CVE-2026-9504: GNU LibreDWG out-of-bounds read in Dwggrep Utility

CVE-2026-9504 · Severity: low · CVSS 3.3 · Published 2026-05-25

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 search utility could allow a local user to read sensitive information from the computer's memory by providing a specially crafted, malformed DWG file. This could lead to minor data exposure or be used as part of a more complex attack chain.

Technologies: Gnu LibreDWG. Vendors: Gnu.

Quick answers

Is CVE-2026-9504 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-9504 being exploited in the wild.
How severe is CVE-2026-9504?
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-2026-9504?
A patch was published on 2026-05-25: Patch commit be996bf2178a40e98720f18c2414815d244413db released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-9504 attacked?
It is attacked with local access, in a software library.
Am I affected by CVE-2026-9504?
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 GNU LibreDWG versions up to 0.14 within the Dwggrep Utility. The flaw is located in the bit_convert_TU function in programs/dwggrep.c (and src/bits.c). When processing a malformed DWG file, specifically during an LTYPE search, the application may fail to find a wide null terminator in the binary buffer. This causes the scanner to read past the allocated heap buffer. An attacker with local access can exploit this by providing a crafted DWG file to the dwggrep tool, potentially leading to information disclosure from heap memory. A patch has been released (commit be996bf) which introduces bounded conversion functions.

Affected products

  • GNU LibreDWG up to 0.14

Timeline

  • 2026-05-25: advisory: Initial disclosure by VulDB
  • 2026-05-25: disclosed
  • 2026-05-25: patched: Patch commit be996bf2178a40e98720f18c2414815d244413db released

References

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