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 ↗

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

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

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