LibreDWG: const-input mutation and crash in bit_TV_to_utf8 error handling

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54610
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-30 21:16:57 UTC
Updated2026-10-30 21:16:57 UTC
DescriptionLibreDWG 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.

Risk And Classification

Primary CVSS: v3.1 3.3 LOW from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Problem Types: CWE-471 | CWE-703 | CWE-471 CWE-471: Modification of Assumed-Immutable Data (MAID) | CWE-703 CWE-703: Improper Check or Handling of Exceptional Conditions

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.3LOWCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
3.1CNADECLARED3.3LOWCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA LibreDWG Libredwg affected < 0.14 Not specified

References

ReferenceSourceLinkTags
github.com/LibreDWG/libredwg/security/advisories/GHSA-5p98-8245-6hxq [email protected] github.com
github.com/user-attachments/files/28631091/libredwg-bit-tv-to-utf8-submi... [email protected] github.com
github.com/LibreDWG/libredwg/commit/08c034a224a4e9512b1cd62e74b5cf081a4c... [email protected] github.com
github.com/LibreDWG/libredwg/releases/tag/0.14 [email protected] github.com
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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