GHSA-mc6j-h948-v2p6 · Severity: critical · Ecosystem: rubygems — RubyGems Improper Verification of Cryptographic Signature vulnerability
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 Verification of Cryptographic Signature vulnerability in package.rb that can result in a mis-signed gem could be installed, as the tarball would contain multiple gem signatures.. This vulnerability appears to have been fixed in 2.7.6.
Conclusion & alert: CVE-2018-1000076 is rated Moderate Risk (63.8/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.86%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2025-11-21 | 2.29% | 0.86% | -1.43% |
| 2 | 2025-11-18 | 0.91% | 2.29% | +1.38% |
| 3 | 2025-07-13 | — | 0.91% | — |
Full EPSS history (18 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.8 | 3.0 | CRITICAL |
|
3.9 | 5.9 | [email protected] |
| 7.5 | 2.0 | HIGH |
|
10.0 | 6.4 | [email protected] |
GHSA-mc6j-h948-v2p6 · Severity: critical · Ecosystem: rubygems — RubyGems Improper Verification of Cryptographic Signature vulnerability
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2018-1000076 not yet assigned priority: Debian including 2 source packages (jruby, rubygems), 9 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 9. | https://security-tracker.debian.org/tracker/CVE-2018-1000076 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2018-1000076 |
suse
|
medium | CVE-2018-1000076 severity moderate: SUSE including 301 source package names (2.17-17.3:libruby2_5-2_5-2.5.5-4.3.1, 2.17-17.3:ruby2.5-2.5.5-4.3.1, …), 1042 product×package rows across 263 product lines (Container bci/ruby, Container suse/rmt-server, … (263 product lines)): Fixed 842, Known Affected 157, Known Not Affected 43. | https://www.suse.com/security/cve/CVE-2018-1000076/ |
ubuntu
|
low | CVE-2018-1000076 low priority: Ubuntu including 6 source packages (jruby, ruby1.9.1, ruby2.0, ruby2.1, ruby2.3, ruby2.5), 118 status rows across 20 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 88, not-affected 12, needs-triage 8, released 8, ignored 2. | https://ubuntu.com/security/CVE-2018-1000076 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| rubygems | rubygems | <= 2.2.9 | cpe:2.3:a:rubygems:rubygems:*:*:*:*:*:*:*:* |
| rubygems | rubygems | <= 2.3.6 | cpe:2.3:a:rubygems:rubygems:*:*:*:*:*:*:*:* |
| rubygems | rubygems | <= 2.4.3 | cpe:2.3:a:rubygems:rubygems:*:*:*:*:*:*:*:* |
| rubygems | rubygems | <= 2.5.0 | cpe:2.3:a:rubygems:rubygems:*:*:*:*:*:*:*:* |
| debian | debian_linux | 7.0 | cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* |