CVE-2018-17567: Jekyll through 3.6.2, 3.7.x through 3.7.3, and 3.8.x through 3.8.3 allows attackers to access arbitrary files

This month

HIGH 7.5REMOTEUPGRADE

CVE-2018-17567 is a high-severity flaw (CVSS 7.5) affecting jekyll. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Jekyll through 3.6.2, 3.7.x through 3.7.3, and 3.8.x through 3.8.3 allows attackers to access arbitrary files by specifying a symlink in the "include" key in the "_config.yml" file.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Weakness	CWE-59
Published	2018-09-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jekyllrb

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

Am I affected?

Timeline

2018-09-28 00:29 UTCPublished CVE record published
2026-06-17 01:46 UTCUpdated Record last modified

jekyllrb jekyll UPGRADE

Affected: <= 3.6.2 · >= 3.7.0 and <= 3.7.3 · >= 3.8.0 and <= 3.8.3

Fixed in: newer than 3.8.3

Safe to downgrade to: a release before 3.7.0

1. Check installed version

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

2. UPGRADE to newer than 3.8.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jekyll

Note

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

3. If no update is available yet, DOWNGRADE to a release before 3.7.0 (Debian / Ubuntu)

apt-cache madison jekyll sudo apt install jekyll=<VERSION_BEFORE_3.7.0> sudo apt-mark hold jekyll

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jekyll sudo dnf downgrade jekyll-<VERSION_BEFORE_3.7.0> sudo dnf versionlock add jekyll

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-2018-17567?

jekyll: upgrade to newer than 3.8.3. Exact commands for each OS are on this page.

Is CVE-2018-17567 being exploited?

CVE-2018-17567 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-2018-17567 affect?

CVE-2018-17567 affects jekyll. Severity is high (CVSS 7.5). Jekyll through 3.6.2, 3.7.x through 3.7.3, and 3.8.x through 3.8.3 allows attackers to access arbitrary files by specifying a symlink in the "include" key in the "_config.yml" file.

How urgent is CVE-2018-17567?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

References

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