NULL pointer dereference in envoy - #VU153339
Published: October 6, 2026
Vulnerability identifier: #VU153339
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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 user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in KeySources::Source::removeKey in the api_key_auth HTTP filter when stripping a query key source from a request without a :path header. A remote user can send a path-less CONNECT request with a valid API key to cause a denial of service.
Exploitation requires forwarding.hide_credentials to be enabled and at least two key sources to be configured, including a query key source.
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