# CVE-2026-19654: Rsyslog: a configuration-dependent issue in rsyslog's optional imptcp input module can allow an unauthenticated remote peer to crash rsyslogd Status: published. Published: 2026-08-12. Updated: 2026-11-05. 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. ## Remediation - workaround: To mitigate this issue, users that are relying on the imptcp module can implement one of the following options: 1) Remove the framing.delimiter.regex from the affected 2) Disabled the affected `imptcp` listener or unload `imptcp` if it's not required 3) Restrict the network access to the listener to trusted senders only (source: CNA: redhat) ## Affected products and versions - Red Hat / Red Hat Enterprise Linux 10 (rsyslog): ≥ 0:8.2510.0-5.el10_2.1; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support (rsyslog): ≥ 0:8.2412.0-1.el10_0.1; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 8 (rsyslog): ≥ 0:8.2102.0-15.el8_10.3; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (rsyslog): ≥ 0:8.1911.0-7.el8_4.5; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On (rsyslog): ≥ 0:8.1911.0-7.el8_4.5; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (rsyslog): ≥ 0:8.2102.0-7.el8_6.2; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (rsyslog): ≥ 0:8.2102.0-7.el8_6.2; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service (rsyslog): ≥ 0:8.2102.0-13.el8_8.1; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (rsyslog): ≥ 0:8.2102.0-13.el8_8.1; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 9 (rsyslog): ≥ 0:8.2510.0-2.el9_8.1; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (rsyslog): ≥ 0:8.2102.0-113.el9_2.3; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions (rsyslog): ≥ 0:8.2310.0-4.el9_4.1; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support (rsyslog): ≥ 0:8.2412.0-1.el9_6.2; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Update Infrastructure 5 (rhui5/haproxy-rhel9): ≥ 1790241900; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 6 (rsyslog): Version range not reported. Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 6 (rsyslog7): Version range not reported. Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 7 (rsyslog): Version range not reported. Source: CNA: redhat ## NVD configuration conditions Affected CPE matches depend on the following AND/OR and negation conditions: ```json [ { "negate": false, "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:rsyslog:rsyslog:*:*:*:*:*:*:*:*", "versionEndExcluding": "8.2608.0", "versionStartIncluding": "8.36.0", "vulnerable": true }, { "criteria": "cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*", "vulnerable": true } ], "negate": false, "operator": "OR" } ], "operator": "OR" } ] ``` ## Severity and prioritization - CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat - CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: secalert@redhat.com - CISA KEV: No listing in collected sources - EPSS: 0.77% as of 2026-11-05; percentile 55.82% - SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP - Weaknesses: CWE-125 ## Exploit evidence No exploit evidence in collected sources. This is not proof of no exploitation. ## References - https://access.redhat.com/errata/RHSA-2026:66405 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/errata/RHSA-2026:67583 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/errata/RHSA-2026:67584 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/errata/RHSA-2026:71603 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/errata/RHSA-2026:80817 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/errata/RHSA-2026:84571 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/errata/RHSA-2026:84576 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/errata/RHSA-2026:86124 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/errata/RHSA-2026:87408 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/errata/RHSA-2026:91582 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/errata/RHSA-2026:95573 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/security/cve/CVE-2026-19654 (CNA: redhat; vdb-entry, x_refsource_REDHAT) - https://bugzilla.redhat.com/show_bug.cgi?id=2502868 (CNA: redhat; issue-tracking, x_refsource_REDHAT) - https://github.com/rsyslog/rsyslog/security/advisories/GHSA-cj5r-wh2m-7w29 (CNA: redhat) - https://access.redhat.com/errata/RHSA-2026:66405 (secalert@redhat.com) - https://access.redhat.com/errata/RHSA-2026:67583 (secalert@redhat.com) - https://access.redhat.com/errata/RHSA-2026:67584 (secalert@redhat.com) - https://access.redhat.com/errata/RHSA-2026:71603 (secalert@redhat.com) - https://access.redhat.com/errata/RHSA-2026:80817 (secalert@redhat.com) - https://access.redhat.com/errata/RHSA-2026:84571 (secalert@redhat.com) - https://access.redhat.com/errata/RHSA-2026:84576 (secalert@redhat.com) - https://access.redhat.com/errata/RHSA-2026:86124 (secalert@redhat.com) - https://access.redhat.com/errata/RHSA-2026:87408 (secalert@redhat.com) - https://access.redhat.com/errata/RHSA-2026:91582 (secalert@redhat.com) - https://access.redhat.com/security/cve/CVE-2026-19654 (secalert@redhat.com; Third Party Advisory) - https://bugzilla.redhat.com/show_bug.cgi?id=2502868 (secalert@redhat.com; Issue Tracking, Third Party Advisory) - https://github.com/rsyslog/rsyslog/security/advisories/GHSA-cj5r-wh2m-7w29 (secalert@redhat.com; Vendor Advisory) ## Provenance - CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-19654; retrieved 2026-11-05; source updated 2026-11-05 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-19654; retrieved 2026-11-05; source updated 2026-11-04 - FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-19654; retrieved 2026-11-05; source updated Not reported Revision: a436c0af09f119df827e226e825174d42f401cabc1c2003a2332dcbf2abe3a28 Canonical: https://y2.dev/cve/CVE-2026-19654 ## Agent and API access Public CVE pages, Markdown, and JSON are free to read without an account or API key. - Public catalog: https://y2.dev/cve/index.json. 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