CVE-2026-110606

LibreCAD libdxfrw through LC2.2.0 (LibreCAD through 2.2.1.5) contains a stack-based out-of-bounds read vulnerability in dwgReader18::readFileHeader() caused by calling strlen on non-NUL-terminated buffers. Attackers can supply a crafted AC1018, AC1024 or AC1027 DWG file without NUL bytes in the decrypted header to read adjacent stack memory and crash the process.

• https://github.com/LibreCAD/LibreCAD/blob/v2.2.1.5/libraries/libdxfrw/src/intern/dwgreader18.cpp#L248
• https://github.com/LibreCAD/LibreCAD/commit/abd1f4a8e32dbd871c986086227502217200cd4b
• https://github.com/LibreCAD/LibreCAD/issues/2554
• https://github.com/LibreCAD/libdxfrw/blob/LC2.2.0/src/intern/dwgreader18.cpp#L248
• https://github.com/LibreCAD/libdxfrw/commit/0c5595930b20917a40ed7c188475eaca624b8ce9
• https://hackmd.io/@haind-pwn/libdxfrw-dwg-header-oob-read
• https://www.vulncheck.com/advisories/librecad-libdxfrw-through-lc2-2.0-stack-out-of-bounds-read-via-dwgreader18-readfileheader
• https://github.com/LibreCAD/LibreCAD/issues/2554