NULL pointer dereference in Envoyproxy Envoy
CVE-2026-47221
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.18.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, the router filter contains a null pointer dereference vulnerability when handling HTTP 303 (See O…
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Envoyproxy Envoy — versions >= 1.38.0, < 1.38.3, >= 1.37.0, < 1.37.5, >= 1.36.0, < 1.36.9
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-47221?
- CVE-2026-47221 is a medium-severity vulnerability in Envoyproxy Envoy, classified under NULL Pointer Dereference. CVSS score: 5.9/10. Published 2026-06-26.
- How severe is CVE-2026-47221?
- Medium severity. CVSS v3 base score is 5.9 out of 10.