{"id":"CVE-2026-91396","title":"openjdk: Improve Pack200 handling (Oracle CPU 2026-10) (CVE-2026-91396)","summary":"A flaw was found in the Utility component of OpenJDK. An unauthenticated remote attacker can exploit this vulnerability by supplying untrusted data to component APIs over the network. A successful attack can allow unauthorized modification…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","cvssSource":"vendor","cwe":"CWE-22","vendor":"Red Hat","product":"Red Hat Enterprise Linux 7","affected":["build_of_openjdk 1.8","build_of_openjdk_11_els","enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9"],"published":"2026-10-20","updated":"2026-10-22","sourceUpdated":"2026-10-22T22:00:47+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91396.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91396.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-91396"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2557097"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-91396"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91396"},{"url":"https://www.oracle.com/security-alerts/cpuoct2026.html"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00333,"epssPercentile":0.26336,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-22T18:46:44.714708Z"},"ingestedAt":"2026-10-20T22:23:33.777Z","slug":"CVE-2026-91396","body":"## Overview\n\nA flaw was found in the Utility component of OpenJDK. An unauthenticated remote attacker can exploit this vulnerability by supplying untrusted data to component APIs over the network. A successful attack can allow unauthorized modification or deletion of accessible data and cause a partial Denial of Service (DoS).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat build of OpenJDK 1.8, Red Hat build of OpenJDK 11 ELS, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat build of OpenJDK 1.8, Red Hat build of OpenJDK 11 ELS, … · updated 2026-10-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91396.json)\n\n**openjdk: Improve Pack200 handling (Oracle CPU 2026-10)** — rated Moderate by Red Hat. Released 2026-10-20, updated 2026-10-22.\n\nAffected:\n\n- Red Hat build of OpenJDK 1.8\n- Red Hat build of OpenJDK 11 ELS\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat build of OpenJDK 1.8\n- Red Hat build of OpenJDK 11 ELS\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n\nNot affected:\n\n- Red Hat build of OpenJDK 17\n- Red Hat build of OpenJDK 21\n- Red Hat build of OpenJDK 25\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat Hardened Images\n\n## Remediation\n\nOut of support scope","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}