{"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)","rsyslog7","rsyslog (all versions)","rsyslog (all versions)","rhel9/rsyslog (all versions)","rsyslog (all versions)"],"published":"2026-08-27","updated":"2026-09-22","sourceUpdated":"2026-09-22T04:17:58.567","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/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"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00655,"epssPercentile":0.49952,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-08-27T18:29:21.461066Z"},"ingestedAt":"2026-08-29T23:43:55.086Z","patched":["enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9"],"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 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8 · updated 2026-09-22 · [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)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}