HighFix available
grub — security advisory
A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
- Products
- grub
- Affected versions
- Not specified
- Fixed versions
- 2.06-r12, 2.06-r13, 2.06-r3, 2.06-r8
- CVEs
- CVE-2021-3697
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 22:05 UTC · Revision 1
Source evidence
A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
osv:ALPINE-CVE-2021-3697
grub
Fixed versions: 2.06-r3
grub
Fixed versions: 2.06-r3
grub
Fixed versions: 2.06-r8
grub
Fixed versions: 2.06-r12
grub
Fixed versions: 2.06-r13
grub
Fixed versions: 2.06-r13
grub
Fixed versions: 2.06-r13
grub
Fixed versions: 2.06-r13
grub
Fixed versions: 2.06-r13
grub
Fixed versions: 2.06-r13
Complete source record
{
"id": "6803e577d715ceef703e1f6e843b1d19f3b2201b609e2d9721ea9e9a2dd42b22",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2021-3697",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2021-3697",
"summary": "A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.",
"evidence": "osv:ALPINE-CVE-2021-3697",
"products": [
{
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"evidence": "/affected/0/package/name"
},
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],
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},
{
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},
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/8/package/name"
},
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"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
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},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.06-r13",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "ALPINE-CVE-2021-3697",
"aliases": [
"ALPINE-CVE-2021-3697"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.06-r3"
}
]
}
],
"package": {
"name": "grub",
"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.15"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3697.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
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],
"package": {
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"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.16"
},
"database_specific": {
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{
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],
"package": {
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"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.17"
},
"database_specific": {
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],
"package": {
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"ecosystem": "Alpine:v3.18"
},
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],
"package": {
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"ecosystem": "Alpine:v3.19"
},
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"package": {
"name": "grub",
"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.20"
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"database_specific": {
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],
"package": {
"name": "grub",
"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.21"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3697.json"
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"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.22"
},
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],
"package": {
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"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
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"package": {
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"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.24"
},
"database_specific": {
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}
],
"modified": "2026-10-23T17:17:56.202521782Z",
"provider": "osv",
"upstream": [
"CVE-2021-3697"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2021-3697"
]
},
"related_cves": [
{
"value": "CVE-2021-3697",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 415506,
"published_at": "2022-07-06T16:15:08.32+00:00"
}