CVE-2019-1010260: Using ktlint to download and execute custom rulesets can result in arbitrary code execution as the served jars

Q: How do I fix CVE-2019-1010260?

ktlint: upgrade to 0.30.0. Exact commands for each OS are on this page.

Q: Is CVE-2019-1010260 being exploited?

CVE-2019-1010260 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-1010260 affect?

CVE-2019-1010260 affects ktlint. Severity is high (CVSS 8.1). Using ktlint to download and execute custom rulesets can result in arbitrary code execution as the served jars can be compromised by a MITM. This attack is exploitable via Man in the Middle of the HTTP connection to the artifact servers. Th

Q: How urgent is CVE-2019-1010260?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 8.1REMOTEUPGRADE

CVE-2019-1010260 is a high-severity flaw (CVSS 8.1) affecting ktlint. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Using ktlint to download and execute custom rulesets can result in arbitrary code execution as the served jars can be compromised by a MITM. This attack is exploitable via Man in the Middle of the HTTP connection to the artifact servers. This vulnerability appears to have been fixed in 0.30.0 and later; after commit 5e547b287d6c260d328a2cb658dbe6b7a7ff2261.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-319
Published	2019-04-02
Last modified	2026-06-17

Publisher (CNA): DWF · Vendor: ktlint project

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

Am I affected?

Timeline

2019-04-02 15:29 UTCPublished CVE record published
2026-06-17 02:09 UTCUpdated Record last modified

ktlint project ktlint UPGRADE

Affected: < 0.30.0

Fixed in: 0.30.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.30.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ktlint

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ktlint

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2019-1010260?

ktlint: upgrade to 0.30.0. Exact commands for each OS are on this page.

Is CVE-2019-1010260 being exploited?

CVE-2019-1010260 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-2019-1010260 affect?

CVE-2019-1010260 affects ktlint. Severity is high (CVSS 8.1). Using ktlint to download and execute custom rulesets can result in arbitrary code execution as the served jars can be compromised by a MITM. This attack is exploitable via Man in the Middle of the HTTP connection to the artifact servers. Th

How urgent is CVE-2019-1010260?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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