CVE-2023-35702

Multiple stack-based buffer overflow vulnerabilities exist in the FST LEB128 varint functionality...

7.8 HighFix available

Multiple stack-based buffer overflow vulnerabilities exist in the FST LEB128 varint functionality of GTKWave 3.3.115. A specially crafted .fst file can lead to arbitrary code execution. A victim would need to open a malicious file to trigger these vulnerabilities.This vulnerability concerns the fstReaderVarint32 function.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.43%Up 0.4 points since Jan 10, 2024

What each source reports

CVE List Score used 7.8

Record: CVE-2023-35702
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-121
Updated: 2026-11-02

EUVDEUVD-2023-39701 7.8

Record: EUVD-2023-39701
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-h2f9-xfxp-2rvx 7.8

Multiple stack-based buffer overflow vulnerabilities exist in the FST LEB128 varint functionality...

Record: GHSA-h2f9-xfxp-2rvx
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-121, CWE-787
Updated: 2026-11-02

NVD 7.8

Record: CVE-2023-35702
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-121, CWE-787
Updated: 2026-11-02

OSV 7.8

Record: CVE-2023-35702
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2023-35702 7.8

Record: DEBIAN-CVE-2023-35702
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2023-35702 7.8

Record: UBUNTU-CVE-2023-35702
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`gtkwave` Debian:12	before 3.3.118-0.1~deb12u1, plus listed versions 3.3.114-23.3.115-13.3.116-1	3.3.118-0.1~deb12u1
`gtkwave` Debian:13	before 3.3.118-0.1	3.3.118-0.1
`gtkwave` Debian:14	before 3.3.118-0.1	3.3.118-0.1
`gtkwave` Debian:10 From an advisory covering 82 CVEs	before 3.3.98+really3.3.118-0+deb10u1, plus listed versions 3.3.98-1	3.3.98+really3.3.118-0+deb10u1
`gtkwave` Debian:11 From an advisory covering 82 CVEs	before 3.3.104+really3.3.118-0+deb11u1, plus listed versions 3.3.104-2	3.3.104+really3.3.118-0+deb11u1
`gtkwave` Debian:12 From an advisory covering 82 CVEs	before 3.3.118-0.1~deb12u1, plus listed versions 3.3.114-23.3.115-13.3.116-1	3.3.118-0.1~deb12u1
`gtkwave` Ubuntu:16.04:LTS	All versions, plus listed versions 3.3.66-1	None known
`gtkwave` Ubuntu:18.04:LTS	All versions, plus listed versions 3.3.82-13.3.86-1	None known
`gtkwave` Ubuntu:20.04:LTS	All versions, plus listed versions 3.3.101-23.3.102-13.3.103-13.3.103-1build1	None known
`gtkwave` Ubuntu:22.04:LTS	All versions, plus listed versions 3.3.104-23.3.104-2build1	None known

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Affected packages
Package	Affected	Fixed
`gtkwave` Ubuntu:24.04:LTS	All versions, plus listed versions 3.3.116-13.3.116-1build13.3.116-1build2	None known
`gtkwave` Ubuntu:25.10	All versions, plus listed versions 3.3.121-13.3.125-1	None known
`gtkwave` Ubuntu:26.10	All versions, plus listed versions 3.3.126-13.3.127-1	None known
`gtkwave` Ubuntu:26.04:LTS	All versions, plus listed versions 3.3.125-13.3.126-1	None known

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-35702 is a high vulnerability (CVSS 7.8) in Gtkwave, published January 8, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.43%, the 37th percentile. Fixed in gtkwave 3.3.118-0.1~deb12u1.