Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2023-35945
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 20:00 UTC · Revision 1
Source evidence
Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec
core-osv · Original sourcePublished 13 Jul 2023, 20:41 UTC
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.
osv:CVE-2023-35945
Complete source record
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"url": "https://osv.dev/vulnerability/CVE-2023-35945",
"method": "structured",
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"kind": "advisory",
"title": "Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec",
"summary": "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.",
"evidence": "osv:CVE-2023-35945",
"products": [],
"severity": "high",
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"modified": "2026-10-28T02:30:23.200251871Z",
"provider": "osv",
"references": [
"https://cert-portal.siemens.com/productcert/html/ssa-398330.html",
"https://cert-portal.siemens.com/productcert/html/ssa-943925.html",
"https://github.com/nghttp2/nghttp2/blob/e7f59406556c80904b81b593d38508591bb7523a/lib/nghttp2_session.c#L3346",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/35xxx/CVE-2023-35945.json",
"https://github.com/envoyproxy/envoy/security/advisories/GHSA-jfxv-29pc-x22r",
"https://nvd.nist.gov/vuln/detail/CVE-2023-35945"
],
"provider_metadata": {
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"source_id": "core-osv",
"document_id": 489525,
"published_at": "2023-07-13T20:41:15.69+00:00"
}