No exploitation reportedFix available

CVE-2018-8779

Q: Is CVE-2018-8779 actively exploited?

Active exploitation of CVE-2018-8779 has not been confirmed. Its EPSS score was 6.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2018-8779?

CVE-2018-8779 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

No exploitation reported by the sources we read.

Published2018-04-03
Fixed in2.5.1 · 2.4.4 · 2.3.7 · 2.2.10
WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In Ruby before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1, the UNIXServer.open and UNIXSocket.open methods are not checked for null characters. It may be connected to an unintended socket.

Timeline

dates in UTC

2018-04-0322:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-8779?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-8779?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Ruby

Branch	Affected	Fixed in	Source
2.5	≥ 2.5.0, < 2.5.1	2.5.1	NVD
2.4	≥ 2.4.0, < 2.4.4	2.4.4	NVD
2.3	≥ 2.3.0, < 2.3.7	2.3.7	NVD
2.2	≥ 2.2.0, < 2.2.10	2.2.10	NVD
2.6	= 2.6.0	no fix published	NVD

Canonical ubuntu linux

Branch	Affected	Fixed in	Source
14.4	= 14.04	no fix published	NVD
16.4	= 16.04	no fix published	NVD
17.10	= 17.10	no fix published	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
7.0	= 7.0	no fix published	NVD
8.0	= 8.0	no fix published	NVD
9.0	= 9.0	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Ruby to 2.5.1 · 2.4.4 · 2.3.7 · 2.2.10

Advisories and patches

www.ruby-lang.orgVendor Advisory
www.ruby-lang.orgPatch · Vendor Advisory
www.ruby-lang.orgPatch · Vendor Advisory
www.ruby-lang.orgPatch · Vendor Advisory
www.ruby-lang.orgPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-20read 2026-10-23
FIRST EPSSEPSS score6.9 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published: 2018-04-03
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2018-8779?

Is CVE-2018-8779 actively exploited?

Active exploitation of CVE-2018-8779 has not been confirmed. Its EPSS score was 6.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-8779?

CVE-2018-8779 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

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