RHSA-2026:90349HighCVSS 7.5

Red Hat Security Advisory: rsyslog security update

Published
October 26, 2026
Last Modified
October 26, 2026

🔗 CVE IDs covered (1)

CVE-2026-78002 →

📋 Description

CVE-2026-78002 — rsyslog: rsyslog: Denial of service via heap buffer overflow in RainerScript replace() function

🎯 Affected products163

  • Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-0:8.2310.0-4.el9_4.2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-0:8.2310.0-4.el9_4.2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-0:8.2310.0-4.el9_4.2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-0:8.2310.0-4.el9_4.2.src as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-0:8.2310.0-4.el9_4.2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-crypto-0:8.2310.0-4.el9_4.2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-crypto-0:8.2310.0-4.el9_4.2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-crypto-0:8.2310.0-4.el9_4.2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-crypto-0:8.2310.0-4.el9_4.2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-crypto-debuginfo-0:8.2310.0-4.el9_4.2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-crypto-debuginfo-0:8.2310.0-4.el9_4.2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-crypto-debuginfo-0:8.2310.0-4.el9_4.2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-crypto-debuginfo-0:8.2310.0-4.el9_4.2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-debuginfo-0:8.2310.0-4.el9_4.2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-debuginfo-0:8.2310.0-4.el9_4.2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-debuginfo-0:8.2310.0-4.el9_4.2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-debuginfo-0:8.2310.0-4.el9_4.2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-debugsource-0:8.2310.0-4.el9_4.2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-debugsource-0:8.2310.0-4.el9_4.2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-debugsource-0:8.2310.0-4.el9_4.2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-debugsource-0:8.2310.0-4.el9_4.2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-doc-0:8.2310.0-4.el9_4.2.noarch as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-elasticsearch-0:8.2310.0-4.el9_4.2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-elasticsearch-0:8.2310.0-4.el9_4.2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-elasticsearch-0:8.2310.0-4.el9_4.2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-elasticsearch-0:8.2310.0-4.el9_4.2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-elasticsearch-debuginfo-0:8.2310.0-4.el9_4.2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-elasticsearch-debuginfo-0:8.2310.0-4.el9_4.2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • rsyslog-elasticsearch-debuginfo-0:8.2310.0-4.el9_4.2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • +133 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: To mitigate this vulnerability, restrict network access to the rsyslog service to only trusted hosts. This can be achieved by configuring firewall rules to limit incoming connections to UDP and TCP port 514. Alternatively, if remote syslog reception is not required, disable the `imudp` and `imtcp` modules in the `/etc/rsyslog.conf` configuration file. After modifying the rsyslog configuration or firewall rules, the rsyslog service or firewall service must be restarted for the changes to take effect.

🔗 References (4)