Envoy 1.12.0 allows a remote denial of service because of resource loops, as demonstrated…
Priority LOW 37CWE-835Published · Updated
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
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-835.
Summary
Envoy 1.12.0 allows a remote denial of service because of resource loops, as demonstrated by a single idle TCP connection being able to keep a worker thread in an infinite busy loop when continue_on_listener_filters_timeout is used."
Why it matters now
EPSS 0.01938 80th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet
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 · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:envoyproxy:envoy:1.12.0:*:*:*:*:*:*:* | 1.12.0 | Vulnerable | envoyproxy |
| cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:* | 1.3.0 – 1.3.3 | Vulnerable | istio |
- cpe:2.3:a:envoyproxy:envoy:1.12.0:*:*:*:*:*:*:* Versions 1.12.0 Vulnerable ·envoyproxy
- cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:* Versions 1.3.0 – 1.3.3 Vulnerable ·istio
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 1 product
- OpenShift Service Mesh 1
Timeline
- 2026-10-02 Threatist record created from CVE-2019-18836
- 2026-10-03 Alias added: GHSA-4r53-8549-7m3r
References
Sources
- CVE-2019-18836 · CVE Program
- CVE-2019-18836 · NVD
- FIRST EPSS
- GHSA-4r53-8549-7m3r · GitHub Advisory Database · CC BY 4.0
- CVE-2019-18836 · 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