GNU LibreDWG dwg_next_entity Null Pointer Dereference Vulnerability
A vulnerability was found in GNU LibreDWG up to 0.13.4. The impacted element is the function dwg_next_entity of the file src/dwg.c of the component DWG File Handler. Performing a manipulation of the argument next_obj results in null pointer dereference. The attack must be initiated from a local position. The exploit has been made public and could be used. Upgrading to version 0.14 is sufficient to resolve this issue. The patch is named dde45dac3c4d902e4d8fed150a8017b9732019c9. Upgrading the affected component is recommended. Different than CVE-2026-9503.
Quick answer
GNU LibreDWG should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- GNU LibreDWG up to 0.13.4
Fixed versions
- 0.14
How to fix it
GNU LibreDWG up to 0.13.4 is affected by a null pointer dereference in dwg_next_entity when processing DWG files. Upgrade to LibreDWG 0.14 or later and rebuild tools that embed the library. Prioritize services that process untrusted DWG files, even though the attack requires local file processing.
- Inventory LibreDWG installations and applications that process uploaded or untrusted DWG files.
- Upgrade GNU LibreDWG to version 0.14 or later.
- Rebuild dependent tools, containers, packages, and services that statically link LibreDWG.
- Process untrusted DWG files in a sandboxed worker with CPU, memory, and file-system limits.
- Review crash logs and submitted DWG samples for exploit attempts against dwg_next_entity.
- Quarantine suspicious DWG files processed before the upgrade.
- Add regression tests for malformed DWG object references.
Scan now. Google sign-in is only needed to unlock fix guidance.
Verify the fix
- Confirm LibreDWG reports version 0.14 or later in deployed tools.
- Validate malformed DWG files no longer trigger null pointer dereference crashes.
- Review processing logs for repeated crashes or suspicious samples.
- Test normal DWG conversion and parsing workflows after the update.
- Run a Fixnx scan for public file upload workflows if LibreDWG is used by the site.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-15184?
GNU LibreDWG versions listed as affected should be reviewed: GNU LibreDWG up to 0.13.4.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
Why can this risk appear in multiple categories?
A vulnerability can belong to more than one platform or ecosystem. Fixnx keeps one canonical risk page while also listing it in every relevant category.