UBUNTU-CVE-2026-123571

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Source

https://ubuntu.com/security/CVE-2026-123571

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123571.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-123571

Upstream

CVE-2026-123571

Published

2026-11-09T00:00:00Z

Modified

2026-11-10T02:49:53Z

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

Hickory DNS from 0.26.0 before 0.26.2 contains an integer underflow vulnerability in TSIG RDATA decoding that allows remote attackers to trigger a panic via malformed records. Attackers can send a crafted TSIG record in DNS wire format to cause unchecked subtraction underflow, crashing builds with overflow checks enabled and causing denial of service.

References

Affected packages

Ubuntu:26.10 / rust-hickory-dns

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.24.4-1

0.25.2-3

0.26.1-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "hickory-dns",
            "binary_version": "0.26.1-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123571.json"

Ubuntu:26.04:LTS / rust-hickory-dns