CVE-2026-4545: A security flaw has been discovered in Flos Freeware Notepad2 4.2.25

Routine

HIGH 7.0DOWNGRADE

CVE-2026-4545 is a high-severity flaw (CVSS 7.0) affecting notepad2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A security flaw has been discovered in Flos Freeware Notepad2 4.2.25. This affects an unknown function in the library PROPSYS.dll. Performing a manipulation results in uncontrolled search path. The attack is only possible with local access. The attack is considered to have high complexity. The exploitability is reported as difficult. The vendor was contacted early about this disclosure but did not respond in any way.

Why this priority

High severity

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

Risk facts

CVSS score	7.0 (High)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-426, CWE-427
Published	2026-03-22
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: flos-freeware

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

Am I affected?

Timeline

2026-03-22 12:16 UTCPublished CVE record published
2026-06-17 10:56 UTCUpdated Record last modified

flos-freeware notepad2 DOWNGRADE

Affected: 4.2.25

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.2.25

1. Check installed version

apt-cache policy notepad2 || rpm -q notepad2 || notepad2 --version

2. No fixed release: DOWNGRADE to a release before 4.2.25 (Debian / Ubuntu)

apt-cache madison notepad2 sudo apt install notepad2=<VERSION_BEFORE_4.2.25> sudo apt-mark hold notepad2

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

dnf --showduplicates list notepad2 sudo dnf downgrade notepad2-<VERSION_BEFORE_4.2.25> sudo dnf versionlock add notepad2

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-2026-4545?

notepad2: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-4545 being exploited?

CVE-2026-4545 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-2026-4545 affect?

CVE-2026-4545 affects notepad2. Severity is high (CVSS 7.0). A security flaw has been discovered in Flos Freeware Notepad2 4.2.25. This affects an unknown function in the library PROPSYS.dll. Performing a manipulation results in uncontrolled search path. The attack is only possible with local access.

How urgent is CVE-2026-4545?

Priority 25/100. High severity

Related CVEs

CVE-2026-4546 HIGH 7.0 DOWNGRADE A weakness has been identified in Flos Freeware Notepad2 4.2.25

References

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