Upstream information

CVE-2026-64194 at MITRE

Description

Net::DNS versions through 1.55 for Perl allow Denial of Service via deep DNS compression pointer chains.

Net::DNS::DomainName::decode follows RFC 1035 compression pointers by recursing into itself with no depth limit. It is possible to construct a name which saturates the call stack (at least with larger TCP responses), leading to a potential Denial of Service.

The guard `$link < $offset` prevents forward and circular chains, but still allows arbitrarily long backward chains. The per-offset cache (`$cache`) is populated at the start of each call and short-circuits only re-traverses of the same offset - the initial descent through a fresh chain still recurses at full depth.

A crafted packet can chain two-byte compression pointers so that each one points two bytes earlier than the previous, producing a chain length of `offset / 2`. For the 14-bit pointer field (max offset 16383) this gives up to ~8191 recursive frames. For a TCP DNS message the limit is the 16-bit length field (~32767 frames). Perl's default C stack handles only a few thousand frames; beyond that the process receives SIGSEGV or similar, which is a denial-of-service for any application parsing untrusted DNS data.

The vulnerability is triggered by `Net::DNS::Packet->new(\$wire)` i.e. any point where the library decodes a DNS message from the network.

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having important severity.

CVSS v3 Scores
CVSS detail CNA (CISA-ADP) SUSE
Base Score 7.5 7.5
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network Network
Attack Complexity Low Low
Privileges Required None None
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact None None
Integrity Impact None None
Availability Impact High High
CVSSv3 Version 3.1 3.1
SUSE Bugzilla entry: 1272214 [NEW]

No SUSE Security Announcements cross referenced.


Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise Desktop 15 SP7 perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 perl-Net-DNS Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP7 perl-Net-DNS Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 perl-Net-DNS Affected
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Performance Computing 15 SP4 perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5 perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Module for Basesystem 15 SP4 perl-Net-DNS Affected
SUSE Linux Enterprise Module for Basesystem 15 SP5 perl-Net-DNS Affected
SUSE Linux Enterprise Module for Basesystem 15 SP6 perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP5 perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP5-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP4 perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP4-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP5 perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP5-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP6 perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP6-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 perl-Net-DNS Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP6 perl-Net-DNS Affected
SUSE Manager Proxy 4.3 perl-Net-DNS Affected
SUSE Manager Proxy LTS 4.3 perl-Net-DNS Affected
SUSE Manager Retail Branch Server 4.3 perl-Net-DNS Affected
SUSE Manager Retail Branch Server LTS 4.3 perl-Net-DNS Affected
SUSE Manager Server 4.3 perl-Net-DNS Affected
SUSE Manager Server LTS 4.3 perl-Net-DNS Affected
Products past their end of life and not receiving proactive updates anymore.
HPE Helion OpenStack 8 perl-Net-DNS Affected
SUSE CaaS Platform 4.0 perl-Net-DNS Affected
SUSE Enterprise Storage 6 perl-Net-DNS Affected
SUSE Enterprise Storage 7 perl-Net-DNS Affected
SUSE Enterprise Storage 7.1 perl-Net-DNS Affected
SUSE Linux Enterprise Desktop 12 perl-Net-DNS Affected
SUSE Linux Enterprise Desktop 12 SP1 perl-Net-DNS Affected
SUSE Linux Enterprise Desktop 12 SP2 perl-Net-DNS Affected
SUSE Linux Enterprise Desktop 12 SP3 perl-Net-DNS Affected
SUSE Linux Enterprise Desktop 12 SP4 perl-Net-DNS Affected
SUSE Linux Enterprise Desktop 15 perl-Net-DNS Affected
SUSE Linux Enterprise Desktop 15 SP1 perl-Net-DNS Affected
SUSE Linux Enterprise Desktop 15 SP2 perl-Net-DNS Affected
SUSE Linux Enterprise Desktop 15 SP3 perl-Net-DNS Affected
SUSE Linux Enterprise Desktop 15 SP4 perl-Net-DNS Affected
SUSE Linux Enterprise Desktop 15 SP5 perl-Net-DNS Affected
SUSE Linux Enterprise Desktop 15 SP6 perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP1 perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP2 perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP3 perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15 SP6 perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15-ESPOS perl-Net-DNS Affected
SUSE Linux Enterprise High Performance Computing 15-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Module for Basesystem 15 perl-Net-DNS Affected
SUSE Linux Enterprise Module for Basesystem 15 SP1 perl-Net-DNS Affected
SUSE Linux Enterprise Module for Basesystem 15 SP2 perl-Net-DNS Affected
SUSE Linux Enterprise Module for Basesystem 15 SP3 perl-Net-DNS Affected
SUSE Linux Enterprise Point of Sale 12 SP2-CLIENT perl-Net-DNS Affected
SUSE Linux Enterprise Real Time 15 SP2 perl-Net-DNS Affected
SUSE Linux Enterprise Real Time 15 SP3 perl-Net-DNS Affected
SUSE Linux Enterprise Real Time 15 SP4 perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP1 perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP1-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP2 perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP2-BCL perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP2-ESPOS perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP2-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP3 perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP3-BCL perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP3-ESPOS perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP3-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP4 perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP4-ESPOS perl-Net-DNS Affected
SUSE Linux Enterprise Server 12 SP4-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Server 12-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP1 perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP1-BCL perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP1-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP2 perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP2-BCL perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP2-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP3 perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP3-BCL perl-Net-DNS Affected
SUSE Linux Enterprise Server 15 SP3-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Server 15-LTSS perl-Net-DNS Affected
SUSE Linux Enterprise Server for Raspberry Pi 12 SP2 perl-Net-DNS Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP1 perl-Net-DNS Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP2 perl-Net-DNS Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP3 perl-Net-DNS Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP4 perl-Net-DNS Affected
SUSE Linux Enterprise Server for SAP Applications 15 perl-Net-DNS Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP1 perl-Net-DNS Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP2 perl-Net-DNS Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 perl-Net-DNS Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 perl-Net-DNS Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP5 perl-Net-DNS Affected
SUSE Manager Proxy 4.0 perl-Net-DNS Affected
SUSE Manager Proxy 4.1 perl-Net-DNS Affected
SUSE Manager Proxy 4.2 perl-Net-DNS Affected
SUSE Manager Retail Branch Server 4.0 perl-Net-DNS Affected
SUSE Manager Retail Branch Server 4.1 perl-Net-DNS Affected
SUSE Manager Retail Branch Server 4.2 perl-Net-DNS Affected
SUSE Manager Server 4.0 perl-Net-DNS Affected
SUSE Manager Server 4.1 perl-Net-DNS Affected
SUSE Manager Server 4.2 perl-Net-DNS Affected
SUSE OpenStack Cloud 7 perl-Net-DNS Affected
SUSE OpenStack Cloud 8 perl-Net-DNS Affected
SUSE OpenStack Cloud 9 perl-Net-DNS Affected
SUSE OpenStack Cloud Crowbar 8 perl-Net-DNS Affected
SUSE OpenStack Cloud Crowbar 9 perl-Net-DNS Affected
openSUSE Leap 15.3 perl-Net-DNS Affected
openSUSE Leap 15.4 perl-Net-DNS Affected
openSUSE Leap 15.5 perl-Net-DNS Affected
openSUSE Leap 15.6 perl-Net-DNS Affected


SUSE Timeline for this CVE

CVE page created: Wed Jul 22 11:39:27 2026
CVE page last modified: Wed Jul 22 11:39:27 2026