CVE-2026-54610 (GCVE-0-2026-54610)

Vulnerability from cvelistv5 – Published: 2026-10-30 20:39 – Updated: 2026-10-30 20:39
VLAI
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 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.
Severity
3.3 (Low)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
CWE
  • CWE-471 - Modification of Assumed-Immutable Data (MAID)
  • CWE-703 - Improper Check or Handling of Exceptional Conditions
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 8129 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
LibreDWG libredwg Affected: < 0.14
guessed Create a notification for this product.
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "libredwg",
          "vendor": "LibreDWG",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.14"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "LOW",
            "baseScore": 3.3,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-471",
              "description": "CWE-471: Modification of Assumed-Immutable Data (MAID)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-703",
              "description": "CWE-703: Improper Check or Handling of Exceptional Conditions",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T20:39:19.805Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/LibreDWG/libredwg/security/advisories/GHSA-5p98-8245-6hxq",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/LibreDWG/libredwg/security/advisories/GHSA-5p98-8245-6hxq"
        },
        {
          "name": "https://github.com/LibreDWG/libredwg/commit/08c034a224a4e9512b1cd62e74b5cf081a4cfa89",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/LibreDWG/libredwg/commit/08c034a224a4e9512b1cd62e74b5cf081a4cfa89"
        },
        {
          "name": "https://github.com/LibreDWG/libredwg/releases/tag/0.14",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/LibreDWG/libredwg/releases/tag/0.14"
        },
        {
          "name": "https://github.com/user-attachments/files/28631091/libredwg-bit-tv-to-utf8-submission.tar.gz",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/user-attachments/files/28631091/libredwg-bit-tv-to-utf8-submission.tar.gz"
        }
      ],
      "source": {
        "advisory": "GHSA-5p98-8245-6hxq",
        "discovery": "UNKNOWN"
      },
      "title": "LibreDWG: const-input mutation and crash in bit_TV_to_utf8 error handling"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54610",
    "datePublished": "2026-10-30T20:39:19.805Z",
    "dateReserved": "2026-06-15T19:45:23.540Z",
    "dateUpdated": "2026-10-30T20:39:19.805Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "libredwg",
                "vendor": "LibreDWG",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 0.14"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "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."
          }
        ],
        "id": "CVE-2026-54610",
        "lastModified": "2026-10-30T21:16:57.520",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "LOW",
                "baseScore": 3.3,
                "baseSeverity": "LOW",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 1.4,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-30T21:16:57.520",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/LibreDWG/libredwg/commit/08c034a224a4e9512b1cd62e74b5cf081a4cfa89"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/LibreDWG/libredwg/releases/tag/0.14"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/LibreDWG/libredwg/security/advisories/GHSA-5p98-8245-6hxq"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/user-attachments/files/28631091/libredwg-bit-tv-to-utf8-submission.tar.gz"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Received",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-471"
              },
              {
                "lang": "en",
                "value": "CWE-703"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



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