CVE catalog
CVE-2026-32792
NLnet Labs Unbound 1.6.2 up to and including version…
NLnet Labs Unbound 1.6.2 up to and including version 1.25.0 has a denial of service vulnerability when compiled with DNSCrypt support ('--enable-dnscrypt'). A bad DNSCrypt query could underflow Unbound's DNSCrypt packet reading procedure that may lead to heap overflow. A malicious actor can exploit the vulnerability with a single bad DNSCrypt query that its decrypted plaintext consists entirely of '0x00' bytes and does not contain the expected '0x80' marker. Unbound would then start reading more bytes than necessary until it finds a non-'0x00' byte. Based on the underlying memory allocator and the memory layout, it could lead to heap overflow while reading followed by a crash. Likelihood of a crash is low, since it relies heavily on the underlying memory allocator and the memory layout. If the heap overflow does not happen, Unbound's later packet checks will deny the packet. Unbound 1.25.1 contains a patch with a fix to bound reading in the given buffer space.
- Severity
- Medium · CVSS 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.34% · Oct 27, 2026
Projects and upstream resources
Reported versions and fixes
Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.
Version impact has not been established. The original provider fields are retained below.
Provider details and historical evidence
Original provider fields
{
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"version": "1.26.2-1"
},
{
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{
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"version": "1.22.0-2+deb13u3"
},
{
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},
{
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"version": "1.17.1-2+deb12u4"
},
{
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"status": "vulnerable",
"release": "bookworm-security",
"version": "1.17.1-2+deb12u3"
}
],
"fixed_versions": [
{
"bug": 1137187,
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"type": "source",
"origin": null,
"release": "sid",
"urgency": "unimportant",
"fixed_version": "1.25.1-1"
},
{
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"release": "forky",
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},
{
"bug": 1137187,
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"urgency": "not yet assigned",
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{
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],
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},
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{
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"1.18.0-2ubuntu2",
"1.19.1-1ubuntu1",
"1.19.2-1ubuntu1",
"1.19.2-1ubuntu3",
"1.19.2-1ubuntu3.1",
"1.19.2-1ubuntu3.2",
"1.19.2-1ubuntu3.3",
"1.19.2-1ubuntu3.4",
"1.19.2-1ubuntu3.5",
"1.19.2-1ubuntu3.6",
"1.19.2-1ubuntu3.7"
],
"ecosystem": "deb",
"fixed_version": "1.19.2-1ubuntu3.8",
"provider_record_id": "UBUNTU-CVE-2026-32792"
},
{
"name": "unbound",
"distro": "ubuntu",
"ranges": [
{
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"events": [
{
"introduced": "0"
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{
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]
}
],
"release": "25.10",
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"1.22.0-2ubuntu1",
"1.22.0-2ubuntu2",
"1.22.0-2ubuntu2.1",
"1.22.0-2ubuntu2.2"
],
"ecosystem": "deb",
"fixed_version": "1.22.0-2ubuntu2.3",
"provider_record_id": "UBUNTU-CVE-2026-32792"
},
{
"name": "unbound",
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"ranges": [
{
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{
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{
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]
}
],
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"1.24.2-1ubuntu1",
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],
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"provider_record_id": "UBUNTU-CVE-2026-32792"
},
{
"name": "unbound",
"distro": "opensuse",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"release": "leap 16.0",
"versions": [],
"ecosystem": "rpm",
"fixed_version": "1.24.1-160000.2.1",
"provider_record_id": "OPENSUSE-SU-2026:21083-1"
},
{
"name": "unbound",
"distro": "ubuntu",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
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{
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]
}
],
"release": "22.04",
"versions": [
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"1.13.1-1ubuntu3",
"1.13.1-1ubuntu5",
"1.13.1-1ubuntu5.1",
"1.13.1-1ubuntu5.2",
"1.13.1-1ubuntu5.3",
"1.13.1-1ubuntu5.4",
"1.13.1-1ubuntu5.5",
"1.13.1-1ubuntu5.7",
"1.13.1-1ubuntu5.8",
"1.13.1-1ubuntu5.10",
"1.13.1-1ubuntu5.11",
"1.13.1-1ubuntu5.12",
"1.13.1-1ubuntu5.13",
"1.13.1-1ubuntu5.14"
],
"ecosystem": "deb",
"fixed_version": "1.13.1-1ubuntu5.15",
"provider_record_id": "USN-8282-1"
},
{
"name": "unbound",
"distro": "ubuntu",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.19.2-1ubuntu3.8"
}
]
}
],
"release": "24.04",
"versions": [
"1.17.1-2",
"1.18.0-2ubuntu1",
"1.18.0-2ubuntu2",
"1.19.1-1ubuntu1",
"1.19.2-1ubuntu1",
"1.19.2-1ubuntu3",
"1.19.2-1ubuntu3.1",
"1.19.2-1ubuntu3.2",
"1.19.2-1ubuntu3.3",
"1.19.2-1ubuntu3.4",
"1.19.2-1ubuntu3.5",
"1.19.2-1ubuntu3.6",
"1.19.2-1ubuntu3.7"
],
"ecosystem": "deb",
"fixed_version": "1.19.2-1ubuntu3.8",
"provider_record_id": "USN-8282-1"
},
{
"name": "unbound",
"distro": "ubuntu",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.22.0-2ubuntu2.3"
}
]
}
],
"release": "25.10",
"versions": [
"1.22.0-1ubuntu1",
"1.22.0-2ubuntu1",
"1.22.0-2ubuntu2",
"1.22.0-2ubuntu2.1",
"1.22.0-2ubuntu2.2"
],
"ecosystem": "deb",
"fixed_version": "1.22.0-2ubuntu2.3",
"provider_record_id": "USN-8282-1"
},
{
"name": "unbound",
"distro": "ubuntu",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.24.2-1ubuntu2.1"
}
]
}
],
"release": "26.04",
"versions": [
"1.22.0-2ubuntu2",
"1.22.0-2ubuntu4",
"1.24.2-1ubuntu1",
"1.24.2-1ubuntu2"
],
"ecosystem": "deb",
"fixed_version": "1.24.2-1ubuntu2.1",
"provider_record_id": "USN-8282-1"
},
{
"name": "unbound",
"distro": "suse",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.24.1-160000.2.1"
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]
}
],
"release": "linux enterprise server 16.0",
"versions": [],
"ecosystem": "rpm",
"fixed_version": "1.24.1-160000.2.1",
"provider_record_id": "SUSE-SU-2026:22160-1"
},
{
"name": "unbound",
"distro": "suse",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.24.1-160000.2.1"
}
]
}
],
"release": "linux enterprise server for sap applications 16.0",
"versions": [],
"ecosystem": "rpm",
"fixed_version": "1.24.1-160000.2.1",
"provider_record_id": "SUSE-SU-2026:22160-1"
},
{
"name": "unbound",
"distro": "suse",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.24.1-160000.2.1"
}
]
}
],
"release": "linux micro 6.2",
"versions": [],
"ecosystem": "rpm",
"fixed_version": "1.24.1-160000.2.1",
"provider_record_id": "SUSE-SU-2026:22213-1"
},
{
"name": "unbound",
"distro": "suse",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.20.0-150100.10.25.1"
}
]
}
],
"release": "linux enterprise micro 5.5",
"versions": [],
"ecosystem": "rpm",
"fixed_version": "1.20.0-150100.10.25.1",
"provider_record_id": "SUSE-SU-2026:2369-1"
},
{
"name": "unbound",
"distro": "suse",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.20.0-150100.10.25.1"
}
]
}
],
"release": "linux enterprise high performance computing 15 sp4-espos",
"versions": [],
"ecosystem": "rpm",
"fixed_version": "1.20.0-150100.10.25.1",
"provider_record_id": "SUSE-SU-2026:2369-1"
},
{
"name": "unbound",
"distro": "suse",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.20.0-150100.10.25.1"
}
]
}
],
"release": "linux enterprise high performance computing 15 sp4-ltss",
"versions": [],
"ecosystem": "rpm",
"fixed_version": "1.20.0-150100.10.25.1",
"provider_record_id": "SUSE-SU-2026:2369-1"
},
{
"name": "unbound",
"distro": "suse",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.20.0-150100.10.25.1"
}
]
}
],
"release": "linux enterprise high performance computing 15 sp5-espos",
"versions": [],
"ecosystem": "rpm",
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"provider_record_id": "SUSE-SU-2026:2369-1"
},
{
"name": "unbound",
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{
"type": "ECOSYSTEM",
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{
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{
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}
]
}
],
"release": "linux enterprise high performance computing 15 sp5-ltss",
"versions": [],
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"provider_record_id": "SUSE-SU-2026:2369-1"
},
{
"name": "unbound",
"distro": "suse",
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{
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{
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{
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]
}
],
"release": "linux enterprise server 15 sp4-ltss",
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},
{
"name": "unbound",
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{
"type": "ECOSYSTEM",
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{
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{
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]
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],
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},
{
"name": "unbound",
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{
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{
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{
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]
}
],
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"versions": [],
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},
{
"name": "unbound",
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{
"type": "ECOSYSTEM",
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{
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{
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]
}
],
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"versions": [],
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},
{
"name": "unbound",
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"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
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]
}
],
"release": "tumbleweed",
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"provider_record_id": "OPENSUSE-SU-2026:10903-1"
}
]
}OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [libunbound8]Unknown
Source package: [unbound]
Details (4)
1.17.1-2+deb12u4· amd64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u4· arm64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· amd64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· arm64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
- [libunbound-dev]Unknown
Source package: [unbound]
Details (4)
1.17.1-2+deb12u4· amd64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u4· arm64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· amd64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· arm64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
- [python3-unbound]Unknown
Source package: [unbound]
Details (4)
1.17.1-2+deb12u4· amd64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u4· arm64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· amd64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· arm64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
- [unbound]Unknown
Details (4)
1.17.1-2+deb12u4· amd64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u4· arm64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· amd64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· arm64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
- [unbound-anchor]Unknown
Source package: [unbound]
Details (4)
1.17.1-2+deb12u4· amd64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u4· arm64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· amd64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· arm64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
- [unbound-host]Unknown
Source package: [unbound]
Details (4)
1.17.1-2+deb12u4· amd64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u4· arm64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· amd64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· arm64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
[Debian 13 (Trixie)]
- [libunbound8]Unknown
Source package: [unbound]
Details (6)
1.22.0-2+deb13u3· amd64 · trixieFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixieFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· amd64 · trixie-security · Historical versionFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixie-securityFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.26.1-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.26.2-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
- [libunbound-dev]Unknown
Source package: [unbound]
Details (6)
1.22.0-2+deb13u3· amd64 · trixieFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixieFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· amd64 · trixie-security · Historical versionFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixie-securityFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.26.1-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.26.2-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
- [python3-unbound]Unknown
Source package: [unbound]
Details (6)
1.22.0-2+deb13u3· amd64 · trixieFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixieFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· amd64 · trixie-security · Historical versionFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixie-securityFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.26.1-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.26.2-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
- [unbound]Unknown
Details (6)
1.22.0-2+deb13u3· amd64 · trixieFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixieFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· amd64 · trixie-security · Historical versionFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixie-securityFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.26.1-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.26.2-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
- [unbound-anchor]Unknown
Source package: [unbound]
Details (6)
1.22.0-2+deb13u3· amd64 · trixieFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixieFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· amd64 · trixie-security · Historical versionFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixie-securityFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.26.1-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.26.2-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
- [unbound-host]Unknown
Source package: [unbound]
Details (6)
1.22.0-2+deb13u3· amd64 · trixieFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixieFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· amd64 · trixie-security · Historical versionFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixie-securityFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.26.1-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
1.26.2-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.22.0-2+deb13u3nvd · unbound · debian · 13
[openSUSE Tumbleweed]
- [libunbound8]Unknown
Source package: [unbound]
Details (1)
1.26.0-2.1· x86_64 · tumbleweedUnknown · Fixed:
1.25.1-1.1Version impact unknown
nvd · unbound · opensuse · tumbleweed
- [python3-unbound]Unknown
Source package: [unbound]
Details (1)
1.26.0-2.1· x86_64 · tumbleweedUnknown · Fixed:
1.25.1-1.1Version impact unknown
nvd · unbound · opensuse · tumbleweed
- [unbound]Unknown
Source package: [unbound]
Details (1)
1.26.0-2.1· x86_64 · tumbleweedFixed · Fixed:
1.25.1-1.1nvd · unbound · opensuse · tumbleweed
- [unbound-anchor]Unknown
Source package: [unbound]
Details (1)
1.26.0-2.1· x86_64 · tumbleweedUnknown · Fixed:
1.25.1-1.1Version impact unknown
nvd · unbound · opensuse · tumbleweed
- [unbound-devel]Unknown
Source package: [unbound]
Details (1)
1.26.0-2.1· x86_64 · tumbleweedUnknown · Fixed:
1.25.1-1.1Version impact unknown
nvd · unbound · opensuse · tumbleweed
- [unbound-munin]Unknown
Source package: [unbound]
Details (1)
1.26.0-2.1· noarch · tumbleweedUnknown · Fixed:
1.25.1-1.1Version impact unknown
nvd · unbound · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_21874-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-32792]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-32792]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-32792]
- [https://osv.dev/vulnerability/SUSE-SU-2026:22160-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:22213-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:2369-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-32792]
- [https://osv.dev/vulnerability/USN-8282-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10903-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:21083-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-32792]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32792.json]
- [https://ubuntu.com/security/notices/USN-8282-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2455.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]