Upstream information
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 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 |
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Please note that this evaluation state might be work in progress, incomplete or outdated.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 2026CVE page last modified: Wed Jul 22 11:39:27 2026