CVE-2023-38623: Multiple integer overflow vulnerabilities exist in the VZT facgeometry parsing functionality of GTKWave 3.3.11

This month

HIGH 7.8DOWNGRADE

CVE-2023-38623 is a high-severity flaw (CVSS 7.8) affecting gtkwave. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple integer overflow vulnerabilities exist in the VZT facgeometry parsing functionality of GTKWave 3.3.115. A specially crafted .vzt file can lead to arbitrary code execution. A victim would need to open a malicious file to trigger these vulnerabilities.This vulnerability concerns the integer overflow when allocating the `vindex_offset` array.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-190
Published	2024-01-08
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: tonybybell

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-01-08 15:15 UTCPublished CVE record published
2026-06-17 06:10 UTCUpdated Record last modified

tonybybell gtkwave DOWNGRADE

Affected: 3.3.115

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.3.115

1. Check installed version

apt-cache policy gtkwave || rpm -q gtkwave || gtkwave --version

2. No fixed release: DOWNGRADE to a release before 3.3.115 (Debian / Ubuntu)

apt-cache madison gtkwave sudo apt install gtkwave=<VERSION_BEFORE_3.3.115> sudo apt-mark hold gtkwave

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list gtkwave sudo dnf downgrade gtkwave-<VERSION_BEFORE_3.3.115> sudo dnf versionlock add gtkwave

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-38623?

gtkwave: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-38623 being exploited?

CVE-2023-38623 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-38623 affect?

CVE-2023-38623 affects gtkwave. Severity is high (CVSS 7.8). Multiple integer overflow vulnerabilities exist in the VZT facgeometry parsing functionality of GTKWave 3.3.115. A specially crafted .vzt file can lead to arbitrary code execution. A victim would need to open a malicious file to trigger the

How urgent is CVE-2023-38623?

Priority 42/100. High severity; Public exploit reference

Related CVEs

CVE-2023-39444 HIGH 7.8 DOWNGRADE Multiple out-of-bounds write vulnerabilities exist in the LXT2 parsing functionality of GTKWave 3.3.115
CVE-2023-39443 HIGH 7.8 DOWNGRADE Multiple out-of-bounds write vulnerabilities exist in the LXT2 parsing functionality of GTKWave 3.3.115
CVE-2023-39414 HIGH 7.0 DOWNGRADE Multiple integer underflow vulnerabilities exist in the LXT2 lxt2_rd_iter_radix shift operation functionality
CVE-2023-39413 HIGH 7.0 DOWNGRADE Multiple integer underflow vulnerabilities exist in the LXT2 lxt2_rd_iter_radix shift operation functionality
CVE-2023-39317 HIGH 7.8 DOWNGRADE Multiple integer overflow vulnerabilities exist in the LXT2 num_dict_entries functionality of GTKWave 3.3.115

References

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