Upon receiving each incoming request header data, Envoy will iterate over existing…
Priority HIGH 69CWE-400Published · 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 and Red Hat. Impact type from CWE-400.
Summary
Upon receiving each incoming request header data, Envoy will iterate over existing request headers to verify that the total size of the headers stays below a maximum limit. The implementation in versions 1.10.0 through 1.11.1 for HTTP/1.x traffic and all versions of Envoy for HTTP/2 traffic had O(n^2) performance characteristics. A remote attacker may craft a request that stays below the maximum request header size but consists of many thousands of small headers to consume CPU and result in a denial-of-service attack.
Why it matters now
EPSS 0.64517 99th percentileScored 2026-11-07
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 · 16
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:envoyproxy:envoy:1.0.0:*:*:*:*:*:*:* | 1.0.0 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.1.0:*:*:*:*:*:*:* | 1.1.0 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.2.0:*:*:*:*:*:*:* | 1.2.0 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.3.0:*:*:*:*:*:*:* | 1.3.0 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.4.0:*:*:*:*:*:*:* | 1.4.0 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.5.0:*:*:*:*:*:*:* | 1.5.0 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.6.0:*:*:*:*:*:*:* | 1.6.0 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.7.0:*:*:*:*:*:*:* | 1.7.0 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.7.1:*:*:*:*:*:*:* | 1.7.1 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.8.0:*:*:*:*:*:*:* | 1.8.0 | Vulnerable | envoyproxy |
- cpe:2.3:a:envoyproxy:envoy:1.0.0:*:*:*:*:*:*:* Versions 1.0.0 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.1.0:*:*:*:*:*:*:* Versions 1.1.0 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.2.0:*:*:*:*:*:*:* Versions 1.2.0 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.3.0:*:*:*:*:*:*:* Versions 1.3.0 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.4.0:*:*:*:*:*:*:* Versions 1.4.0 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.5.0:*:*:*:*:*:*:* Versions 1.5.0 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.6.0:*:*:*:*:*:*:* Versions 1.6.0 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.7.0:*:*:*:*:*:*:* Versions 1.7.0 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.7.1:*:*:*:*:*:*:* Versions 1.7.1 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.8.0:*:*:*:*:*:*:* Versions 1.8.0 Vulnerable ·envoyproxy
Show 6 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:envoyproxy:envoy:1.9.0:*:*:*:*:*:*:* | 1.9.0 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.9.1:*:*:*:*:*:*:* | 1.9.1 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.10.0:*:*:*:*:*:*:* | 1.10.0 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.11.0:*:*:*:*:*:*:* | 1.11.0 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.11.1:*:*:*:*:*:*:* | 1.11.1 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.11.2:*:*:*:*:*:*:* | 1.11.2 | Vulnerable | envoyproxy |
- cpe:2.3:a:envoyproxy:envoy:1.9.0:*:*:*:*:*:*:* Versions 1.9.0 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.9.1:*:*:*:*:*:*:* Versions 1.9.1 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.10.0:*:*:*:*:*:*:* Versions 1.10.0 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.11.0:*:*:*:*:*:*:* Versions 1.11.0 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.11.1:*:*:*:*:*:*:* Versions 1.11.1 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.11.2:*:*:*:*:*:*:* Versions 1.11.2 Vulnerable ·envoyproxy
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| OpenShift Service Mesh 1 | Affected | No fix yet |
Timeline
- 2026-10-02 Threatist record created from CVE-2019-15226
- 2026-10-03 Alias added: GHSA-cggr-h689-7v7x
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-2019-15226 · CVE Program
- CVE-2019-15226 · NVD
- FIRST EPSS
- GHSA-cggr-h689-7v7x · GitHub Advisory Database · CC BY 4.0
- CVE-2019-15226 · 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