Buffer Overflow The advisory has been revoked - it doesn't affect any version of package rsyslog-openssl (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL10-RSYSLOGOPENSSL-20068248
- published24 Sept 2026
- disclosed18 Sept 2026
Introduced: 18 Sep 2026
NewCVE-2026-61548 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream rsyslog-openssl package and not the rsyslog-openssl package as distributed by RHEL.
Rsyslog is a rocket-fast system for log processing. From 7.5.4 until 8.2606.0, the optional mmpstrucdata plugin's parseSD_PARAM function in plugins/mmpstrucdata/mmpstrucdata.c stores RFC5424 parameter values in a fixed pVal[32 * 1024] stack buffer and calls parsePARAM_VALUE without supplying the destination size. A remote unauthenticated attacker whose crafted RFC5424 message reaches an action using mmpstrucdata can provide a structured-data parameter larger than that buffer when MaxMessageSize permits it, causing an attacker-controlled stack overwrite. Deployments that do not install and use the plugin, or whose effective message-size limit remains below the required threshold, are not affected by this issue. The demonstrated impact is a crash and interruption of log collection; code execution is not demonstrated. This issue is fixed in version 8.2606.0.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2538148
- https://access.redhat.com/security/cve/CVE-2026-61548
- https://github.com/rsyslog/rsyslog/commit/bcda60a3692efdf0c8e44102528f5a0ebe0dec6d
- https://github.com/rsyslog/rsyslog/pull/6991
- https://github.com/rsyslog/rsyslog/releases/tag/v8.2606.0
- https://github.com/rsyslog/rsyslog/security/advisories/GHSA-8qmr-c66f-g368
- http://www.openwall.com/lists/oss-security/2026/07/20/1