v1.4.5","v1.4.4","v1.4.3","v1.4.2","v1.4.1","v1.4.0","v1.3.7","v1.3.6","v1.3.5","v1.3.4","v1.3.3","v1.3.2","v1.3.1","v1.3.0","1.2.6","1.2.5","1.2.3","1.2.2","1.2.1","1.1.9","1.1.8","1.1.7","1.1.6","1.1.5","1.1.4","1.1.3","1.1.2","1.1.1","1.0.1","1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44312.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"}]}