CriticalFix available
libz-mingw-w64, zlib — security advisory
zlib through 1.2.12 has a heap-based buffer over-read or buffer overflow in inflate in inflate.c via a large gzip header extra field. NOTE: only applications that call inflateGetHeader are affected. Some common applications bundle the affected zlib source code but may be unable to call inflateGetHeader (e.g., see the nodejs/node reference).
- Products
- libz-mingw-w64, zlib
- Affected versions
- Not specified
- Fixed versions
- 1.2.12+dfsg-2, 1:1.2.11.dfsg-4.1
- CVEs
- CVE-2022-37434
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 16:29 UTC · Revision 1
Source evidence
zlib through 1.2.12 has a heap-based buffer over-read or buffer overflow in inflate in inflate.c via a large gzip header extra field. NOTE: only applications that call inflateGetHeader are affected. Some common applications bundle the affected zlib source code but may be unable to call inflateGetHeader (e.g., see the nodejs/node reference).
osv:DEBIAN-CVE-2022-37434
libz-mingw-w64
Fixed versions: 1.2.12+dfsg-2
libz-mingw-w64
Fixed versions: 1.2.12+dfsg-2
libz-mingw-w64
Fixed versions: 1.2.12+dfsg-2
zlib
Fixed versions: 1:1.2.11.dfsg-4.1
zlib
Fixed versions: 1:1.2.11.dfsg-4.1
zlib
Fixed versions: 1:1.2.11.dfsg-4.1
Complete source record
{
"id": "7481590eb5f7ad301c8418cfad7d227f73b441dbe4381f70a5c41b7069c063d1",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2022-37434",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2022-37434",
"summary": "zlib through 1.2.12 has a heap-based buffer over-read or buffer overflow in inflate in inflate.c via a large gzip header extra field. NOTE: only applications that call inflateGetHeader are affected. Some common applications bundle the affected zlib source code but may be unable to call inflateGetHeader (e.g., see the nodejs/node reference).",
"evidence": "osv:DEBIAN-CVE-2022-37434",
"products": [
{
"name": {
"value": "libz-mingw-w64",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.2.12+dfsg-2",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libz-mingw-w64",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.2.12+dfsg-2",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libz-mingw-w64",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.2.12+dfsg-2",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "zlib",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:1.2.11.dfsg-4.1",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "zlib",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:1.2.11.dfsg-4.1",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "zlib",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:1.2.11.dfsg-4.1",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
}
],
"severity": "critical",
"structured": {
"id": "DEBIAN-CVE-2022-37434",
"aliases": [
"DEBIAN-CVE-2022-37434"
],
"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": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.12+dfsg-2"
}
]
}
],
"package": {
"name": "libz-mingw-w64",
"purl": "pkg:deb/debian/libz-mingw-w64?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-37434.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.12+dfsg-2"
}
]
}
],
"package": {
"name": "libz-mingw-w64",
"purl": "pkg:deb/debian/libz-mingw-w64?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-37434.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
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}
]
}
],
"package": {
"name": "libz-mingw-w64",
"purl": "pkg:deb/debian/libz-mingw-w64?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-37434.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "1:1.2.11.dfsg-4.1"
}
]
}
],
"package": {
"name": "zlib",
"purl": "pkg:deb/debian/zlib?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-37434.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:1.2.11.dfsg-4.1"
}
]
}
],
"package": {
"name": "zlib",
"purl": "pkg:deb/debian/zlib?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-37434.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:1.2.11.dfsg-4.1"
}
]
}
],
"package": {
"name": "zlib",
"purl": "pkg:deb/debian/zlib?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-37434.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-15T09:47:33.220254695Z",
"provider": "osv",
"upstream": [
"CVE-2022-37434"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2022-37434"
]
},
"related_cves": [
{
"value": "CVE-2022-37434",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 327680,
"published_at": "2022-08-05T07:15:07.24+00:00"
}