MediumFix available
musl — security advisory
A security flaw has been discovered in musl libc up to 1.2.6. Affected is the function iconv of the file src/locale/iconv.c of the component GB18030 4-byte Decoder. Performing a manipulation results in inefficient algorithmic complexity. The attack must be initiated from a local position. To fix this issue, it is recommended to deploy a patch.
- Products
- musl
- Affected versions
- 1.2.3-1, 1.2.4-1, 1.2.4-2, 1.2.5-1, 1.2.5-1.1, 1.2.5-2, 1.2.5-3, 1.2.5-3.1, 1.2.5-3.1~deb13u1, 1.2.6-1
- Fixed versions
- 1.2.5-3.1, 1.2.5-3.1~deb13u1
- CVEs
- CVE-2026-6042
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:39 UTC · Revision 2
Source evidence
A security flaw has been discovered in musl libc up to 1.2.6. Affected is the function iconv of the file src/locale/iconv.c of the component GB18030 4-byte Decoder. Performing a manipulation results in inefficient algorithmic complexity. The attack must be initiated from a local position. To fix this issue, it is recommended to deploy a patch.
osv:DEBIAN-CVE-2026-6042
musl
Fixed versions: Not specified
musl
Fixed versions: 1.2.5-3.1~deb13u1
musl
Fixed versions: 1.2.5-3.1
Complete source record
{
"id": "9dd5ac7f910ae76c8cbf837e1a0450978861532e06fb4034ac3827ed9dffd073",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-6042",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-6042",
"summary": "A security flaw has been discovered in musl libc up to 1.2.6. Affected is the function iconv of the file src/locale/iconv.c of the component GB18030 4-byte Decoder. Performing a manipulation results in inefficient algorithmic complexity. The attack must be initiated from a local position. To fix this issue, it is recommended to deploy a patch.",
"evidence": "osv:DEBIAN-CVE-2026-6042",
"products": [
{
"name": {
"value": "musl",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.2.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.2.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.2.4-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.2.5-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.2.5-1.1",
"evidence": "/affected/0/versions"
},
{
"value": "1.2.5-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.2.5-3",
"evidence": "/affected/0/versions"
},
{
"value": "1.2.5-3.1",
"evidence": "/affected/0/versions"
},
{
"value": "1.2.5-3.1~deb13u1",
"evidence": "/affected/0/versions"
},
{
"value": "1.2.6-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "musl",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.2.5-3.1~deb13u1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "1.2.5-3",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "musl",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.2.5-3.1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1.2.5-3",
"evidence": "/affected/2/versions"
},
{
"value": "1.2.5-3.1~deb13u1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-6042",
"aliases": [
"DEBIAN-CVE-2026-6042"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "musl",
"purl": "pkg:deb/debian/musl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.2.3-1",
"1.2.4-1",
"1.2.4-2",
"1.2.5-1",
"1.2.5-1.1",
"1.2.5-2",
"1.2.5-3",
"1.2.5-3.1",
"1.2.5-3.1~deb13u1",
"1.2.6-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6042.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.5-3.1~deb13u1"
}
]
}
],
"package": {
"name": "musl",
"purl": "pkg:deb/debian/musl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.2.5-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6042.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.5-3.1"
}
]
}
],
"package": {
"name": "musl",
"purl": "pkg:deb/debian/musl?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.2.5-3",
"1.2.5-3.1~deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6042.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-27T09:47:33.057359316Z",
"provider": "osv",
"upstream": [
"CVE-2026-6042"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-6042"
]
},
"related_cves": [
{
"value": "CVE-2026-6042",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 460955,
"published_at": "2026-04-10T09:16:25.45+00:00"
}