CVE-2026-126497: Memory Corruption (CVSS 7.8)

Description

LibreCAD through 2.2.1.6 contains a heap-based out-of-bounds write vulnerability in the bundled libdxfrw dwgReader18::parseDataPage() function due to unchecked buffer size and page offsets. Attackers can craft an AC1018 (R2004) DWG file with malicious startOffset values that cause decompress18 to write past the heap buffer when opened, causing crashes and potential code execution.

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CVSS v3.1 Score

7.8

HIGH

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

Weakness Type (CWE)

CWE-787 Out-of-bounds Write

References

Other References

https://github.com/LibreCAD/LibreCAD https://github.com/LibreCAD/LibreCAD/blob/v2.2.1.6/libraries/libdxfrw/src/intern/dwgreader18.cpp#L113-L173 https://github.com/LibreCAD/LibreCAD/commit/17ba2b273b89cc9c8b6fcf71882e327ccf1eebf6 https://github.com/LibreCAD/LibreCAD/issues/3256 https://www.vulncheck.com/advisories/librecad-through-2.2.1.6-heap-out-of-bounds-write-via-dwgreader18-parsedatapage

Frequently Asked Questions

What is CVE-2026-126497? +

LibreCAD through 2.2.1.6 contains a heap-based out-of-bounds write vulnerability in the bundled libdxfrw dwgReader18::parseDataPage() function due to unchecked buffer size and page offsets. Attackers can craft an AC1018 (R2004) DWG file with malicious startOffset values that cause decompress18 to write past the heap buffer when opened, causing crashes and potential code execution. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-126497? +

CVE-2026-126497 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2026-126497? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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