CVE-2026-19654: Rsyslog: a configuration-dependent issue in rsyslog's optional imptcp input module can allow an unauthenticated remote peer to crash rsyslogd

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-12 · updated 2026-10-30
Weakness: CWE-125

Description

A unauthenticated remote peer may lead rsyslogd to crash due to a flaw in the optional imptcp module. A crafted input sequence during oversize-frame recovery can cause an invalid internal message length and terminate rsyslogd. No confidentiality or integrity impact, privilege escalation, or code execution has been identified. imtcp and the default imptcp framing modes are not affected.

Affected products

Red Hat Enterprise Linux: 6.0, 7.0, 8.0, 9.0, 10.0 (and their updates)
rsyslog: from 8.36.0 before 8.2608.0 — fixed in 8.2608.0
Red Hat Enterprise Linux 10: all versions — fixed in 0:8.2510.0-5.el10_2.1
Red Hat Enterprise Linux 10.0 Extended Update Support: all versions — fixed in 0:8.2412.0-1.el10_0.1
Red Hat Enterprise Linux 8: all versions — fixed in 0:8.2102.0-15.el8_10.3
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: all versions — fixed in 0:8.2102.0-7.el8_6.2
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On: all versions — fixed in 0:8.2102.0-7.el8_6.2
Red Hat Enterprise Linux 8.8 Telecommunications Update Service: all versions — fixed in 0:8.2102.0-13.el8_8.1
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions: all versions — fixed in 0:8.2102.0-13.el8_8.1
Red Hat Enterprise Linux 9: all versions — fixed in 0:8.2510.0-2.el9_8.1
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: all versions — fixed in 0:8.2102.0-113.el9_2.3
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions: all versions — fixed in 0:8.2310.0-4.el9_4.1
Red Hat Enterprise Linux 9.6 Extended Update Support: all versions — fixed in 0:8.2412.0-1.el9_6.2
Red Hat Update Infrastructure 5: all versions — fixed in 1790241900

How to fix

Upgrade to a fixed version: rsyslog 8.2608.0; Red Hat Enterprise Linux 10 0:8.2510.0-5.el10_2.1; Red Hat Enterprise Linux 10.0 Extended Update Support 0:8.2412.0-1.el10_0.1; Red Hat Enterprise Linux 8 0:8.2102.0-15.el8_10.3; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:8.2102.0-7.el8_6.2; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:8.2102.0-7.el8_6.2; Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:8.2102.0-13.el8_8.1; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:8.2102.0-13.el8_8.1; Red Hat Enterprise Linux 9 0:8.2510.0-2.el9_8.1; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:8.2102.0-113.el9_2.3; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:8.2310.0-4.el9_4.1; Red Hat Enterprise Linux 9.6 Extended Update Support 0:8.2412.0-1.el9_6.2. Check the vendor advisory for mitigations.

References

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