unbound security update
Unbound is a validating, recursive, caching DNS resolver. It is designed to be fast and lean and incorporates modern features based on open standards. To help increase online privacy, Unbound supports DNS-over-TLS which allows clients to encrypt their communication. Unbound is available for most platforms such as FreeBSD, OpenBSD, NetBSD, MacOS, Linux and Microsoft Windows. Unbound is a totally free, open source software under the BSD license. It doesn't make custom builds or provide specific features to paying customers only. Security Fix(es): In NLnetLabs Unbound up to and including 1.26.0, a degradation of service vulnerability is present in the TCP/DoT reading procedure where there is no limit on consecutive reads. A malicious actor that can stream and sustain a rate of distinct uncached names over the TCP/DoT connection, monopolizes a single worker's entire event loop for as long as its writes stay ahead of the drain.(CVE-2026-80225) In NLnet Labs Unbound up to and including 1.26.0, a 255 length query name with a large TCP response can lead to a heap buffer overflow during the RRSet canonicalisation routine. This is caused by missing to add the first owner name into the buffer length check. A malicious actor operating a malicious name server or tampering with an incoming response to Unbound (canonicalisation happens before DNSSEC validation), can trigger the vulnerability.(CVE-2026-81634) In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in
OESA-2026-4149
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:OESA-2026-4149
unbound
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.17.1-22.oe2403sp3
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.17.1-22.oe2403sp3"
}
]
}
],
"package": {
"name": "unbound",
"purl": "pkg:rpm/openEuler/unbound&distro=openEuler-24.03-LTS-SP3",
"ecosystem": "openEuler:24.03-LTS-SP3"
},
"database_specific": {
"source": "https://repo.openeuler.org/security/data/osv/OESA-2026-4149.json"
},
"ecosystem_specific": {
"src": [
"unbound-1.17.1-22.oe2403sp3.src.rpm"
],
"x86_64": [
"python3-unbound-1.17.1-22.oe2403sp3.x86_64.rpm",
"unbound-1.17.1-22.oe2403sp3.x86_64.rpm",
"unbound-anchor-1.17.1-22.oe2403sp3.x86_64.rpm",
"unbound-debuginfo-1.17.1-22.oe2403sp3.x86_64.rpm",
"unbound-debugsource-1.17.1-22.oe2403sp3.x86_64.rpm",
"unbound-devel-1.17.1-22.oe2403sp3.x86_64.rpm",
"unbound-help-1.17.1-22.oe2403sp3.x86_64.rpm",
"unbound-libs-1.17.1-22.oe2403sp3.x86_64.rpm",
"unbound-utils-1.17.1-22.oe2403sp3.x86_64.rpm"
],
"aarch64": [
"python3-unbound-1.17.1-22.oe2403sp3.aarch64.rpm",
"unbound-1.17.1-22.oe2403sp3.aarch64.rpm",
"unbound-anchor-1.17.1-22.oe2403sp3.aarch64.rpm",
"unbound-debuginfo-1.17.1-22.oe2403sp3.aarch64.rpm",
"unbound-debugsource-1.17.1-22.oe2403sp3.aarch64.rpm",
"unbound-devel-1.17.1-22.oe2403sp3.aarch64.rpm",
"unbound-help-1.17.1-22.oe2403sp3.aarch64.rpm",
"unbound-libs-1.17.1-22.oe2403sp3.aarch64.rpm",
"unbound-utils-1.17.1-22.oe2403sp3.aarch64.rpm"
]
}
}
]Publisher severity
critical
Source reference: /database_specific/severity
- Event
- #52072 · Revision 1
- Added to Heist Feed
- Publisher date