# CVE-2026-9503: GNU LibreDWG null pointer dereference in dwg_next_entity

Source: https://junglewise.ai/threats/cve-2026-9503-gnu-libredwg-null-pointer-dereference-in-dwg-next-entity  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-25. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-9503 · Severity: low · CVSS 3.3 · Published 2026-05-25

A security vulnerability exists in GNU LibreDWG, a library used for reading and writing DWG files (AutoCAD drawings). An attacker could provide a specially crafted drawing file that causes the software to crash when processed. This results in a denial-of-service condition, potentially disrupting operations that rely on automated drawing conversions or processing.

Technologies: [Gnu LibreDWG](https://junglewise.ai/threats/technologies/libredwg). Vendors: [Gnu](https://junglewise.ai/threats/vendors/gnu).

## Quick answers

**Is CVE-2026-9503 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9503 being exploited in the wild.

**How severe is CVE-2026-9503?** Low severity, with a CVSS score of 3.3, published 25 May 2026.

**Which products and versions are affected?** Gnu LibreDWG up to 0.14.

**Is there a fix for CVE-2026-9503?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-9503 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-9503?** Check whether you run Gnu LibreDWG at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A NULL pointer dereference vulnerability exists in GNU LibreDWG up to version 0.14 within the dwg_next_entity function in src/decode.c (and dwg.c). The flaw is triggered during the processing of malformed DWG files, specifically when handling decompression overflows or entity traversal in the DWG File Handler. A local attacker can exploit this by providing a crafted DWG file to a utility using the library (such as dwg2SVG), causing a segmentation fault (SEGV) and application crash. A patch has been identified in commit 8f03865f37f5d4ffd616fef802acc980be54d300 which adds bounds checking for decompression sizes.

## Affected products

- GNU LibreDWG up to 0.14

## Timeline

- 2026-05-25: advisory: NVD publication date
- 2026-05-25: disclosed: Vulnerability details and exploit released to the public

## References

- [https://github.com/HackC0der/CVE-Repos/blob/main/libredwg/libredwg_6d6a339_heap_oob_write_read_2004_compressed_section.dwg](https://github.com/HackC0der/CVE-Repos/blob/main/libredwg/libredwg_6d6a339_heap_oob_write_read_2004_compressed_section.dwg)
- [https://github.com/LibreDWG/libredwg/commit/8f03865f37f5d4ffd616fef802acc980be54d300](https://github.com/LibreDWG/libredwg/commit/8f03865f37f5d4ffd616fef802acc980be54d300)
- [https://github.com/LibreDWG/libredwg/issues/1245](https://github.com/LibreDWG/libredwg/issues/1245)
- [https://vuldb.com/submit/814260](https://vuldb.com/submit/814260)
- [https://vuldb.com/vuln/365485](https://vuldb.com/vuln/365485)
- [https://vuldb.com/vuln/365485/cti](https://vuldb.com/vuln/365485/cti)
- [https://www.gnu.org/](https://www.gnu.org/)

## Related threats

- [GNU LibreDWG out-of-bounds read in AcDs decoder](https://junglewise.ai/threats/cve-2026-111167-gnu-libredwg-through-0-14-8612-contains-a-global-out-of-bounds)
- [GNU libredwg null pointer dereference in LAYER encoding](https://junglewise.ai/threats/cve-2026-90622-gnu-libredwg-null-pointer-dereference-in-layer-encoding)
- [GNU LibreDWG heap overflow in decompress_R2004_section](https://junglewise.ai/threats/cve-2026-15520-gnu-libredwg-heap-overflow-in-decompress-r2004-section)
- [GNU LibreDWG null pointer dereference in dwg_next_entity](https://junglewise.ai/threats/cve-2026-15184-gnu-libredwg-null-pointer-dereference-in-dwg-next-entity)
- [GNU LibreDWG heap buffer overflow in BMP Image Handler](https://junglewise.ai/threats/cve-2026-15182-gnu-libredwg-heap-buffer-overflow-in-bmp-image-handler)