xschem 2.9.9 through 3.4.7 Heap Out-of-Bounds Write via rawtovcd read_dataset()

Advisories

xschem 2.9.9 through 3.4.7 Heap Out-of-Bounds Write via rawtovcd read_dataset()

Severity: high
Date: 11/13/2026
Affecting: xschem >= 2.9.9, <= 3.4.7
CVE: CVE-2026-128990
CWE: CWE-787 Out-of-bounds Write
CVSS: 8.5
CVSS V4 Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References: https://github.com/StefanSchippers/xschem/commit/e29af39c6133c36bdaf66603fd663231e75517f1
https://github.com/StefanSchippers/xschem/blob/3.4.7/src/rawtovcd.c#L124-L148
https://github.com/StefanSchippers/xschem
Credit: Deus Rex
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.

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