# CVE-2026-15182: GNU LibreDWG heap buffer overflow in BMP Image Handler

Source: https://junglewise.ai/threats/cve-2026-15182-gnu-libredwg-heap-buffer-overflow-in-bmp-image-handler  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-09. Updated: 2026-07-09  
License: CC BY 4.0 with a link back

CVE-2026-15182 · Severity: medium · CVSS 5.3 · Published 2026-07-09

GNU LibreDWG is a software library used to read and write DWG files, which are standard files for computer-aided design (CAD). A security flaw in how the library handles BMP images within these files could allow an attacker to crash the application or potentially execute unauthorized code. To exploit this, an attacker would need to convince a user to process a specially crafted, malicious CAD file on their local system.

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

## Quick answers

**Is CVE-2026-15182 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15182 being exploited in the wild.

**How severe is CVE-2026-15182?** Medium severity, with a CVSS score of 5.3, published 9 July 2026.

**Which products and versions are affected?** Gnu LibreDWG up to 0.13.4.

**Is there a fix for CVE-2026-15182?** A patch was published on 2026-07-09: Version 0.14 released with fix Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-15182 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-15182?** 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 heap-based buffer overflow exists in GNU LibreDWG versions up to 0.13.4 within the dwg_bmp function in src/dwg.c. The vulnerability is caused by improper overflow checks when processing BMP thumbnails, specifically failing to account for bytes already consumed by header entries and potential unsigned integer underflows during size calculations. An attacker can exploit this by providing a malformed DWG file to a tool using the library (such as dwgbmp), leading to an out-of-bounds read or write. The issue was addressed in version 0.14 by implementing stricter bounds checking and guarding against underflow conditions.

## Affected products

- GNU LibreDWG up to 0.13.4

## Timeline

- 2026-04-22: disclosed: Initial issue report on GitHub (#1249)
- 2026-04-29: other: Follow-up issue report indicating incomplete fix (#1252)
- 2026-07-09: advisory: CVE published to NVD
- 2026-07-09: patched: Version 0.14 released with fix

## References

- [https://github.com/HackC0der/CVE-Repos/blob/main/libredwg/libredwg_0b57303_heap_overflow_decode_R13_R2000.dwg](https://github.com/HackC0der/CVE-Repos/blob/main/libredwg/libredwg_0b57303_heap_overflow_decode_R13_R2000.dwg)
- [https://github.com/LibreDWG/libredwg/commit/18fd542bb4d5ccedf9de12052bf50068b2b26f06](https://github.com/LibreDWG/libredwg/commit/18fd542bb4d5ccedf9de12052bf50068b2b26f06)
- [https://github.com/LibreDWG/libredwg/issues/1249](https://github.com/LibreDWG/libredwg/issues/1249)
- [https://github.com/LibreDWG/libredwg/issues/1252](https://github.com/LibreDWG/libredwg/issues/1252)
- [https://github.com/LibreDWG/libredwg/releases/tag/0.14](https://github.com/LibreDWG/libredwg/releases/tag/0.14)
- [https://vuldb.com/cve/CVE-2026-15182](https://vuldb.com/cve/CVE-2026-15182)
- [https://vuldb.com/submit/851191](https://vuldb.com/submit/851191)

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