CVE-2026-128990

Description

xschem 2.9.9 through 3.4.7 contains a heap out-of-bounds write vulnerability in read_dataset() in src/rawtovcd.c due to an unchecked variable index. Attackers can supply a crafted ngspice .raw file that, when converted with rawtovcd, writes file-controlled heap pointers at chosen signed offsets, corrupting heap memory.

References

• https://github.com/StefanSchippers/xschem
• https://github.com/StefanSchippers/xschem/blob/3.4.7/src/rawtovcd.c#L124-L148
• https://github.com/StefanSchippers/xschem/commit/e29af39c6133c36bdaf66603fd663231e75517f1
• https://www.vulncheck.com/advisories/xschem-2.9.9-through-3.4.7-heap-out-of-bounds-write-via-rawtovcd-read-dataset