Medium
wget2 — security advisory
wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.
- Products
- wget2
- Affected versions
- 0.0.20170806-1, 1.99.1-2, 1.99.1-2.1, 1.99.1-2.2, 2.1.0-2, 2.1.0-2.1build1, 2.1.0-2.1build2, 2.2.0+ds-1, 2.2.0+ds-2, 2.2.0+ds-3, 2.2.0+ds-3build1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-1858
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:24 UTC · Revision 1
Source evidence
wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.
osv:UBUNTU-CVE-2026-1858
wget2
Fixed versions: Not specified
wget2
Fixed versions: Not specified
wget2
Fixed versions: Not specified
wget2
Fixed versions: Not specified
wget2
Fixed versions: Not specified
wget2
Fixed versions: Not specified
wget2
Fixed versions: Not specified
Complete source record
{
"id": "a546f03514e8c4f8794e7c3d26d629d7646d5bd8e6b003b65db89ab64b1f2e22",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-1858",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-1858",
"summary": "wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.",
"evidence": "osv:UBUNTU-CVE-2026-1858",
"products": [
{
"name": {
"value": "wget2",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0.20170806-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "wget2",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.99.1-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.99.1-2.1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "wget2",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "1.99.1-2.2",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
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"evidence": "/affected/3/package/name"
},
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"affected_versions": [
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"evidence": "/affected/3/versions"
},
{
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"evidence": "/affected/3/versions"
},
{
"value": "2.1.0-2.1build1",
"evidence": "/affected/3/versions"
},
{
"value": "2.1.0-2.1build2",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.2.0+ds-1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
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"evidence": "/affected/5/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "2.2.0+ds-3build1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
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"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.2.0+ds-1",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.0+ds-2",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.0+ds-3",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.0+ds-3build1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-1858",
"aliases": [
"UBUNTU-CVE-2026-1858"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "wget2",
"purl": "pkg:deb/ubuntu/wget2?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"0.0.20170806-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1858.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwget0",
"binary_version": "0.0.20170806-1"
},
{
"binary_name": "wget2",
"binary_version": "0.0.20170806-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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}
]
}
],
"package": {
"name": "wget2",
"purl": "pkg:deb/ubuntu/wget2?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"1.99.1-2",
"1.99.1-2.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1858.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwget0",
"binary_version": "1.99.1-2.1"
},
{
"binary_name": "wget2",
"binary_version": "1.99.1-2.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "wget2",
"purl": "pkg:deb/ubuntu/wget2?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1.99.1-2.2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1858.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwget0",
"binary_version": "1.99.1-2.2"
},
{
"binary_name": "wget2",
"binary_version": "1.99.1-2.2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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}
]
}
],
"package": {
"name": "wget2",
"purl": "pkg:deb/ubuntu/wget2?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"1.99.1-2.2",
"2.1.0-2",
"2.1.0-2.1build1",
"2.1.0-2.1build2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1858.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwget2t64",
"binary_version": "2.1.0-2.1build2"
},
{
"binary_name": "wget2",
"binary_version": "2.1.0-2.1build2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "wget2",
"purl": "pkg:deb/ubuntu/wget2?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"2.2.0+ds-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1858.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwget3",
"binary_version": "2.2.0+ds-1"
},
{
"binary_name": "wget2",
"binary_version": "2.2.0+ds-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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}
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"package": {
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"purl": "pkg:deb/ubuntu/wget2?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"2.2.0+ds-3build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1858.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwget3",
"binary_version": "2.2.0+ds-3build1"
},
{
"binary_name": "wget2",
"binary_version": "2.2.0+ds-3build1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "wget2",
"purl": "pkg:deb/ubuntu/wget2?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"2.2.0+ds-1",
"2.2.0+ds-2",
"2.2.0+ds-3",
"2.2.0+ds-3build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1858.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwget3",
"binary_version": "2.2.0+ds-3build1"
},
{
"binary_name": "wget2",
"binary_version": "2.2.0+ds-3build1"
}
]
}
}
],
"modified": "2026-10-17T12:56:47.221671096Z",
"provider": "osv",
"upstream": [
"CVE-2026-1858"
],
"references": [
"https://ubuntu.com/security/CVE-2026-1858",
"https://www.cve.org/CVERecord?id=CVE-2026-1858"
]
},
"related_cves": [
{
"value": "CVE-2026-1858",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 356251,
"published_at": "2026-04-29T21:16:00+00:00"
}