RHSA-2026:81321HighCVSS 7.5

Red Hat Security Advisory: rsyslog security, bug fix, and enhancement update

Published
October 12, 2026
Last Modified
October 19, 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 products159

  • Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-0:8.2412.0-1.el10_0.2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-0:8.2412.0-1.el10_0.2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-0:8.2412.0-1.el10_0.2.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-0:8.2412.0-1.el10_0.2.src as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-0:8.2412.0-1.el10_0.2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-crypto-0:8.2412.0-1.el10_0.2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-crypto-0:8.2412.0-1.el10_0.2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-crypto-0:8.2412.0-1.el10_0.2.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-crypto-0:8.2412.0-1.el10_0.2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-crypto-debuginfo-0:8.2412.0-1.el10_0.2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-crypto-debuginfo-0:8.2412.0-1.el10_0.2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-crypto-debuginfo-0:8.2412.0-1.el10_0.2.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-crypto-debuginfo-0:8.2412.0-1.el10_0.2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-debuginfo-0:8.2412.0-1.el10_0.2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-debuginfo-0:8.2412.0-1.el10_0.2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-debuginfo-0:8.2412.0-1.el10_0.2.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-debuginfo-0:8.2412.0-1.el10_0.2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-debugsource-0:8.2412.0-1.el10_0.2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-debugsource-0:8.2412.0-1.el10_0.2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-debugsource-0:8.2412.0-1.el10_0.2.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-debugsource-0:8.2412.0-1.el10_0.2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-doc-0:8.2412.0-1.el10_0.2.noarch as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-elasticsearch-0:8.2412.0-1.el10_0.2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-elasticsearch-0:8.2412.0-1.el10_0.2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-elasticsearch-0:8.2412.0-1.el10_0.2.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-elasticsearch-0:8.2412.0-1.el10_0.2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-elasticsearch-debuginfo-0:8.2412.0-1.el10_0.2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-elasticsearch-debuginfo-0:8.2412.0-1.el10_0.2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • rsyslog-elasticsearch-debuginfo-0:8.2412.0-1.el10_0.2.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • +129 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 (5)