---
id: CVE-2026-62250
title: 'LibreDWG: unbounded allocation in pre-R13 DWG entity decoding'
summary: >-
  LibreDWG is a free C library to read and write DWG files. Prior to 0.14.8413,
  a crafted pre-R13 DWG can make `decode_preR13_entities()` in `src/decode.c`
  enter a nonterminating loop that allocates a new object each iteration.
  `decode_pre…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-835
  - CWE-400
vendor: LibreDWG
product: libredwg
affected:
  - libredwg < 0.14.8413
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-30T21:18:21.594623Z'
published: '2026-10-30'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T22:12:48.952Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-62250'
references:
  - url: >-
      https://github.com/LibreDWG/libredwg/security/advisories/GHSA-7625-26gc-xqvp
    label: >-
      https://github.com/LibreDWG/libredwg/security/advisories/GHSA-7625-26gc-xqvp
  - url: 'https://github.com/LibreDWG/libredwg/issues/1131'
    label: 'https://github.com/LibreDWG/libredwg/issues/1131'
  - url: >-
      https://github.com/LibreDWG/libredwg/commit/4e14952c43be5b8feff6e54a61af3425d6ca95a4
    label: >-
      https://github.com/LibreDWG/libredwg/commit/4e14952c43be5b8feff6e54a61af3425d6ca95a4
  - url: 'https://github.com/LibreDWG/libredwg/releases/tag/0.14.8413'
    label: 'https://github.com/LibreDWG/libredwg/releases/tag/0.14.8413'
tags:
  - cve.org
epss: 0.00165
epssPercentile: 0.05792
ingestedAt: '2026-11-05T16:24:31.472Z'
---

## Overview

LibreDWG is a free C library to read and write DWG files. Prior to 0.14.8413, a crafted pre-R13 DWG can make `decode_preR13_entities()` in `src/decode.c` enter a nonterminating loop that allocates a new object each iteration. `decode_preR13` in `src/decode_r11.c` computes `size` from the raw file-controlled `entities_start` and `entities_end` header bounds; the callee clamps `end` to `dat->size` but never recalculates `size`. At `end` of input, `bit_read_RC` and `bit_read_RS` stop advancing `dat->byte`, the overflow guard fails because `end` equals `dat->size`, and the no-advance check compares against `oldpos` saved before the loop instead of the previous iteration. This leaves repeated allocation of `dwg->object` entries until allocation fails or the process is OOM-killed, not merely a constant-memory CPU hang. The defect remains after the clamping and no-progress changes associated with the earlier issue 1131. Applications and tools calling `dwg_read_file()` on untrusted files, including `dwg2dxf`, `dwgread` and `dwg2svg`, can suffer denial of service when a user or automated pipeline opens a malformed file; no attacker credentials are required. This issue is fixed in repository nightly version 0.14.8413.

## Affected

- `libredwg < 0.14.8413`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.