---
title: "CVE-2026-61548: Rsyslog - Buffer Overflow"
description: "Rsyslog 7.5.4 to 8.2606.0 contains a stack buffer overflow caused by improper size handling in mmpstrucdata plugin's parseSD_PARAM function, letting remote unauthenticated attackers cause denial of service via crafted RFC5424 messages, exploit requires use of mmpstrucdata plugin and message size above threshold."
url: https://panop.io/threat-heartbeat/CVE-2026-61548/
---

# CVE-2026-61548 Rsyslog - Buffer Overflow

Rsyslog 7.5.4 to 8.2606.0 contains a stack buffer overflow caused by improper size handling in mmpstrucdata plugin's parseSD\_PARAM function, letting remote unauthenticated attackers cause denial of service via crafted RFC5424 messages, exploit requires use of mmpstrucdata plugin and message size above threshold.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.94% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-61548)

## Details

Type

Buffer Overflow

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

18 September 2026

Updated

15 October 2026

Weakness

[CWE-121](https://cwe.mitre.org/data/definitions/121.html)

## Vendor fix

Update to version 8.2606.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-61548](https://nvd.nist.gov/vuln/detail/CVE-2026-61548)
- [https://github.com/rsyslog/rsyslog/commit/bcda60a3692efdf0c8e44102528f5a0ebe0dec6d](https://github.com/rsyslog/rsyslog/commit/bcda60a3692efdf0c8e44102528f5a0ebe0dec6d)
- [https://github.com/rsyslog/rsyslog/pull/6991](https://github.com/rsyslog/rsyslog/pull/6991)
- [https://github.com/rsyslog/rsyslog/releases/tag/v8.2606.0](https://github.com/rsyslog/rsyslog/releases/tag/v8.2606.0)
- [https://github.com/rsyslog/rsyslog/security/advisories/GHSA-8qmr-c66f-g368](https://github.com/rsyslog/rsyslog/security/advisories/GHSA-8qmr-c66f-g368)
- [http://www.openwall.com/lists/oss-security/2026/07/20/1](http://www.openwall.com/lists/oss-security/2026/07/20/1)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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