An issue was discovered in Envoy 1.12.0.
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-476.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* | up to 1.12.1 | Vulnerable | envoyproxy |
- cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* Versions up to 1.12.1 Vulnerable ·envoyproxy
Remediation
Red Hat 1 advisory
- RHSA-2019:4222 Released 2019-12-11 · Red Hat rating CriticalRed Hat OpenShift Service Mesh 1.0.3 RPMs security update
- OpenShift Service Mesh 1.0 servicemesh-1.0.3-1.el8, servicemesh-citadel-1.0.3-1.el8, servicemesh-cni-1.0.3-1.el8 +12
- Red Hat OpenShift Service Mesh 1.0 kiali-v1.0.8.redhat1-1.el7
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| OpenShift Service Mesh 1.0 | Fixed | RHSA-2019:4222 |
| Red Hat OpenShift Service Mesh 1.0 | Fixed | RHSA-2019:4222 |
Timeline
- 2026-10-02 Threatist record created from CVE-2019-18838
- 2026-10-03 Alias added: GHSA-m3j5-qf4q-m73w
References
More envoyproxy Envoy vulnerabilities
- TI-2026-79288 Out-of-bounds write in Google Brotli decoder KEVCVSS 4.0CRITICAL 9.2
- TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
- TI-2024-20001 HTTP/2: CPU exhaustion due to CONTINUATION frame flood CVSS 3.1HIGH 7.5
- TI-2024-18524 HTTP/2: memory exhaustion due to CONTINUATION frame flood CVSS 3.1HIGH 7.5
- TI-2023-12215 Envoy client may fake the header `x-envoy-original-path` CVSS 3.1CRITICAL 9.1
- TI-2023-18002 Envoy vulnerable to OAuth2 credentials exploit with permanent validity CVSS 3.1CRITICAL 9.8
Sources
- CVE-2019-18838 · CVE Program
- CVE-2019-18838 · NVD
- FIRST EPSS
- GHSA-m3j5-qf4q-m73w · GitHub Advisory Database · CC BY 4.0
- CVE-2019-18838 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences