CVE-2017-17042

lib/yard/core_ext/file.rb in the server in YARD before 0.9.11 does not block relative paths with an initial ../ sequence, which allows attackers to conduct directory traversal attacks and read arbitrary files.

Published: 2017-11-28 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-17042 is rated Moderate Risk (62.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.89%). EPSS rose +2.48% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-17042

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 2026-06-15 0.41% 2.89% +2.48%
2 2026-04-05 0.31% 0.41% +0.10%
3 2025-10-14 — 0.31% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-17042

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2017-17042

GitHub Security Advisory for CVE-2017-17042

GHSA-gj4p-3wh3-2rmf · Severity: high · Ecosystem: rubygems — Arbitrary file read vulnerability in yard server

OS Trackers for CVE-2017-17042

vendor priority summary link
debian not yet assigned CVE-2017-17042 not yet assigned priority: Debian including 1 source packages (yard), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-17042
redhat medium — https://access.redhat.com/security/cve/CVE-2017-17042
suse medium CVE-2017-17042 severity moderate: SUSE including 20 source package names (ruby2.1-rubygem-yard-0.8.7.3-7.3.1, rubygem-yard, …), 34 product×package rows across 22 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 6, … (22 product lines)): Fixed 19, Known Not Affected 15. https://www.suse.com/security/cve/CVE-2017-17042/
ubuntu medium CVE-2017-17042 medium priority: Ubuntu including 1 source packages (yard), 18 status rows across 18 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, trusty, upstream, xenial, zesty): not-affected 13, ignored 2, released 2, DNE 1. https://ubuntu.com/security/CVE-2017-17042

Affected software / configurations for CVE-2017-17042

Vendor Product Version Raw CPE
yardoc yard < 0.9.11 cpe:2.3:a:yardoc:yard:*:*:*:*:*:*:*:*

References for CVE-2017-17042

cvelogic Threat Intelligence