{"id":"CVE-2026-103119","title":"tomcat: Apache Tomcat: Information disclosure via buffer under-read during non-blocking writes (CVE-2026-103119)","summary":"A flaw was found in Apache Tomcat. During large non-blocking write operations, a buffer under-read can cause an HTTP response body to be split between the current request and the subsequent request handled on the same connection. A remote …","severity":"medium","cvss":4.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L","cvssSource":"vendor","cwe":["CWE-125","CWE-127"],"vendor":"Red Hat","product":"Red Hat Hardened Images","affected":["hardened_images"],"patched":["hardened_images"],"published":"2026-10-20","updated":"2026-10-20","sourceUpdated":"2026-10-20T23:30:36+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103119.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103119.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-103119"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2556195"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-103119"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-103119"},{"url":"https://lists.apache.org/thread.html/sk2cg4k077fwcqbm6tqz2n700nq06h80"},{"url":"https://access.redhat.com/errata/RHSA-2026:85926"},{"url":"https://access.redhat.com/errata/RHSA-2026:81365"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-20T15:41:16.526893Z"},"scores":{"vendor":4.8,"adp":9.1},"ingestedAt":"2026-10-20T14:08:00.566Z","slug":"CVE-2026-103119","body":"## Overview\n\nA flaw was found in Apache Tomcat. During large non-blocking write operations, a buffer under-read can cause an HTTP response body to be split between the current request and the subsequent request handled on the same connection. A remote user sending a follow-up request could receive sensitive data intended for the prior response, leading to information disclosure. This issue can also cause the subsequent request to fail, resulting in a denial of service (DoS).\n\n## Vendor advisories\n\n- **RHSA-2026:85926** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85926)\n- **RHSA-2026:81365** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:81365)\n\n**tomcat: Apache Tomcat: Information disclosure via buffer under-read during non-blocking writes** — rated Moderate by Red Hat. Released 2026-10-20.\n\nFixed:\n\n- Red Hat Hardened Images\n\n## Remediation\n\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:85926\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:81365","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":26.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":227165,"id":"CVE-2026-103119","ts":1792585174347,"field":"cvss","old":"9.1","new":"4.8"},{"seq":227164,"id":"CVE-2026-103119","ts":1792585174347,"field":"severity","old":"critical","new":"medium"},{"seq":225959,"id":"CVE-2026-103119","ts":1792512699115,"field":"cvss","old":null,"new":"9.1"},{"seq":225958,"id":"CVE-2026-103119","ts":1792512699115,"field":"severity","old":"none","new":"critical"}]}