MediumFix available
redis — security advisory
A heap overflow issue was found in Redis in versions before 5.0.10, before 6.0.9 and before 6.2.0 when using a heap allocator other than jemalloc or glibc's malloc, leading to potential out of bound write or process crash. Effectively this flaw does not affect the vast majority of users, who use jemalloc or glibc malloc.
- Products
- redis
- Affected versions
- Not specified
- Fixed versions
- 5.0.11-r0, 6.0.9-r0, 6.2.0-r0
- CVEs
- CVE-2021-3470
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 22:05 UTC · Revision 1
Source evidence
A heap overflow issue was found in Redis in versions before 5.0.10, before 6.0.9 and before 6.2.0 when using a heap allocator other than jemalloc or glibc's malloc, leading to potential out of bound write or process crash. Effectively this flaw does not affect the vast majority of users, who use jemalloc or glibc malloc.
osv:ALPINE-CVE-2021-3470
redis
Fixed versions: 5.0.11-r0
redis
Fixed versions: 6.0.9-r0
redis
Fixed versions: 6.2.0-r0
redis
Fixed versions: 6.2.0-r0
redis
Fixed versions: 6.2.0-r0
redis
Fixed versions: 6.2.0-r0
redis
Fixed versions: 6.2.0-r0
redis
Fixed versions: 6.2.0-r0
Complete source record
{
"id": "bd7e7ef8e1c44f738fa2f1feee58e27d6bd7494b95a07ff707af2aaedf26b193",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2021-3470",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2021-3470",
"summary": "A heap overflow issue was found in Redis in versions before 5.0.10, before 6.0.9 and before 6.2.0 when using a heap allocator other than jemalloc or glibc's malloc, leading to potential out of bound write or process crash. Effectively this flaw does not affect the vast majority of users, who use jemalloc or glibc malloc.",
"evidence": "osv:ALPINE-CVE-2021-3470",
"products": [
{
"name": {
"value": "redis",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "5.0.11-r0",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "redis",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.0.9-r0",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "redis",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.2.0-r0",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "redis",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.2.0-r0",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "redis",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.2.0-r0",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "redis",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.2.0-r0",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "redis",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.2.0-r0",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "redis",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.2.0-r0",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "medium",
"structured": {
"id": "ALPINE-CVE-2021-3470",
"aliases": [
"ALPINE-CVE-2021-3470"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.0.0"
},
{
"fixed": "5.0.11-r0"
}
]
}
],
"package": {
"name": "redis",
"purl": "pkg:apk/alpine/redis?arch=source",
"ecosystem": "Alpine:v3.12"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3470.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.0.0"
},
{
"fixed": "6.0.9-r0"
}
]
}
],
"package": {
"name": "redis",
"purl": "pkg:apk/alpine/redis?arch=source",
"ecosystem": "Alpine:v3.13"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3470.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.0.0"
},
{
"fixed": "6.2.0-r0"
}
]
}
],
"package": {
"name": "redis",
"purl": "pkg:apk/alpine/redis?arch=source",
"ecosystem": "Alpine:v3.14"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3470.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.0.0"
},
{
"fixed": "6.2.0-r0"
}
]
}
],
"package": {
"name": "redis",
"purl": "pkg:apk/alpine/redis?arch=source",
"ecosystem": "Alpine:v3.15"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3470.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.0.0"
},
{
"fixed": "6.2.0-r0"
}
]
}
],
"package": {
"name": "redis",
"purl": "pkg:apk/alpine/redis?arch=source",
"ecosystem": "Alpine:v3.16"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3470.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.0.0"
},
{
"fixed": "6.2.0-r0"
}
]
}
],
"package": {
"name": "redis",
"purl": "pkg:apk/alpine/redis?arch=source",
"ecosystem": "Alpine:v3.17"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3470.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.0.0"
},
{
"fixed": "6.2.0-r0"
}
]
}
],
"package": {
"name": "redis",
"purl": "pkg:apk/alpine/redis?arch=source",
"ecosystem": "Alpine:v3.18"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3470.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.0.0"
},
{
"fixed": "6.2.0-r0"
}
]
}
],
"package": {
"name": "redis",
"purl": "pkg:apk/alpine/redis?arch=source",
"ecosystem": "Alpine:v3.19"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3470.json"
},
"ecosystem_specific": {}
}
],
"modified": "2026-10-23T17:17:56.194395056Z",
"provider": "osv",
"upstream": [
"CVE-2021-3470"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2021-3470"
]
},
"related_cves": [
{
"value": "CVE-2021-3470",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 415471,
"published_at": "2021-03-31T14:15:20.937+00:00"
}