What is CVE-2018-1000079?

CVE-2018-1000079 is a medium-severity vulnerability in Rubygems, classified under Path Traversal. CVSS score: 5.5/10. Published 2018-03-13.

How severe is CVE-2018-1000079?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2018-1000079 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Path Traversal in Rubygems

CVE-2018-1000079

RubyGems version Ruby 2.2 series: 2.2.9 and earlier, Ruby 2.3 series: 2.3.6 and earlier, Ruby 2.4 series: 2.4.3 and earlier, Ruby 2.5 series: 2.5.0 and earlier, prior to trunk revision 62422 contains a Directory Traversal vulnerability in gem installation that can result in the gem could write to arbitrary filesystem locations during installation. This attack appear to be exploitable via the victim must install a malicious gem. This vulnerability appears to have been fixed in 2.7.6.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2018-03-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.028 (85.9th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 85.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.028 · newest: 0.028 · change: 0.000

Affected products

Rubygems

Weakness classification (CWE)

CWE-22 — Path Traversal

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

www.debian.org/security/2018/dsa-4219 (vendor-advisory)
usn.ubuntu.com/3621-1/ (vendor-advisory)
access.redhat.com/errata/RHSA-2018:3729 (vendor-advisory)
github.com/rubygems/rubygems/commit/666ef793cad42eed96f7aee1cdf77865db921099 (Patch, Third Party Advisory)
access.redhat.com/errata/RHSA-2018:3730 (vendor-advisory)
access.redhat.com/errata/RHSA-2018:3731 (vendor-advisory)
lists.debian.org/debian-lts-announce/2018/07/msg00012.html (mailing-list)
www.debian.org/security/2018/dsa-4259 (vendor-advisory)
github.com/rubygems/rubygems/commit/f83f911e19e27cbac1ccce7471d96642241dd759 (Patch, Third Party Advisory)
blog.rubygems.org/2018/02/15/2.7.6-released.html (Vendor Advisory)

Frequently asked questions

What is CVE-2018-1000079?: CVE-2018-1000079 is a medium-severity vulnerability in Rubygems, classified under Path Traversal. CVSS score: 5.5/10. Published 2018-03-13.
How severe is CVE-2018-1000079?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2018-1000079 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.