{"id":"CVE-2026-49329","title":"A flaw was found in openshift/oauth-server","summary":"A flaw was found in openshift/oauth-server. The OAuth login and error page endpoints pass the unauthenticated Accept-Language header to golang.org/x/text/language.ParseAcceptLanguage() without input validation. A bypass of the CVE-2022-3…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-407"],"vendor":"Red Hat","product":"openshift4/ose-oauth-server-rhel9","affected":["openshift4/ose-oauth-server-rhel9 (all versions)","openshift4/ose-oauth-server-rhel9 (all versions)","openshift4/ose-oauth-server-rhel9 (all versions)","openshift4/ose-oauth-server-rhel9 (all versions)","openshift4/ose-oauth-server-rhel8 (all versions)"],"patched":["openshift_container_platform 4.20","openshift_container_platform 4.21","openshift_container_platform 4.22"],"published":"2026-09-01","updated":"2026-10-07","sourceUpdated":"2026-10-07T15:17:21.373","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-49329","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:74380","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:74383","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:74429","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:74434","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-49329","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2483248","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49329.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-49329"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49329"},{"url":"https://access.redhat.com/errata/RHSA-2026:79039","label":"RHSA-2026:79039"},{"url":"https://access.redhat.com/errata/RHSA-2026:82785","label":"RHSA-2026:82785"},{"url":"https://access.redhat.com/errata/RHSA-2026:82813","label":"RHSA-2026:82813"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-01T17:05:19.987171Z"},"epss":0.00705,"epssPercentile":0.53137,"ingestedAt":"2026-09-18T13:41:41.660Z","slug":"CVE-2026-49329","body":"## Overview\n\nA flaw was found in openshift/oauth-server. The OAuth login and error page endpoints pass the unauthenticated Accept-Language header to golang.org/x/text/language.ParseAcceptLanguage() without input validation. A bypass of the CVE-2022-32149 mitigation exists: the upstream guard counts only '-' characters but the internal BCP 47 scanner aliases '_' to '-' after the guard check. An unauthenticated attacker can send a crafted Accept-Language header using '_' separators to trigger quadratic-time parsing, consuming excessive CPU and denying authentication to all cluster users.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:74380** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.20 · released 2026-10-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:74380)\n- **RHSA-2026:74383** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.21 · released 2026-10-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:74383)\n- **RHSA-2026:74429** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.22 · released 2026-10-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:74429)\n- **Red Hat VEX** · Important · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49329.json)\n- **RHSA-2026:74434** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.19 · released 2026-10-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:74434)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}