Upstream information
Description
A stack-based buffer overflow vulnerability exists in the Dia diagram editor when processing Network Bus objects from Dia XML project files.In objects/network/bus.c, bus_load() reads the number of bus handles from the file attribute "bus_handles" using attribute_num_data() without validating an upper bound:
bus->num_handles = attribute_num_data(attr);
When a bus handle is subsequently moved, bus_handle_moved() allocates two temporary arrays on the stack:
parallel = (real *)g_alloca(num_handles * sizeof(real));
perp = (real *)g_alloca(num_handles * sizeof(real));
Because num_handles is fully attacker-controlled via the project file, sufficiently large values (for example 262144 or higher) cause g_alloca() to consume more stack space than the default thread stack limit (typically 8 MB on Linux), resulting in stack overflow, SIGSEGV, and potential stack frame / return-address corruption.
An attacker can embed a Bus object with an excessive bus_handles count in a malicious .dia file. Exploitation requires the victim to open the file in Dia (file dialog, command line, or file association) and trigger handle manipulation (moving a bus handle), which exercises the vulnerable code path.
The identical g_alloca pattern is present in objects/Misc/tree.c (copied from bus.c) and is likely vulnerable to the same class of attack via Tree objects.
Affected versions: Dia 0.98.0 and earlier versions containing this code; issue confirmed on upstream master as of 2026-08-21.
Upstream report: https://gitlab.gnome.org/GNOME/dia/-/issues/581
SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having important severity.
| CVSS detail | CNA (Fedora Project) | SUSE |
|---|---|---|
| Base Score | 7.8 | 7.8 |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| Attack Vector | Local | Local |
| Attack Complexity | Low | Low |
| Privileges Required | None | None |
| User Interaction | Required | Required |
| Scope | Unchanged | Unchanged |
| Confidentiality Impact | High | High |
| Integrity Impact | High | High |
| 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Please note that this evaluation state might be work in progress, incomplete or outdated.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 | dia | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | dia | Affected |
| SUSE Linux Enterprise Server 15 SP7 | dia | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | dia | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP7 | dia | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise Server 15 SP4 | dia | Affected |
| SUSE Linux Enterprise Server 15 SP5 | dia | Affected |
| SUSE Linux Enterprise Server 15 SP6 | dia | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | dia | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | dia | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | dia | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Linux Enterprise Desktop 15 | dia | Affected |
| SUSE Linux Enterprise Desktop 15 SP1 | dia | Affected |
| SUSE Linux Enterprise Desktop 15 SP2 | dia | Affected |
| SUSE Linux Enterprise Desktop 15 SP3 | dia | Affected |
| SUSE Linux Enterprise Desktop 15 SP4 | dia | Affected |
| SUSE Linux Enterprise Desktop 15 SP5 | dia | Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | dia | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP3 | dia | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP4 | dia | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | dia | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | dia | Affected |
| SUSE Linux Enterprise Server 15 | dia | Affected |
| SUSE Linux Enterprise Server 15 SP1 | dia | Affected |
| SUSE Linux Enterprise Server 15 SP2 | dia | Affected |
| SUSE Linux Enterprise Server 15 SP3 | dia | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 | dia | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | dia | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | dia | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | dia | Affected |
| SUSE Linux Enterprise Workstation Extension 15 | dia | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP1 | dia | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP2 | dia | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP3 | dia | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP4 | dia | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP5 | dia | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP6 | dia | Affected |
| openSUSE Leap 15.3 | dia | Affected |
| openSUSE Leap 15.4 | dia | Affected |
| openSUSE Leap 15.5 | dia | Affected |
| openSUSE Leap 15.6 | dia | Affected |
SUSE Timeline for this CVE
CVE page created: Wed Aug 26 11:48:15 2026CVE page last modified: Wed Aug 26 21:53:20 2026