# CVE-2026-9530: GNU LibreDWG out-of-bounds read in read_2004_compressed_section

Source: https://junglewise.ai/threats/cve-2026-9530-gnu-libredwg-out-of-bounds-read-in-read-2004-compressed-section  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-26. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-9530 · Severity: low · CVSS 3.3 · Published 2026-05-26

GNU LibreDWG is a library used for reading and writing DWG files, which are the standard format for computer-aided design (CAD) software. A vulnerability in the library's decompression logic could allow a local user to cause a program crash by providing a specially crafted DWG file. This could lead to a denial-of-service condition for applications that rely on this library to process CAD data.

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

## Quick answers

**Is CVE-2026-9530 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9530 being exploited in the wild.

**How severe is CVE-2026-9530?** Low severity, with a CVSS score of 3.3, published 26 May 2026.

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

**Is there a fix for CVE-2026-9530?** A patch was published on 2026-05-26: Patch commit 8f03865f37f5d4ffd616fef802acc980be54d300 identified Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-9530 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-9530?** 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

An out-of-bounds read vulnerability exists in the read_2004_compressed_section function within src/decode.c of GNU LibreDWG. The issue stems from insufficient bounds checking during the decompression of R2004 DWG sections, where an integer overflow or improper size validation allows a read access beyond the allocated heap buffer. An attacker with local access can exploit this by providing a manipulated DWG file to the Dwgbmp utility or other applications using the library. This can result in a crash (denial of service). A patch (commit 8f03865) has been released to address the decompression overflow by adding explicit checks for address and size wrapping.

## Affected products

- GNU LibreDWG up to 0.14

## Timeline

- 2026-04-22: disclosed: Issue reported on GitHub by HackC0der
- 2026-05-26: advisory: CVE-2026-9530 published
- 2026-05-26: patched: Patch commit 8f03865f37f5d4ffd616fef802acc980be54d300 identified

## 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/1248](https://github.com/LibreDWG/libredwg/issues/1248)
- [https://vuldb.com/submit/814275](https://vuldb.com/submit/814275)
- [https://vuldb.com/vuln/365549](https://vuldb.com/vuln/365549)
- [https://vuldb.com/vuln/365549/cti](https://vuldb.com/vuln/365549/cti)
- [https://www.gnu.org/](https://www.gnu.org/)

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