High severity7.5NVD Advisory· Published Dec 13, 2019· Updated Jun 17, 2026
CVE-2019-18838
CVE-2019-18838
Description
An issue was discovered in Envoy 1.12.0. Upon receipt of a malformed HTTP request without a Host header, it sends an internally generated "Invalid request" response. This internally generated response is dispatched through the configured encoder filter chain before being sent to the client. An encoder filter that invokes route manager APIs that access a request's Host header causes a NULL pointer dereference, resulting in abnormal termination of the Envoy process.
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Affected products
3- Envoy/Envoydescription
Patches
Vulnerability mechanics
References
4- github.com/envoyproxy/envoy/commits/masternvdPatch
- github.com/envoyproxy/envoy/security/advisories/GHSA-f2rv-4w6x-rwhcnvdExploitThird Party Advisory
- blog.envoyproxy.ionvdProduct
- groups.google.com/forum/nvd
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