{"id":"CVE-2026-33523","summary":"Apache HTTP Server: multiple modules: HTTP response splitting forwarding malicious status line","details":"HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised backend servers.\n\nThis issue affects Apache HTTP Server: from through 2.4.66.\n\nUsers are recommended to upgrade to version 2.4.67, which fixes the issue.","aliases":["BIT-apache-2026-33523"],"modified":"2026-05-10T11:50:49.621675Z","published":"2026-05-04T14:40:41.430Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33523.json","unresolved_ranges":[{"extracted_events":[{"introduced":"2.4.0"},{"last_affected":"2.4.66"}],"source":"AFFECTED_FIELD"},{"extracted_events":[{"fixed":"2.4.66"}],"source":"DESCRIPTION"}],"cna_assigner":"apache","cwe_ids":["CWE-443"]},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/05/04/23"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33523.json"},{"type":"ADVISORY","url":"https://httpd.apache.org/security/vulnerabilities_24.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33523"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/httpd","events":[{"introduced":"0"},{"fixed":"e4a77ef6051b3fe22eafacbcf54855b178a0bddd"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.4.66"}],"source":"DESCRIPTION"}}],"versions":["2.4.66-rc1-candidate"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-33523.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"}]}