CVE-2023-54334: Explorer32++ 1.3.5.531 contains a buffer overflow vulnerability in Structured Exception Handler (SEH) records

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2023-54334 is a critical-severity flaw (CVSS 9.8) affecting explorer\+\+. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Explorer32++ 1.3.5.531 contains a buffer overflow vulnerability in Structured Exception Handler (SEH) records that allows attackers to execute arbitrary code. Attackers can exploit the vulnerability by providing a long file name argument over 396 characters to corrupt the SEH chain and potentially execute malicious code.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-121, CWE-787
Published	2026-01-13
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: explorerplusplus

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

Am I affected?

Timeline

2026-01-13 23:16 UTCPublished CVE record published
2026-06-17 06:47 UTCUpdated Record last modified

explorerplusplus explorer\+\+ DOWNGRADE

Affected: 1.3.5.531

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3.5.531

1. Check installed version

apt-cache policy explorer++ || rpm -q explorer++ || explorer++ --version

2. No fixed release: DOWNGRADE to a release before 1.3.5.531 (Debian / Ubuntu)

apt-cache madison explorer++ sudo apt install explorer++=<VERSION_BEFORE_1.3.5.531> sudo apt-mark hold explorer++

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

dnf --showduplicates list explorer++ sudo dnf downgrade explorer++-<VERSION_BEFORE_1.3.5.531> sudo dnf versionlock add explorer++

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · openjpeg · FIXED · 2.5.4-5.eln159 · FEDORA-2026-1a5f60f401 · source

sudo dnf upgrade --advisory=FEDORA-2026-1a5f60f401

Fedora 46 · trustedqsl · FIXED · 2.8.7-1.fc46 · FEDORA-2026-6b1bc90ebc · source

sudo dnf upgrade --advisory=FEDORA-2026-6b1bc90ebc

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: www.exploit-db.com/exploits/51077

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-2023-54334?

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

Is CVE-2023-54334 being exploited?

CVE-2023-54334 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-2023-54334 affect?

CVE-2023-54334 affects explorer\+\+. Severity is critical (CVSS 9.8). Explorer32++ 1.3.5.531 contains a buffer overflow vulnerability in Structured Exception Handler (SEH) records that allows attackers to execute arbitrary code. Attackers can exploit the vulnerability by providing a long file name argument ov

How urgent is CVE-2023-54334?

Priority 56/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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