{"id":"CVE-2026-54610","title":"LibreDWG: const-input mutation and crash in bit_TV_to_utf8 error handling","summary":"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 functi…","severity":"low","cvss":3.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","cvssSource":"cna","cwe":["CWE-471","CWE-703"],"vendor":"LibreDWG","product":"libredwg","affected":["libredwg < 0.14"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T02:47:14.068437Z"},"exploitAvailable":true,"published":"2026-10-30","updated":"2026-11-05","sourceUpdated":"2026-11-05T02:47:43.120Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-54610","references":[{"url":"https://github.com/LibreDWG/libredwg/security/advisories/GHSA-5p98-8245-6hxq","label":"https://github.com/LibreDWG/libredwg/security/advisories/GHSA-5p98-8245-6hxq"},{"url":"https://github.com/LibreDWG/libredwg/commit/08c034a224a4e9512b1cd62e74b5cf081a4cfa89","label":"https://github.com/LibreDWG/libredwg/commit/08c034a224a4e9512b1cd62e74b5cf081a4cfa89"},{"url":"https://github.com/LibreDWG/libredwg/releases/tag/0.14","label":"https://github.com/LibreDWG/libredwg/releases/tag/0.14"},{"url":"https://github.com/user-attachments/files/28631091/libredwg-bit-tv-to-utf8-submission.tar.gz","label":"https://github.com/user-attachments/files/28631091/libredwg-bit-tv-to-utf8-submission.tar.gz"}],"tags":["cve.org","exploit-available"],"epss":0.00118,"epssPercentile":0.01732,"ingestedAt":"2026-11-05T21:36:00.711Z","slug":"CVE-2026-54610","body":"## Overview\n\nLibreDWG 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.\n\n## Affected\n\n- `libredwg < 0.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":30,"depthScoreParts":{"impact":18.2,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}