CVE-2022-28101: Turtlapp Turtle Note v0.7.2.6 does not filter the <meta> tag during markdown parsing, allowing attackers to ex

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CRITICAL 9.0DOWNGRADEDOWNGRADE

CVE-2022-28101 is a critical-severity flaw (CVSS 9.0) affecting turtl, turtl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Turtlapp Turtle Note v0.7.2.6 does not filter the <meta> tag during markdown parsing, allowing attackers to execute HTML injection.

Why this priority

Critical severity
Public exploit reference

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

Risk facts

CVSS score	9.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-04-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: lyonbros

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

Am I affected?

Timeline

2022-04-28 14:15 UTCPublished CVE record published
2026-06-17 04:37 UTCUpdated Record last modified

lyonbros turtl DOWNGRADE

Affected: 0.7.2.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.7.2.6

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.7.2.6 (Debian / Ubuntu)

apt-cache madison turtl sudo apt install turtl=<VERSION_BEFORE_0.7.2.6> sudo apt-mark hold turtl

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

dnf --showduplicates list turtl sudo dnf downgrade turtl-<VERSION_BEFORE_0.7.2.6> sudo dnf versionlock add turtl

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.

lyonbros turtl DOWNGRADE

Affected: 0.7.2.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.7.2.6

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.7.2.6 (Debian / Ubuntu)

apt-cache madison turtl sudo apt install turtl=<VERSION_BEFORE_0.7.2.6> sudo apt-mark hold turtl

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

dnf --showduplicates list turtl sudo dnf downgrade turtl-<VERSION_BEFORE_0.7.2.6> sudo dnf versionlock add turtl

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-2022-28101?

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

Is CVE-2022-28101 being exploited?

CVE-2022-28101 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-2022-28101 affect?

CVE-2022-28101 affects turtl, turtl. Severity is critical (CVSS 9.0). Turtlapp Turtle Note v0.7.2.6 does not filter the <meta> tag during markdown parsing, allowing attackers to execute HTML injection.

How urgent is CVE-2022-28101?

Priority 52/100. Critical severity; Public exploit reference

References

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