NULL pointer dereference in envoy - #VU153340
Published: October 6, 2026
Vulnerability identifier: #VU153340
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-476
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 a null pointer dereference in the OAuth2 HTTP filter when processing a path-less HTTP CONNECT request. A remote attacker can send a path-less HTTP CONNECT request to cause a denial of service.
Exploitation requires reaching a listener whose HTTP filter chain includes the OAuth2 filter.
Affected software
envoy
Remediation
Install security update from vendor's website.
envoy - addressed in versions 1.36.12, 1.37.8, 1.38.6, 1.39.3