{"id":"CVE-2026-78002","title":"A flaw was found in rsyslog","summary":"A flaw was found in rsyslog. An unauthenticated remote attacker can trigger a heap buffer overflow in the RainerScript `replace()` function by sending specially crafted syslog messages. This vulnerability arises from an incorrect buffer …","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-131"],"vendor":"Red Hat","product":"rsyslog","affected":["rsyslog (all versions)","rsyslog (all versions)","rhui5/haproxy-rhel9 (all versions)","rsyslog (all versions)","rsyslog7","rsyslog (all versions)","rsyslog (all versions)"],"patched":["enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9"],"published":"2026-08-27","updated":"2026-10-12","sourceUpdated":"2026-10-12T20:17:10.130","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-78002","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:69540","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:69541","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:71603","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:80817","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:81321","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-78002","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2521135","label":"secalert@redhat.com"},{"url":"https://github.com/rsyslog/rsyslog/security/advisories/GHSA-g72f-gc6v-f2w3","label":"secalert@redhat.com"},{"url":"http://www.openwall.com/lists/oss-security/2026/08/29/1","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-78002.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-78002"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-78002"},{"url":"https://access.redhat.com/errata/RHSA-2026:84576","label":"RHSA-2026:84576"},{"url":"https://access.redhat.com/errata/RHSA-2026:86124","label":"RHSA-2026:86124"},{"url":"https://access.redhat.com/errata/RHSA-2026:87408","label":"RHSA-2026:87408"},{"url":"https://access.redhat.com/errata/RHSA-2026:90349","label":"RHSA-2026:90349"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.01064,"epssPercentile":0.64486,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-08-27T18:29:21.461066Z"},"ingestedAt":"2026-08-29T23:43:55.086Z","slug":"CVE-2026-78002","body":"## Overview\n\nA flaw was found in rsyslog. An unauthenticated remote attacker can trigger a heap buffer overflow in the RainerScript `replace()` function by sending specially crafted syslog messages. This vulnerability arises from an incorrect buffer size calculation during string replacement, causing memory corruption. Successful exploitation can lead to a denial of service (DoS) for the affected system.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 7 · updated 2026-10-19 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-78002.json)\n- **RHSA-2026:69541** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69541)\n- **RHSA-2026:69540** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-09-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:69540)\n- **RHSA-2026:71603** · Red Hat · fixed in: Red Hat Update Infrastructure 5 · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:71603)\n- **RHSA-2026:81321** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-10-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:81321)\n- **RHSA-2026:80817** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-10-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:80817)\n- **RHSA-2026:84576** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84576)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}