High
Security advisory
Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service. The attacker sends a stream of frames with an empty payload and without the end-of-stream flag. These frames can be DATA, HEADERS, CONTINUATION and/or PUSH_PROMISE. The peer spends time processing each frame disproportionate to attack bandwidth. This can consume excess CPU.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-9518
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:06 UTC · Revision 1
Source evidence
Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service. The attacker sends a stream of frames with an empty payload and without the end-of-stream flag. These frames can be DATA, HEADERS, CONTINUATION and/or PUSH_PROMISE. The peer spends time processing each frame disproportionate to attack bandwidth. This can consume excess CPU.
osv:CVE-2019-9518
Complete source record
{
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"url": "https://osv.dev/vulnerability/CVE-2019-9518",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-9518",
"summary": "Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service. The attacker sends a stream of frames with an empty payload and without the end-of-stream flag. These frames can be DATA, HEADERS, CONTINUATION and/or PUSH_PROMISE. The peer spends time processing each frame disproportionate to attack bandwidth. This can consume excess CPU.",
"evidence": "osv:CVE-2019-9518",
"products": [],
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{
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],
"modified": "2026-10-24T10:30:48.749769908Z",
"provider": "osv",
"references": [
"https://lists.apache.org/thread.html/091b518265bce56a16af87b77c8cfacda902a02079e866f9fdf13b61%40%3Cusers.trafficserver.apache.org%3E",
"https://lists.apache.org/thread.html/2653c56545573b528f3f6352a29eccaf498bd6fb2a6a59568d81a61d%40%3Cannounce.trafficserver.apache.org%3E",
"https://lists.apache.org/thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe%40%3Ccommits.druid.apache.org%3E",
"https://lists.apache.org/thread.html/ff5b0821a6985159a832ff6d1a4bd311ac07ecc7db1e2d8bab619107%40%3Cdev.trafficserver.apache.org%3E",
"https://lists.apache.org/thread.html/r99a625fb17032646d96cd23dec49603ff630e9318e44a686d63046bc%40%3Ccommits.cassandra.apache.org%3E",
"https://lists.apache.org/thread.html/rd31230d01fa6aad18bdadc0720acd1747e53690bd35f73a48e7a9b75%40%3Ccommits.cassandra.apache.org%3E",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/",
"https://support.f5.com/csp/article/K46011592?utm_source=f5support&%3Butm_medium=RSS",
"https://access.redhat.com/errata/RHSA-2019:2925",
"https://access.redhat.com/errata/RHSA-2019:2939",
"https://access.redhat.com/errata/RHSA-2019:2955",
"https://access.redhat.com/errata/RHSA-2019:3892",
"https://access.redhat.com/errata/RHSA-2019:4352",
"https://access.redhat.com/errata/RHSA-2020:0727",
"https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md",
"https://kb.cert.org/vuls/id/605641/",
"https://kc.mcafee.com/corporate/index?page=content&id=SB10296",
"https://seclists.org/bugtraq/2019/Aug/24",
"https://seclists.org/bugtraq/2019/Sep/18",
"https://security.netapp.com/advisory/ntap-20190823-0005/",
"https://support.f5.com/csp/article/K46011592",
"https://www.debian.org/security/2019/dsa-4520",
"https://www.synology.com/security/advisory/Synology_SA_19_33"
],
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{
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{
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},
{
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],
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{
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},
"related_cves": [
{
"value": "CVE-2019-9518",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 436842,
"published_at": "2019-08-13T21:15:13.003+00:00"
}