CVE-2026-54610
Full vulnerability record from the local CVENow database.
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.
View original CVE JSON
{
"id": "CVE-2026-54610",
"sourceIdentifier": "[email protected]",
"published": "2026-10-30T21:16:57.520",
"lastModified": "2026-10-30T21:16:57.520",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "LibreDWG",
"product": "libredwg",
"versions": [
{
"version": "< 0.14",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
"baseScore": 3.3,
"baseSeverity": "LOW",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "REQUIRED",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "LOW"
},
"exploitabilityScore": 1.8,
"impactScore": 1.4
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-471"
},
{
"lang": "en",
"value": "CWE-703"
}
]
}
],
"references": [
{
"url": "https://github.com/LibreDWG/libredwg/commit/08c034a224a4e9512b1cd62e74b5cf081a4cfa89",
"source": "[email protected]"
},
{
"url": "https://github.com/LibreDWG/libredwg/releases/tag/0.14",
"source": "[email protected]"
},
{
"url": "https://github.com/LibreDWG/libredwg/security/advisories/GHSA-5p98-8245-6hxq",
"source": "[email protected]"
},
{
"url": "https://github.com/user-attachments/files/28631091/libredwg-bit-tv-to-utf8-submission.tar.gz",
"source": "[email protected]"
}
]
}