High
Security advisory
folly::secureRandom will re-use a buffer between parent and child processes when fork() is called. That will result in multiple forked children producing repeat (or similar) results. This affects HHVM 3.26 prior to 3.26.3 and the folly library between v2017.12.11.00 and v2018.08.09.00.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-6337
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:27 UTC · Revision 1
Source evidence
folly::secureRandom will re-use a buffer between parent and child processes when fork() is called. That will result in multiple forked children producing repeat (or similar) results. This affects HHVM 3.26 prior to 3.26.3 and the folly library between v2017.12.11.00 and v2018.08.09.00.
osv:CVE-2018-6337
Complete source record
{
"id": "e5bab6a5f6e3280f8a67449ccdd317308c99608fcb91d2a03109bee0f37c6adc",
"url": "https://osv.dev/vulnerability/CVE-2018-6337",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-6337",
"summary": "folly::secureRandom will re-use a buffer between parent and child processes when fork() is called. That will result in multiple forked children producing repeat (or similar) results. This affects HHVM 3.26 prior to 3.26.3 and the folly library between v2017.12.11.00 and v2018.08.09.00.",
"evidence": "osv:CVE-2018-6337",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2018-6337",
"aliases": [
"CVE-2018-6337"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
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"repo": "https://github.com/facebook/folly",
"type": "GIT",
"events": [
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},
{
"fixed": "8e927ee48b114c8a2f90d0cbd5ac753795a6761f"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:facebook:folly:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2017.12.11.00"
},
{
"last_affected": "2018.08.09.00"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "8e927ee48b114c8a2f90d0cbd5ac753795a6761f"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
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"v2018.07.30.00",
"v2018.07.23.00",
"v2018.07.16.00",
"v2018.07.09.00",
"v2018.07.02.00",
"v2018.06.25.00",
"v2018.06.18.00",
"v2018.06.11.00",
"v2018.06.04.00",
"v2018.05.28.00",
"v2018.05.21.00",
"v2018.05.14.00",
"v2018.05.07.00",
"v2018.04.30.00",
"v2018.04.23.00",
"v2018.04.16.00",
"v2018.04.09.00",
"v2018.04.02.00",
"v2018.03.26.00",
"v2018.03.19.00",
"v2018.03.12.00",
"v2018.03.05.00",
"v2018.02.26.00",
"v2018.02.19.00",
"v2018.02.12.00",
"v2018.02.05.00",
"v2018.01.29.00",
"v2018.01.22.00",
"v2018.01.15.00",
"v2018.01.08.00",
"v2018.01.01.00",
"v2017.12.25.00",
"v2017.12.18.00",
"v2017.12.11.00"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-6337.json",
"vanir_signatures": [
{
"id": "CVE-2018-6337-26c63d9e",
"digest": {
"length": 167,
"function_hash": "284036517926769522446303472293932871264"
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"source": "https://github.com/facebook/folly/commit/8e927ee48b114c8a2f90d0cbd5ac753795a6761f",
"target": {
"file": "folly/Random.cpp",
"function": "BufferedRandomDevice::BufferedRandomDevice"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
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{
"id": "CVE-2018-6337-8d3baadc",
"digest": {
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"source": "https://github.com/facebook/folly/commit/8e927ee48b114c8a2f90d0cbd5ac753795a6761f",
"target": {
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"vanir_signatures_modified": "2026-10-20T13:37:24Z"
}
},
{
"ranges": [
{
"repo": "https://github.com/facebook/hhvm",
"type": "GIT",
"events": [
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"fixed": "cea63133cb066ebff74f9fc42789fa2017beab55"
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{
"fixed": "e2d10a1e32d01f71aaadd81169bcb9ae86c5d6b8"
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"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.26"
},
{
"fixed": "3.26.3"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "e2d10a1e32d01f71aaadd81169bcb9ae86c5d6b8"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"HHVM-3.26.2",
"HHVM-3.26.1",
"HHVM-3.26.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-6337.json",
"vanir_signatures": [
{
"id": "CVE-2018-6337-9642f365",
"digest": {
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"source": "https://github.com/facebook/hhvm/commit/cea63133cb066ebff74f9fc42789fa2017beab55",
"target": {
"file": "hphp/runtime/version.h"
},
"deprecated": false,
"signature_type": "Line",
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],
"vanir_signatures_modified": "2026-10-20T13:37:24Z"
}
}
],
"modified": "2026-10-20T13:37:24.179031397Z",
"provider": "osv",
"references": [
"https://hhvm.com/blog/2018/05/24/hhvm-3.26.3.html",
"https://github.com/facebook/folly/commit/8e927ee48b114c8a2f90d0cbd5ac753795a6761f",
"https://github.com/facebook/hhvm/commit/e2d10a1e32d01f71aaadd81169bcb9ae86c5d6b8"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2018-6337",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 387896,
"published_at": "2018-12-31T22:29:00.247+00:00"
}