CVE-2018-25271: Textpad 8.1.2 contains a denial of service vulnerability that allows local attackers to crash the application

Routine

MEDIUM 6.2DOWNGRADE

CVE-2018-25271 is a medium-severity flaw (CVSS 6.2) affecting textpad. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Textpad 8.1.2 contains a denial of service vulnerability that allows local attackers to crash the application by supplying an excessively long buffer string through the Run command interface. Attackers can paste a 5000-byte payload into the Command field via Tools > Run to trigger a buffer overflow that crashes the application.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.2 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-04-22
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: helios

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

Am I affected?

Timeline

2026-04-22 16:16 UTCPublished CVE record published
2026-06-17 01:55 UTCUpdated Record last modified

helios textpad DOWNGRADE

Affected: 8.1.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.1.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 8.1.2 (Debian / Ubuntu)

apt-cache madison textpad sudo apt install textpad=<VERSION_BEFORE_8.1.2> sudo apt-mark hold textpad

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

dnf --showduplicates list textpad sudo dnf downgrade textpad-<VERSION_BEFORE_8.1.2> sudo dnf versionlock add textpad

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-2018-25271?

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

Is CVE-2018-25271 being exploited?

CVE-2018-25271 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-2018-25271 affect?

CVE-2018-25271 affects textpad. Severity is medium (CVSS 6.2). Textpad 8.1.2 contains a denial of service vulnerability that allows local attackers to crash the application by supplying an excessively long buffer string through the Run command interface. Attackers can paste a 5000-byte payload into the

How urgent is CVE-2018-25271?

Priority 29/100. Public exploit reference

References

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