Inefficient regular expression complexity in Graylog Forwarder and Graylog - #VU150168
Published: September 16, 2026
Vulnerability identifier: #VU150168
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-1333
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 inefficient regular expression complexity in the Palo Alto Networks input parser when processing a specially crafted syslog message. A remote attacker can send a specially crafted syslog message to consume excessive CPU and occupy a message processing thread to cause a denial of service.
Affected software
Graylog Forwarder
Graylog
Graylog
Remediation
Install security update from vendor's website.
Graylog Forwarder - update to 7.6
Graylog - addressed in versions 7.0.13, 7.1.9
Graylog - addressed in versions 7.0.13, 7.1.9