CVE-2023-35958: Multiple heap-based buffer overflow vulnerabilities exist in the fstReaderIterBlocks2 VCDATA parsing functiona

This month

HIGH 7.8DOWNGRADE

CVE-2023-35958 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 heap-based buffer overflow vulnerabilities exist in the fstReaderIterBlocks2 VCDATA parsing 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 copy function `fstFread`.

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-119
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 06:05 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-2023-35958?

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

Is CVE-2023-35958 being exploited?

CVE-2023-35958 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-2023-35958 affect?

CVE-2023-35958 affects gtkwave. Severity is high (CVSS 7.8). Multiple heap-based buffer overflow vulnerabilities exist in the fstReaderIterBlocks2 VCDATA parsing functionality of GTKWave 3.3.115. A specially-crafted .fst file can lead to arbitrary code execution. A victim would need to open a malicio

How urgent is CVE-2023-35958?

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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