OESA-2026-3232

See a problem?
Please try reporting it to the source first.
Source
https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-3232
Import Source
https://repo.openeuler.org/security/data/osv/OESA-2026-3232.json
JSON Data
https://api.osv.dev/v1/vulns/OESA-2026-3232
Upstream
Published
2026-08-07T02:41:23Z
Modified
2026-08-07T03:00:59Z
Severity
  • 9.3 (Critical) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H CVSS Calculator
Summary
unbound security update
Details

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 NLnet Labs Unbound 1.4.22 up to and including 1.25.1, UDP source port is randomized and intended to serve as a secret value that increases the entropy of DNS transactions. When resolver load balancing policies depend on the source port while their outcome is revealed this secrecy is undermined. The vulnerability arises when the load balancing policy is consistent with respect to the incoming source UDP port and IP address while heavily depending on the incoming source UDP port as a randomization source. When the SO_REUSEPORT configuration option is enabled ('so-reuseport: yes') in Unbound (by default), it meets these conditions, making it vulnerable for DNS cache poisoning attacks. Upon startup, Unbound randomly partitions the available UDP source port space into disjoint subsets of (almost) equal size, assigning each subset to a specific worker thread. When an incoming DNS query is received, the kernel’s SO_REUSEPORT load balancing mechanism deterministically assigns the query to a socket associated with a particular thread. All outgoing DNS queries generated during the resolution of that request use source ports selected exclusively from the port subset assigned to the corresponding thread. Since these port subsets are disjoint across threads, the source port observed in a resolver’s outgoing query to an authoritative name server serves as a reliable indicator of the worker thread that processed the original client query. A malicious actor can acquire the mapping between incoming UDP source ports (for a given fixed source IP address) and Unbound worker threads and leverage it to conduct DNS cache poisoning attacks by effectively lowering the random port population per thread.(CVE-2026-50252)

Database specific 
{
    "severity": "Critical"
}
References

Affected packages

openEuler:20.03-LTS-SP4
unbound

Package

Name
unbound
Purl
pkg:rpm/openEuler/unbound&distro=openEuler-20.03-LTS-SP4

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.11.0-24.oe2003sp4

Ecosystem specific 

{
    "aarch64": [
        "python3-unbound-1.11.0-24.oe2003sp4.aarch64.rpm",
        "unbound-1.11.0-24.oe2003sp4.aarch64.rpm",
        "unbound-debuginfo-1.11.0-24.oe2003sp4.aarch64.rpm",
        "unbound-debugsource-1.11.0-24.oe2003sp4.aarch64.rpm",
        "unbound-devel-1.11.0-24.oe2003sp4.aarch64.rpm",
        "unbound-help-1.11.0-24.oe2003sp4.aarch64.rpm",
        "unbound-libs-1.11.0-24.oe2003sp4.aarch64.rpm"
    ],
    "src": [
        "unbound-1.11.0-24.oe2003sp4.src.rpm"
    ],
    "x86_64": [
        "python3-unbound-1.11.0-24.oe2003sp4.x86_64.rpm",
        "unbound-1.11.0-24.oe2003sp4.x86_64.rpm",
        "unbound-debuginfo-1.11.0-24.oe2003sp4.x86_64.rpm",
        "unbound-debugsource-1.11.0-24.oe2003sp4.x86_64.rpm",
        "unbound-devel-1.11.0-24.oe2003sp4.x86_64.rpm",
        "unbound-help-1.11.0-24.oe2003sp4.x86_64.rpm",
        "unbound-libs-1.11.0-24.oe2003sp4.x86_64.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-3232.json"
openEuler:22.03-LTS-SP4
unbound

Package

Name
unbound
Purl
pkg:rpm/openEuler/unbound&distro=openEuler-22.03-LTS-SP4

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.13.2-24.oe2203sp4

Ecosystem specific 

{
    "aarch64": [
        "python3-unbound-1.13.2-24.oe2203sp4.aarch64.rpm",
        "unbound-1.13.2-24.oe2203sp4.aarch64.rpm",
        "unbound-anchor-1.13.2-24.oe2203sp4.aarch64.rpm",
        "unbound-debuginfo-1.13.2-24.oe2203sp4.aarch64.rpm",
        "unbound-debugsource-1.13.2-24.oe2203sp4.aarch64.rpm",
        "unbound-devel-1.13.2-24.oe2203sp4.aarch64.rpm",
        "unbound-help-1.13.2-24.oe2203sp4.aarch64.rpm",
        "unbound-libs-1.13.2-24.oe2203sp4.aarch64.rpm"
    ],
    "src": [
        "unbound-1.13.2-24.oe2203sp4.src.rpm"
    ],
    "x86_64": [
        "python3-unbound-1.13.2-24.oe2203sp4.x86_64.rpm",
        "unbound-1.13.2-24.oe2203sp4.x86_64.rpm",
        "unbound-anchor-1.13.2-24.oe2203sp4.x86_64.rpm",
        "unbound-debuginfo-1.13.2-24.oe2203sp4.x86_64.rpm",
        "unbound-debugsource-1.13.2-24.oe2203sp4.x86_64.rpm",
        "unbound-devel-1.13.2-24.oe2203sp4.x86_64.rpm",
        "unbound-help-1.13.2-24.oe2203sp4.x86_64.rpm",
        "unbound-libs-1.13.2-24.oe2203sp4.x86_64.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-3232.json"
openEuler:24.03-LTS-SP1
unbound

Package

Name
unbound
Purl
pkg:rpm/openEuler/unbound&distro=openEuler-24.03-LTS-SP1

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.17.1-19.oe2403sp1

Ecosystem specific 

{
    "aarch64": [
        "python3-unbound-1.17.1-19.oe2403sp1.aarch64.rpm",
        "unbound-1.17.1-19.oe2403sp1.aarch64.rpm",
        "unbound-anchor-1.17.1-19.oe2403sp1.aarch64.rpm",
        "unbound-debuginfo-1.17.1-19.oe2403sp1.aarch64.rpm",
        "unbound-debugsource-1.17.1-19.oe2403sp1.aarch64.rpm",
        "unbound-devel-1.17.1-19.oe2403sp1.aarch64.rpm",
        "unbound-help-1.17.1-19.oe2403sp1.aarch64.rpm",
        "unbound-libs-1.17.1-19.oe2403sp1.aarch64.rpm",
        "unbound-utils-1.17.1-19.oe2403sp1.aarch64.rpm"
    ],
    "src": [
        "unbound-1.17.1-19.oe2403sp1.src.rpm"
    ],
    "x86_64": [
        "python3-unbound-1.17.1-19.oe2403sp1.x86_64.rpm",
        "unbound-1.17.1-19.oe2403sp1.x86_64.rpm",
        "unbound-anchor-1.17.1-19.oe2403sp1.x86_64.rpm",
        "unbound-debuginfo-1.17.1-19.oe2403sp1.x86_64.rpm",
        "unbound-debugsource-1.17.1-19.oe2403sp1.x86_64.rpm",
        "unbound-devel-1.17.1-19.oe2403sp1.x86_64.rpm",
        "unbound-help-1.17.1-19.oe2403sp1.x86_64.rpm",
        "unbound-libs-1.17.1-19.oe2403sp1.x86_64.rpm",
        "unbound-utils-1.17.1-19.oe2403sp1.x86_64.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-3232.json"
openEuler:24.03-LTS-SP3
unbound

Package

Name
unbound
Purl
pkg:rpm/openEuler/unbound&distro=openEuler-24.03-LTS-SP3

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.17.1-18.oe2403sp3

Ecosystem specific 

{
    "aarch64": [
        "python3-unbound-1.17.1-18.oe2403sp3.aarch64.rpm",
        "unbound-1.17.1-18.oe2403sp3.aarch64.rpm",
        "unbound-anchor-1.17.1-18.oe2403sp3.aarch64.rpm",
        "unbound-debuginfo-1.17.1-18.oe2403sp3.aarch64.rpm",
        "unbound-debugsource-1.17.1-18.oe2403sp3.aarch64.rpm",
        "unbound-devel-1.17.1-18.oe2403sp3.aarch64.rpm",
        "unbound-help-1.17.1-18.oe2403sp3.aarch64.rpm",
        "unbound-libs-1.17.1-18.oe2403sp3.aarch64.rpm",
        "unbound-utils-1.17.1-18.oe2403sp3.aarch64.rpm"
    ],
    "src": [
        "unbound-1.17.1-18.oe2403sp3.src.rpm"
    ],
    "x86_64": [
        "python3-unbound-1.17.1-18.oe2403sp3.x86_64.rpm",
        "unbound-1.17.1-18.oe2403sp3.x86_64.rpm",
        "unbound-anchor-1.17.1-18.oe2403sp3.x86_64.rpm",
        "unbound-debuginfo-1.17.1-18.oe2403sp3.x86_64.rpm",
        "unbound-debugsource-1.17.1-18.oe2403sp3.x86_64.rpm",
        "unbound-devel-1.17.1-18.oe2403sp3.x86_64.rpm",
        "unbound-help-1.17.1-18.oe2403sp3.x86_64.rpm",
        "unbound-libs-1.17.1-18.oe2403sp3.x86_64.rpm",
        "unbound-utils-1.17.1-18.oe2403sp3.x86_64.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-3232.json"
openEuler:24.03-LTS-SP4
unbound

Package

Name
unbound
Purl
pkg:rpm/openEuler/unbound&distro=openEuler-24.03-LTS-SP4

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.17.1-18.oe2403sp4

Ecosystem specific 

{
    "aarch64": [
        "python3-unbound-1.17.1-18.oe2403sp4.aarch64.rpm",
        "unbound-1.17.1-18.oe2403sp4.aarch64.rpm",
        "unbound-anchor-1.17.1-18.oe2403sp4.aarch64.rpm",
        "unbound-debuginfo-1.17.1-18.oe2403sp4.aarch64.rpm",
        "unbound-debugsource-1.17.1-18.oe2403sp4.aarch64.rpm",
        "unbound-devel-1.17.1-18.oe2403sp4.aarch64.rpm",
        "unbound-help-1.17.1-18.oe2403sp4.aarch64.rpm",
        "unbound-libs-1.17.1-18.oe2403sp4.aarch64.rpm",
        "unbound-utils-1.17.1-18.oe2403sp4.aarch64.rpm"
    ],
    "src": [
        "unbound-1.17.1-18.oe2403sp4.src.rpm"
    ],
    "x86_64": [
        "python3-unbound-1.17.1-18.oe2403sp4.x86_64.rpm",
        "unbound-1.17.1-18.oe2403sp4.x86_64.rpm",
        "unbound-anchor-1.17.1-18.oe2403sp4.x86_64.rpm",
        "unbound-debuginfo-1.17.1-18.oe2403sp4.x86_64.rpm",
        "unbound-debugsource-1.17.1-18.oe2403sp4.x86_64.rpm",
        "unbound-devel-1.17.1-18.oe2403sp4.x86_64.rpm",
        "unbound-help-1.17.1-18.oe2403sp4.x86_64.rpm",
        "unbound-libs-1.17.1-18.oe2403sp4.x86_64.rpm",
        "unbound-utils-1.17.1-18.oe2403sp4.x86_64.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-3232.json"