CVE-2026-128990

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

Published Nov 13, 2026 CVSS 4.0 · 8.5 High EPSS n/a KEV · Not listed

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Stefan Schippers

xschem

unaffected

Version	Status	Constraints
`2.9.9`	affected	≤ 3.4.7

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

References

Link	Providers
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

History

Nov 13, 2026 3:15 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		xschem 2.9.9 through 3.4.7 Heap Out-of-Bounds Write via rawtovcd read_dataset()
Weaknesses		CWE-787
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
Metrics		cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}` cvssV4_0 `{'score': 8.5, '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'}`