HighFix available
nghttp2, nodejs — security advisory
In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., > 32), then drop the connection.
- Products
- nghttp2, nodejs
- Affected versions
- Not specified
- Fixed versions
- 1.35.1-r2, 1.39.2-r1, 1.40.0-r1, 1.41.0-r0, 12.18.0-r0, 12.18.3-r0, 12.20.1-r0
- CVEs
- CVE-2020-11080
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:00 UTC · Revision 1
Source evidence
In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., > 32), then drop the connection.
osv:ALPINE-CVE-2020-11080
nghttp2
Fixed versions: 1.39.2-r1
nghttp2
Fixed versions: 1.40.0-r1
nghttp2
Fixed versions: 1.41.0-r0
nghttp2
Fixed versions: 1.41.0-r0
nghttp2
Fixed versions: 1.41.0-r0
nghttp2
Fixed versions: 1.41.0-r0
nghttp2
Fixed versions: 1.41.0-r0
nghttp2
Fixed versions: 1.41.0-r0
nghttp2
Fixed versions: 1.41.0-r0
nghttp2
Fixed versions: 1.41.0-r0
nghttp2
Fixed versions: 1.41.0-r0
nghttp2
Fixed versions: 1.41.0-r0
nghttp2
Fixed versions: 1.41.0-r0
nghttp2
Fixed versions: 1.41.0-r0
nghttp2
Fixed versions: 1.41.0-r0
nghttp2
Fixed versions: 1.35.1-r2
nodejs
Fixed versions: 12.20.1-r0
nodejs
Fixed versions: 12.18.3-r0
nodejs
Fixed versions: 12.18.0-r0
nodejs
Fixed versions: 12.18.0-r0
nodejs
Fixed versions: 12.18.0-r0
nodejs
Fixed versions: 12.18.0-r0
nodejs
Fixed versions: 12.18.0-r0
nodejs
Fixed versions: 12.18.0-r0
nodejs
Fixed versions: 12.18.0-r0
nodejs
Fixed versions: 12.18.0-r0
nodejs
Fixed versions: 12.18.0-r0
nodejs
Fixed versions: 12.18.0-r0
nodejs
Fixed versions: 12.18.0-r0
nodejs
Fixed versions: 12.18.0-r0
Complete source record
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"modified": "2026-10-26T11:17:55.099720880Z",
"provider": "osv",
"upstream": [
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],
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]
},
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{
"value": "CVE-2020-11080",
"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450348,
"published_at": "2020-06-03T23:15:11.073+00:00"
}