CVE-2026-47204: CWE-476: NULL Pointer Dereference in envoyproxy envoy
A null pointer dereference vulnerability exists in the envoy.filters.http.grpc_stats filter of Envoy proxy versions from 1.26.0 up to but not including 1.35.13, 1.36.9, 1.37.5, and 1.38.3. This occurs when a Connect protocol request with specific content types hits a direct_response route, causing the Envoy process to crash. The vulnerability allows an unauthenticated attacker to cause a denial of service by sending a single HTTP request. Fixes are available in versions 1.35.13, 1.36.9, 1.37.5, and 1.38.3.
AI Analysis
Technical Summary
Envoy proxy versions starting from 1.26.0 up to but excluding 1.35.13, 1.36.9, 1.37.5, and 1.38.3 contain a null pointer dereference vulnerability in the envoy.filters.http.grpc_stats filter. When a Connect protocol request (Content-Type: application/connect+proto or application/connect+json) targets a direct_response route, the filter crashes due to a null pointer dereference, resulting in a segmentation fault and process crash. This vulnerability can be triggered by a single unauthenticated HTTP request, leading to denial of service. The issue is addressed in the specified fixed versions.
Potential Impact
An unauthenticated attacker can cause the Envoy process to crash by sending a specially crafted HTTP request, resulting in denial of service. There is no impact on confidentiality or integrity according to the CVSS vector. The availability impact is high due to process crash.
Mitigation Recommendations
Fixed versions 1.35.13, 1.36.9, 1.37.5, and 1.38.3 address this vulnerability. Users should upgrade to one of these versions to remediate the issue. Patch status is confirmed by the version fixes stated in the description. No other mitigation or temporary workaround is indicated.
CVE-2026-47204: CWE-476: NULL Pointer Dereference in envoyproxy envoy
Description
A null pointer dereference vulnerability exists in the envoy.filters.http.grpc_stats filter of Envoy proxy versions from 1.26.0 up to but not including 1.35.13, 1.36.9, 1.37.5, and 1.38.3. This occurs when a Connect protocol request with specific content types hits a direct_response route, causing the Envoy process to crash. The vulnerability allows an unauthenticated attacker to cause a denial of service by sending a single HTTP request. Fixes are available in versions 1.35.13, 1.36.9, 1.37.5, and 1.38.3.
CVSS v3.1
Score 6.5medium
Affected software
pkg:github/envoyproxy/envoyRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Envoy proxy versions starting from 1.26.0 up to but excluding 1.35.13, 1.36.9, 1.37.5, and 1.38.3 contain a null pointer dereference vulnerability in the envoy.filters.http.grpc_stats filter. When a Connect protocol request (Content-Type: application/connect+proto or application/connect+json) targets a direct_response route, the filter crashes due to a null pointer dereference, resulting in a segmentation fault and process crash. This vulnerability can be triggered by a single unauthenticated HTTP request, leading to denial of service. The issue is addressed in the specified fixed versions.
Potential Impact
An unauthenticated attacker can cause the Envoy process to crash by sending a specially crafted HTTP request, resulting in denial of service. There is no impact on confidentiality or integrity according to the CVSS vector. The availability impact is high due to process crash.
Mitigation Recommendations
Fixed versions 1.35.13, 1.36.9, 1.37.5, and 1.38.3 address this vulnerability. Users should upgrade to one of these versions to remediate the issue. Patch status is confirmed by the version fixes stated in the description. No other mitigation or temporary workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-18T22:07:37.436Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3ec10ed9e07477746fae0f
Added to database: 06/26/2026, 18:12:30 UTC
Last enriched: 06/26/2026, 18:23:25 UTC
Last updated: 06/26/2026, 18:23:41 UTC
Views: 2
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