What is CVE-2018-1000077?

CVE-2018-1000077 is a medium-severity vulnerability in Rubygems, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2018-03-13.

How severe is CVE-2018-1000077?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2018-1000077 known to be exploited?

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

Improper input validation in Rubygems

CVE-2018-1000077

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 Improper Input Validation vulnerability in ruby gems specification homepage attribute that can result in a malicious gem could set an invalid homepage URL. This vulnerability appears to have been fixed in 2.7.6.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

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

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.036 (89.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.037 · newest: 0.036 · change: -0.001

Affected products

Rubygems
Debian Linux — versions 7.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

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)
access.redhat.com/errata/RHSA-2018:3730 (vendor-advisory)
lists.debian.org/debian-lts-announce/2018/04/msg00023.html (mailing-list)
access.redhat.com/errata/RHSA-2018:3731 (vendor-advisory)
lists.debian.org/debian-lts-announce/2018/04/msg00001.html (mailing-list, Third Party 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/feadefc2d351dcb95d6492f5ad17ebca546eb964 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-1000077?: CVE-2018-1000077 is a medium-severity vulnerability in Rubygems, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2018-03-13.
How severe is CVE-2018-1000077?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2018-1000077 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.