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Fencer Vulns
high 7.5

CVE-2017-17042 json

Arbitrary file read vulnerability in yard server

published 2017-11-28 8 y ago modified 2026-06-17 4 mo ago also GHSA-gj4p-3wh3-2rmf , EUVD-2017-0362

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.9%
EPSS 2.9% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

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.

Patch / fix

  • rubygems yard 0.9.11
  • yardoc yard 0.9.11
  • yard Debian 14, Debian 13, Debian 12 0.9.12-1

debian advisories DEBIAN-CVE-2017-17042

  • yard Ubuntu Pro 16.04 LTS 0.8.7.6+git20160220-3ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2017-17042

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • rubygem-yard SLE Software Development Kit 12 SP3 0.8.7.3-7.3.1

suse advisories SUSE-SU-2018:1890-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-17042 updated cvss 7.5

rubygem-yard: (lib/yard/core_ext/file.rb) is vulnerable to directory traversal attacks

  • Red Hat Enterprise MRG 2 rubygem-yard Red Hat Subscription Asset Manager rubygem-yard
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.89% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N
GitHub 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
rubygems yard
<0.9.11
0.9.11

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.