Is CVE-2008-1891 in the CISA KEV catalog?

No. CVE-2008-1891 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2008-1891?

CVE-2008-1891 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2008-1891?

CVE-2008-1891 has an EPSS score of 2.81% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2008-1891?

Upgrade ruby4 on rhel 8 to 0-main@aarch64 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2008-1891

MEDIUMEPSS 85th pctl

5.0

CVSS v2

NVD

Description

Directory traversal vulnerability in WEBrick in Ruby 1.8.4 and earlier, 1.8.5 before 1.8.5-p231, 1.8.6 before 1.8.6-p230, 1.8.7 before 1.8.7-p22, and 1.9.0 before 1.9.0-2, when using NTFS or FAT filesystems, allows remote attackers to read arbitrary CGI files via a trailing (1) + (plus), (2) %2b (encoded plus), (3) . (dot), (4) %2e (encoded dot), or (5) %20 (encoded space) character in the URI, possibly related to the WEBrick::HTTPServlet::FileHandler and WEBrick::HTTPServer.new functionality and the :DocumentRoot option.

CWE-22Path Traversal

How to fix

Remediation Available

ruby4Red Hat / RHEL

Fixed in:0-main@aarch64RHSA-2026:8838

Fixed in:0-main@srcRHSA-2026:8838

Fixed in:0-main@x86_64RHSA-2026:8838

Fixed in:0-main@noarchRHSA-2026:8838

ruby4Rocky

Fixed in:0-main@aarch64RHSA-2026:8838

Fixed in:0-main@srcRHSA-2026:8838

Fixed in:0-main@x86_64RHSA-2026:8838

Fixed in:0-main@noarchRHSA-2026:8838

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

2.81%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Vendor Advisory1

secunia.com

Other references10

Related Vulnerabilities

Other CWE-22 (Path Traversal) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-23897	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-32315	High	8.6	100%	KEV	Fix
CVE-2022-29464	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-26086	Medium	5.3	100%	KEV	Fix
CVE-2021-22005	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-5902	Critical	9.8	100%	KEV + Ransom	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.