CVE-2023-35945
Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec
Description
Envoy is a cloud-native high-performance edge/middle/service proxy. Envoy’s HTTP/2 codec may leak a header map and bookkeeping structures upon receiving `RST_STREAM` immediately followed by the `GOAWAY` frames from an upstream server. In nghttp2, cleanup of pending requests due to receipt of the `GOAWAY` frame skips de-allocation of the bookkeeping structure and pending compressed header. The error return [code path] is taken if connection is already marked for not sending more requests due to `GOAWAY` frame. The clean-up code is right after the return statement, causing memory leak. Denial of service through memory exhaustion. This vulnerability was patched in versions(s) 1.26.3, 1.25.8, 1.24.9, 1.23.11.
How to fix CVE-2023-35945
To remediate CVE-2023-35945, upgrade the affected package to a fixed version below.
- —upgrade to 1.46.0-r1 or later
- —upgrade to 1.23.11 or later
Is CVE-2023-35945 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1.46.0-r1
- from 0, < 1.23.11, >= 1.24.0, < 1.24.9, >= 1.25.0, < 1.25.8, >= 1.26.0, < 1.26.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |