HighFix available
bind9, dnsjava and 5 more products — security advisory
The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.
- Products
- bind9, dnsjava, dnsmasq, knot-resolver, pdns-recursor, systemd, unbound
- Affected versions
- 1.17.1-2, 1.17.1-2+deb12u1, 1:9.18.12-1, 1:9.18.13-1, 1:9.18.16-1, 1:9.18.16-1~deb12u1, 1:9.18.16-1~deb12u1~bpo11+1, 1:9.18.19-1~deb12u1, 1:9.18.19-1~deb12u1~bpo11+1, 1:9.18.24-1~bpo11+1, 2.1.8-2, 2.89-1, 2.90-1, 2.90-2, 2.90-3, 252.11-1, 252.11-1~deb12u1, 252.12-1~deb12u1, 252.14-1~deb12u1, 252.16-1~deb12u1, 252.17-1~deb12u1, 252.18-1~deb12u1, 252.19-1~deb12u1, 252.20-1~deb12u1, 252.21-1~deb12u1, 252.22-1~deb12u1, 252.6-1, 252.6-1+loong64, 3.6.2-1, 3.6.2-2, 3.6.3-1, 4.8.4-1, 5.6.0-1
- Fixed versions
- 1.17.1-2+deb12u2, 1.19.1-1, 1:9.18.24-1, 1:9.19.21-1, 2.90-1, 2.90-4~deb12u1, 252.23-1~deb12u1, 255.4-1, 3.6.2-1, 4.8.6-1, 4.9.3-1, 5.6.0-1+deb12u1, 5.7.1-1
- CVEs
- CVE-2023-50868
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 16:08 UTC · Revision 1
Source evidence
The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.
osv:DEBIAN-CVE-2023-50868
bind9
Fixed versions: 1:9.18.24-1
bind9
Fixed versions: 1:9.19.21-1
bind9
Fixed versions: 1:9.19.21-1
dnsjava
Fixed versions: Not specified
dnsjava
Fixed versions: 3.6.2-1
dnsjava
Fixed versions: 3.6.2-1
dnsmasq
Fixed versions: 2.90-4~deb12u1
dnsmasq
Fixed versions: 2.90-1
dnsmasq
Fixed versions: 2.90-1
knot-resolver
Fixed versions: 5.6.0-1+deb12u1
knot-resolver
Fixed versions: 5.7.1-1
knot-resolver
Fixed versions: 5.7.1-1
pdns-recursor
Fixed versions: 4.8.6-1
pdns-recursor
Fixed versions: 4.9.3-1
pdns-recursor
Fixed versions: 4.9.3-1
systemd
Fixed versions: 252.23-1~deb12u1
systemd
Fixed versions: 255.4-1
systemd
Fixed versions: 255.4-1
unbound
Fixed versions: 1.17.1-2+deb12u2
unbound
Fixed versions: 1.19.1-1
unbound
Fixed versions: 1.19.1-1
Complete source record
{
"id": "c01b2daa80579de4802991d800dc11067b5e567b578498d51e0d8dbcfe0cb01a",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2023-50868",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2023-50868",
"summary": "The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the \"NSEC3\" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.",
"evidence": "osv:DEBIAN-CVE-2023-50868",
"products": [
{
"name": {
"value": "bind9",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.18.24-1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "1:9.18.12-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.13-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.16-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.16-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.16-1~deb12u1~bpo11+1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.19-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.19-1~deb12u1~bpo11+1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.19.21-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "bind9",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.19.21-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dnsjava",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.1.8-2",
"evidence": "/affected/3/versions"
},
{
"value": "3.6.2-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.6.2-2",
"evidence": "/affected/3/versions"
},
{
"value": "3.6.3-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "dnsjava",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.2-1",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dnsjava",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.2-1",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dnsmasq",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.90-4~deb12u1",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": [
{
"value": "2.89-1",
"evidence": "/affected/6/versions"
},
{
"value": "2.90-1",
"evidence": "/affected/6/versions"
},
{
"value": "2.90-2",
"evidence": "/affected/6/versions"
},
{
"value": "2.90-3",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "dnsmasq",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.90-1",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dnsmasq",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.90-1",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "knot-resolver",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "5.6.0-1+deb12u1",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": [
{
"value": "5.6.0-1",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
"value": "knot-resolver",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "5.7.1-1",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "knot-resolver",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "5.7.1-1",
"evidence": "/affected/11/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "pdns-recursor",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.8.6-1",
"evidence": "/affected/12/ranges"
}
],
"affected_versions": [
{
"value": "4.8.4-1",
"evidence": "/affected/12/versions"
}
]
},
{
"name": {
"value": "pdns-recursor",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.9.3-1",
"evidence": "/affected/13/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "pdns-recursor",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.9.3-1",
"evidence": "/affected/14/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "systemd",
"evidence": "/affected/15/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "252.23-1~deb12u1",
"evidence": "/affected/15/ranges"
}
],
"affected_versions": [
{
"value": "252.11-1",
"evidence": "/affected/15/versions"
},
{
"value": "252.11-1~deb12u1",
"evidence": "/affected/15/versions"
},
{
"value": "252.12-1~deb12u1",
"evidence": "/affected/15/versions"
},
{
"value": "252.14-1~deb12u1",
"evidence": "/affected/15/versions"
},
{
"value": "252.16-1~deb12u1",
"evidence": "/affected/15/versions"
},
{
"value": "252.17-1~deb12u1",
"evidence": "/affected/15/versions"
},
{
"value": "252.18-1~deb12u1",
"evidence": "/affected/15/versions"
},
{
"value": "252.19-1~deb12u1",
"evidence": "/affected/15/versions"
},
{
"value": "252.20-1~deb12u1",
"evidence": "/affected/15/versions"
},
{
"value": "252.21-1~deb12u1",
"evidence": "/affected/15/versions"
},
{
"value": "252.22-1~deb12u1",
"evidence": "/affected/15/versions"
},
{
"value": "252.6-1",
"evidence": "/affected/15/versions"
},
{
"value": "252.6-1+loong64",
"evidence": "/affected/15/versions"
}
]
},
{
"name": {
"value": "systemd",
"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "255.4-1",
"evidence": "/affected/16/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "systemd",
"evidence": "/affected/17/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "255.4-1",
"evidence": "/affected/17/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "unbound",
"evidence": "/affected/18/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.17.1-2+deb12u2",
"evidence": "/affected/18/ranges"
}
],
"affected_versions": [
{
"value": "1.17.1-2",
"evidence": "/affected/18/versions"
},
{
"value": "1.17.1-2+deb12u1",
"evidence": "/affected/18/versions"
}
]
},
{
"name": {
"value": "unbound",
"evidence": "/affected/19/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.19.1-1",
"evidence": "/affected/19/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "unbound",
"evidence": "/affected/20/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.19.1-1",
"evidence": "/affected/20/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2023-50868",
"aliases": [
"DEBIAN-CVE-2023-50868"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.18.24-1"
}
]
}
],
"package": {
"name": "bind9",
"purl": "pkg:deb/debian/bind9?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1:9.18.12-1",
"1:9.18.13-1",
"1:9.18.16-1",
"1:9.18.16-1~deb12u1",
"1:9.18.16-1~deb12u1~bpo11+1",
"1:9.18.19-1~deb12u1",
"1:9.18.19-1~deb12u1~bpo11+1",
"1:9.18.24-1~bpo11+1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "1:9.19.21-1"
}
]
}
],
"package": {
"name": "bind9",
"purl": "pkg:deb/debian/bind9?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
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},
{
"fixed": "1:9.19.21-1"
}
]
}
],
"package": {
"name": "bind9",
"purl": "pkg:deb/debian/bind9?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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}
]
}
],
"package": {
"name": "dnsjava",
"purl": "pkg:deb/debian/dnsjava?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.1.8-2",
"3.6.2-1",
"3.6.2-2",
"3.6.3-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.2-1"
}
]
}
],
"package": {
"name": "dnsjava",
"purl": "pkg:deb/debian/dnsjava?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.2-1"
}
]
}
],
"package": {
"name": "dnsjava",
"purl": "pkg:deb/debian/dnsjava?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.90-4~deb12u1"
}
]
}
],
"package": {
"name": "dnsmasq",
"purl": "pkg:deb/debian/dnsmasq?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.89-1",
"2.90-1",
"2.90-2",
"2.90-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.90-1"
}
]
}
],
"package": {
"name": "dnsmasq",
"purl": "pkg:deb/debian/dnsmasq?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.90-1"
}
]
}
],
"package": {
"name": "dnsmasq",
"purl": "pkg:deb/debian/dnsmasq?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "5.6.0-1+deb12u1"
}
]
}
],
"package": {
"name": "knot-resolver",
"purl": "pkg:deb/debian/knot-resolver?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"5.6.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "5.7.1-1"
}
]
}
],
"package": {
"name": "knot-resolver",
"purl": "pkg:deb/debian/knot-resolver?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "5.7.1-1"
}
]
}
],
"package": {
"name": "knot-resolver",
"purl": "pkg:deb/debian/knot-resolver?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.8.6-1"
}
]
}
],
"package": {
"name": "pdns-recursor",
"purl": "pkg:deb/debian/pdns-recursor?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"4.8.4-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.9.3-1"
}
]
}
],
"package": {
"name": "pdns-recursor",
"purl": "pkg:deb/debian/pdns-recursor?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.9.3-1"
}
]
}
],
"package": {
"name": "pdns-recursor",
"purl": "pkg:deb/debian/pdns-recursor?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
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},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
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"events": [
{
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{
"fixed": "252.23-1~deb12u1"
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],
"package": {
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},
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"252.12-1~deb12u1",
"252.14-1~deb12u1",
"252.16-1~deb12u1",
"252.17-1~deb12u1",
"252.18-1~deb12u1",
"252.19-1~deb12u1",
"252.20-1~deb12u1",
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"252.6-1",
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}
},
{
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{
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},
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},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
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},
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},
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}
},
{
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{
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}
],
"package": {
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},
"versions": [
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"1.17.1-2+deb12u1"
],
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"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "1.19.1-1"
}
]
}
],
"package": {
"name": "unbound",
"purl": "pkg:deb/debian/unbound?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "1.19.1-1"
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}
],
"package": {
"name": "unbound",
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"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-50868.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T18:02:44.247382380Z",
"provider": "osv",
"upstream": [
"CVE-2023-50868"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2023-50868"
]
},
"related_cves": [
{
"value": "CVE-2023-50868",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 456753,
"published_at": "2024-02-14T16:15:45.377+00:00"
}