CVE-2026-62254

MEDIUM 5.5

LibreDWG: excessive class-decoding reallocation in R13-R2000 DWG parsing

CVSS Score

5.5

EPSS Score

0.0%

EPSS Percentile

0th

LibreDWG is a free C library to read and write DWG files. Prior to 0.14, a specially crafted R13-R2000 DWG can trigger algorithmic resource exhaustion in `decode_R13_R2000` in `src/decode.c`. The class-decoding loop performs `realloc` on every iteration without a sanity check on `num_classes`. Manipulating that field forces an extremely slow allocation loop and denial of service when the file is parsed. Running the parser in a sandbox with memory limits is a workaround rather than a remediation. This issue is fixed in version 0.14.

CWE	CWE-400 CWE-789
Vendor	libredwg
Product	libredwg
Published	Oct 30, 2026

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CVSS v3 Breakdown

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

LibreDWG / libredwg

< 0.14

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/LibreDWG/libredwg/security/advisories/GHSA-gp83-hcvh-g255 github.com: https://github.com/LibreDWG/libredwg/issues/1261 github.com: https://github.com/LibreDWG/libredwg/commit/9de893a2e395ff5ac104a46cca54c5e2cf8f02cf github.com: https://github.com/LibreDWG/libredwg/releases/tag/0.14