CVE-2026-54610
LibreDWG: const-input mutation and crash in bit_TV_to_utf8 error handling
LibreDWG is a free C library to read and write DWG files. Prior to 0.14, `bit_TV_to_utf8()` in `src/bits.c` can write to the caller-provided `src` buffer despite accepting const input. On an `iconv()` error other than `E2BIG`, the function frees its output buffer and passes the original input alias to `bit_u_expand()`, which expands or shrinks Unicode and multibyte escape sequences in place. If the input is a string literal, read-only mapping, or other immutable buffer, the write can cause a segmentation fault and denial of service; mutable caller-owned input can be unexpectedly modified before being returned. This affects applications that expose the conversion API to untrusted input under those conditions. Direct file-triggered exploitability through normal DWG decode/export paths remains unconfirmed because many TV strings are heap allocated by bit_read_TV(). This issue is fixed in version 0.14.
Fixes and workarounds
Fix
LibreDWG (c/c++): GitHub reports patched versions 0.14. Check the advisory for the affected release branch.
Source: GitHub GHSA-5p98-8245-6hxqAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| libredwg LibreDWG |
< 0.14 (affected) | CNA: GitHub_M |
LibreDWGLibreDWG
c/c++ |
<= 0.13.4.8236， (affected, GitHub advisory range) | GitHub GHSA-5p98-8245-6hxq |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 3.3 low |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L | CNA: GitHub_M |
| 3.1 / 3.3 low |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L | NVD: [email protected] |
Exploit evidence
- https://github.com/LibreDWG/libredwg/security/advisories/GHSA-5p98-8245-6hxq
exploit · ADP: CISA-ADP
References
- https://github.com/LibreDWG/libredwg/security/advisories/GHSA-5p98-8245-6hxqCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/LibreDWG/libredwg/commit/08c034a224a4e9512b1cd62e74b5cf081a4cfa89CNA: GitHub_M · x_refsource_MISC
- https://github.com/LibreDWG/libredwg/releases/tag/0.14CNA: GitHub_M · x_refsource_MISC
- https://github.com/user-attachments/files/28631091/libredwg-bit-tv-to-utf8-submission.tar.gzCNA: GitHub_M · x_refsource_MISC
- https://github.com/LibreDWG/libredwg/security/advisories/GHSA-5p98-8245-6hxqADP: CISA-ADP · exploit
- https://github.com/LibreDWG/libredwg/commit/08c034a224a4e9512b1cd62e74b5cf081a4cfa89[email protected]
- https://github.com/LibreDWG/libredwg/releases/tag/0.14[email protected]
- https://github.com/LibreDWG/libredwg/security/advisories/GHSA-5p98-8245-6hxq[email protected]
- https://github.com/user-attachments/files/28631091/libredwg-bit-tv-to-utf8-submission.tar.gz[email protected]
- https://github.com/LibreDWG/libredwg/security/advisories/GHSA-5p98-8245-6hxqGitHub Security Advisories · advisory
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