Vulnerability Description
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.
CVSS Score
LOW
Related Weaknesses (CWE)
References
- https://github.com/LibreDWG/libredwg/commit/08c034a224a4e9512b1cd62e74b5cf081a4c
- https://github.com/LibreDWG/libredwg/releases/tag/0.14
- https://github.com/LibreDWG/libredwg/security/advisories/GHSA-5p98-8245-6hxq
- https://github.com/user-attachments/files/28631091/libredwg-bit-tv-to-utf8-submi
FAQ
What is CVE-2026-54610?
CVE-2026-54610 is a vulnerability with a CVSS score of 3.3 (LOW). 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()`...
How severe is CVE-2026-54610?
CVE-2026-54610 has been rated LOW with a CVSS base score of 3.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54610?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.