Allocation of Resources Without Limits or Throttling in Fluentd - #VU152737
Published: September 29, 2026
Vulnerability identifier: #VU152737
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in the in_syslog TCP and TLS handlers when processing incomplete syslog message streams. A remote attacker can send a crafted unterminated stream or declare an incomplete oversized frame to cause a denial of service.
The issue affects TCP and TLS transports using traditional or octet-count framing.
Affected software
Fluentd
Remediation
Install security update from vendor's website.
Fluentd - update to 1.19.4