UBUNTU-CVE-2026-123570

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Source
https://ubuntu.com/security/CVE-2026-123570
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123570.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-123570
Upstream
Published
2026-11-09T00:00:00Z
Modified
2026-11-10T02:50:21Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

The DNS wire-format message parser in hickory-proto (Hickory DNS) 0.18 before 0.26.2 preallocates record vectors sized by the untrusted ANCOUNT, NSCOUNT, and ARCOUNT header fields before reading record data. Remote attackers can send a UDP datagram, or a spoofed response to a client/resolver, with these counts set to 65535, forcing about 18MB of allocation per message.

References

Affected packages

Ubuntu:24.04:LTS / rust-hickory-proto

Package

Name
rust-hickory-proto
Purl
pkg:deb/ubuntu/rust-hickory-proto?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.24.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "librust-hickory-proto-dev",
            "binary_version": "0.24.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123570.json"

Ubuntu:26.10 / rust-hickory-proto

Package

Name
rust-hickory-proto
Purl
pkg:deb/ubuntu/rust-hickory-proto?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.24.4-6
0.26.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "librust-hickory-proto-dev",
            "binary_version": "0.26.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123570.json"

Ubuntu:26.04:LTS / rust-hickory-proto

Package

Name
rust-hickory-proto
Purl
pkg:deb/ubuntu/rust-hickory-proto?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.24.4-4.1
0.24.4-6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "librust-hickory-proto-dev",
            "binary_version": "0.24.4-6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123570.json"