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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 size calculation during string replacement, causing memory corruption. Successful exploitation can lead to a denial of service (DoS) for the affected system.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade rsyslog-logrotateUpgrade rsyslog-kafkaUpgrade rsyslog-elasticsearchUpgrade rsyslogUpgrade rsyslog-gssapiUpgrade rsyslog-cryptoUpgrade rsyslog-opensslUpgrade rsyslog-pgsqlUpgrade rsyslog-mysqlUpgrade rsyslog-mmkubernetesUpgrade rsyslog-snmpUpgrade rsyslog-mmsnmptrapdUpgrade rsyslog-mmnormalizeUpgrade rsyslog-mmjsonparseUpgrade rsyslog-omamqp1Upgrade rsyslog-gnutlsUpgrade rsyslog-relpUpgrade rsyslog-docUpgrade rsyslog-mmauditUpgrade rsyslog-udpspoofUpgrade rsyslog-mmfields | Oct 11, 2026 | Sep 21, 2026 |
| Amazon Linux Ami 2 | — | Upgrade rsyslog-mmauditUpgrade rsyslog-gssapiUpgrade rsyslog-cryptoUpgrade rsyslog-pgsqlUpgrade rsyslog-snmpUpgrade rsyslog-kafkaUpgrade rsyslogUpgrade rsyslog-elasticsearchUpgrade rsyslog-mmsnmptrapdUpgrade rsyslog-gnutlsUpgrade rsyslog-docUpgrade rsyslog-mmnormalizeUpgrade rsyslog-libdbiUpgrade rsyslog-mysqlUpgrade rsyslog-udpspoofUpgrade rsyslog-debuginfoUpgrade rsyslog-mmjsonparseUpgrade rsyslog-mmkubernetesUpgrade rsyslog-relp | Oct 19, 2026 | Oct 19, 2026 |
| Amazon_linux_2023 | — | Upgrade rsyslog-mmnormalize-debuginfoUpgrade rsyslog-debugsourceUpgrade rsyslog-mmaudit-debuginfoUpgrade rsyslog-logrotateUpgrade rsyslog-mmfieldsUpgrade rsyslog-docUpgrade rsyslog-mmjsonparseUpgrade rsyslog-mmauditUpgrade rsyslog-elasticsearch-debuginfoUpgrade rsyslog-cryptoUpgrade rsyslog-openssl-debuginfoUpgrade rsyslog-mmkubernetes-debuginfoUpgrade rsyslog-mmfields-debuginfoUpgrade rsyslog-mmnormalizeUpgrade rsyslog-mmtaghostnameUpgrade rsyslog-mmkubernetesUpgrade rsyslog-mmjsonparse-debuginfoUpgrade rsyslog-elasticsearchUpgrade rsyslogUpgrade rsyslog-opensslUpgrade rsyslog-mmtaghostname-debuginfoUpgrade rsyslog-debuginfoUpgrade rsyslog-crypto-debuginfo | Sep 30, 2026 | Aug 27, 2026 |
| Debian | — | Upgrade rsyslog | Sep 21, 2026 | Aug 27, 2026 |
| Ibm Aix | — | Apply the fix or workaround for rsyslog_advisory2 | Oct 15, 2026 | Oct 8, 2026 |
| Oracle_linux | — | Upgrade rsyslog-pgsqlUpgrade rsyslogUpgrade rsyslog-gnutlsUpgrade rsyslog-mmkubernetesUpgrade rsyslog-omamqp1Upgrade rsyslog-opensslUpgrade rsyslog-cryptoUpgrade rsyslog-snmpUpgrade rsyslog-elasticsearchUpgrade rsyslog-mysqlUpgrade rsyslog-mmauditUpgrade rsyslog-gssapiUpgrade rsyslog-kafkaUpgrade rsyslog-mmnormalizeUpgrade rsyslog-mmjsonparseUpgrade rsyslog-mmfieldsUpgrade rsyslog-relpUpgrade rsyslog-udpspoofUpgrade rsyslog-logrotateUpgrade rsyslog-mmsnmptrapdUpgrade rsyslog-doc | Oct 22, 2026 | Aug 27, 2026 |
| Redhat_linux | — | Upgrade rsyslog-debuginfoUpgrade rsyslog-logrotateUpgrade rsyslog-mmsnmptrapd-debuginfoUpgrade rsyslog-omamqp1Upgrade rsyslog-docUpgrade rsyslog-mmkubernetes-debuginfoUpgrade rsyslog-snmpNo solution existsUpgrade rsyslog-openssl-debuginfoUpgrade rsyslog-mmjsonparseUpgrade rsyslog-gssapi-debuginfoUpgrade rsyslog-pgsql-debuginfoUpgrade rsyslog-mmauditUpgrade rsyslog-mysqlUpgrade rsyslog-relpUpgrade rsyslog-udpspoofUpgrade rsyslog-snmp-debuginfoUpgrade rsyslog-gnutls-debuginfoUpgrade rsyslog-kafka-debuginfoUpgrade rsyslog-crypto-debuginfoUpgrade rsyslog-pgsqlUpgrade rsyslog-mmnormalize-debuginfoUpgrade rsyslog-relp-debuginfoUpgrade rsyslog-mmkubernetesUpgrade rsyslog-mmaudit-debuginfoUpgrade rsyslog-gnutlsUpgrade rsyslog-elasticsearchUpgrade rsyslog-cryptoUpgrade rsyslog-mmjsonparse-debuginfoUpgrade rsyslog-udpspoof-debuginfoUpgrade rsyslog-kafkaUpgrade rsyslog-omamqp1-debuginfoUpgrade rsyslog-mmfieldsUpgrade rsyslog-elasticsearch-debuginfoUpgrade rsyslog-mmfields-debuginfoUpgrade rsyslog-mmsnmptrapdUpgrade rsyslog-mysql-debuginfoUpgrade rsyslog-mmnormalizeUpgrade rsyslog-opensslUpgrade rsyslogUpgrade rsyslog-debugsourceUpgrade rsyslog-gssapi | Aug 31, 2026 | Aug 26, 2026 |
| Rocky_linux | — | Upgrade rsyslog-elasticsearch-debuginfoUpgrade rsyslog-relp-debuginfoUpgrade rsyslog-gssapiUpgrade rsyslog-snmp-debuginfoUpgrade rsyslog-mysqlUpgrade rsyslog-logrotateUpgrade rsyslog-mmnormalize-debuginfoUpgrade rsyslog-mmkubernetes-debuginfoUpgrade rsyslog-pgsqlUpgrade rsyslog-udpspoofUpgrade rsyslog-mmfields-debuginfoUpgrade rsyslog-mmauditUpgrade rsyslog-kafkaUpgrade rsyslog-mmkubernetesUpgrade rsyslog-gnutlsUpgrade rsyslog-crypto-debuginfoUpgrade rsyslog-kafka-debuginfoUpgrade rsyslog-mysql-debuginfoUpgrade rsyslog-omamqp1Upgrade rsyslog-openssl-debuginfoUpgrade rsyslog-mmnormalizeUpgrade rsyslog-relpUpgrade rsyslog-mmsnmptrapd-debuginfoUpgrade rsyslog-mmjsonparse-debuginfoUpgrade rsyslog-elasticsearchUpgrade rsyslog-opensslUpgrade rsyslog-mmfieldsUpgrade rsyslog-omamqp1-debuginfoUpgrade rsyslog-debugsourceUpgrade rsyslogUpgrade rsyslog-udpspoof-debuginfoUpgrade rsyslog-gssapi-debuginfoUpgrade rsyslog-gnutls-debuginfoUpgrade rsyslog-debuginfoUpgrade rsyslog-mmsnmptrapdUpgrade rsyslog-cryptoUpgrade rsyslog-snmpUpgrade rsyslog-mmaudit-debuginfoUpgrade rsyslog-pgsql-debuginfoUpgrade rsyslog-mmjsonparse | Sep 28, 2026 | Sep 23, 2026 |
| Ubuntu | — | Upgrade rsyslog (Ubuntu Pro)Upgrade rsyslog | Sep 21, 2026 | Aug 27, 2026 |
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