Critical
Security advisory
In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize operations can place the header table into a corrupted state, leading to a use-after-free condition and undefined behavior. This issue affects Proxygen from v0.29.0 until v2017.04.03.00.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-11940
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:35 UTC · Revision 1
Source evidence
In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize operations can place the header table into a corrupted state, leading to a use-after-free condition and undefined behavior. This issue affects Proxygen from v0.29.0 until v2017.04.03.00.
osv:CVE-2019-11940
Complete source record
{
"id": "68a87f5e84dc58f90e3425b36efebcfe2cb69e56a198055525a525faa626b7cc",
"url": "https://osv.dev/vulnerability/CVE-2019-11940",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-11940",
"summary": "In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize operations can place the header table into a corrupted state, leading to a use-after-free condition and undefined behavior. This issue affects Proxygen from v0.29.0 until v2017.04.03.00.",
"evidence": "osv:CVE-2019-11940",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2019-11940",
"aliases": [
"CVE-2019-11940"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/facebook/proxygen",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f"
}
],
"database_specific": {
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{
"range": [
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}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
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"v2017.03.20.00",
"v2017.03.13.00",
"v2017.03.06.00",
"v2017.01.30.00",
"v2017.01.23.00",
"v2017.01.16.00",
"v0.32.0",
"v0.30.0",
"v0.29.0",
"v0.28.0",
"v0.27.0",
"v0.26.0",
"v0.25.0",
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"v0.23.0",
"v0.22.0",
"v0.21.0",
"v0.20.0",
"v0.19.0",
"v0.18.0"
],
"database_specific": {
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"vanir_signatures": [
{
"id": "CVE-2019-11940-2ddc95bb",
"digest": {
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"function_hash": "21166485523548710051446224941708954679"
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"source": "https://github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f",
"target": {
"file": "proxygen/lib/http/codec/compress/test/HeaderTableTests.cpp",
"function": "TEST_F"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2019-11940-40fc9835",
"digest": {
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"function_hash": "25486112264607848014138733967360462091"
},
"source": "https://github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f",
"target": {
"file": "proxygen/lib/http/codec/compress/HeaderTable.cpp",
"function": "HeaderTable::setCapacity"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2019-11940-9f132c56",
"digest": {
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"source": "https://github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f",
"target": {
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},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2019-11940-f944feae",
"digest": {
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},
"source": "https://github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f",
"target": {
"file": "proxygen/lib/http/codec/compress/test/HeaderTableTests.cpp"
},
"deprecated": false,
"signature_type": "Line",
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}
],
"vanir_signatures_modified": "2026-10-31T07:05:19Z"
}
},
{
"ranges": [
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"type": "GIT",
"events": [
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},
{
"last_affected": "ce3fed75c6336befb65a3ccda22ab2157ec03d21"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:facebook:proxygen:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0.29.0"
},
{
"last_affected": "2017.04.03.00"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
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"v2017.03.27.00",
"v2017.03.20.00",
"v2017.03.13.00",
"v2017.03.06.00",
"v2017.01.30.00",
"v2017.01.23.00",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-11940.json"
}
}
],
"modified": "2026-10-31T07:05:19.534346136Z",
"provider": "osv",
"references": [
"https://www.facebook.com/security/advisories/cve-2019-11940",
"https://github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2019-11940",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388416,
"published_at": "2019-12-04T17:16:43.773+00:00"
}