Medium
Security advisory
Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-9516
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:43 UTC · Revision 1
Source evidence
Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.
osv:CVE-2019-9516
Complete source record
{
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"method": "structured",
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"title": "CVE-2019-9516",
"summary": "Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.",
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"modified": "2026-10-24T10:30:21.723191297Z",
"provider": "osv",
"references": [
"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/BP556LEG3WENHZI5TAQ6ZEBFTJB4E2IS/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H472D5HPXN6RRXCNFML3BK5OYC52CXF2/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/POPAEC4FWL4UU4LDEGPY5NPALU24FFQD/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TAZZEVTCN2B4WT6AIBJ7XGYJMBTORJU5/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XHTKU7YQ5EEP2XNSAV4M4VJ7QCBOJMOD/",
"https://support.f5.com/csp/article/K02591030?utm_source=f5support&%3Butm_medium=RSS",
"https://access.redhat.com/errata/RHSA-2019:2745",
"https://access.redhat.com/errata/RHSA-2019:2746",
"https://access.redhat.com/errata/RHSA-2019:2775",
"https://access.redhat.com/errata/RHSA-2019:2799",
"https://access.redhat.com/errata/RHSA-2019:2925",
"https://access.redhat.com/errata/RHSA-2019:2939",
"https://access.redhat.com/errata/RHSA-2019:2946",
"https://access.redhat.com/errata/RHSA-2019:2950",
"https://access.redhat.com/errata/RHSA-2019:2955",
"https://access.redhat.com/errata/RHSA-2019:2966",
"https://access.redhat.com/errata/RHSA-2019:3932",
"https://access.redhat.com/errata/RHSA-2019:3933",
"https://access.redhat.com/errata/RHSA-2019:3935",
"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/Aug/40",
"https://security.netapp.com/advisory/ntap-20190823-0002/",
"https://security.netapp.com/advisory/ntap-20190823-0005/",
"https://support.f5.com/csp/article/K02591030",
"https://usn.ubuntu.com/4099-1/",
"https://www.debian.org/security/2019/dsa-4505",
"https://www.synology.com/security/advisory/Synology_SA_19_33"
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{
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{
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},
"related_cves": [
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 430542,
"published_at": "2019-08-13T21:15:12.583+00:00"
}