Vulnerability Details : CVE-2021-41098
Nokogiri is a Rubygem providing HTML, XML, SAX, and Reader parsers with XPath and CSS selector support. In Nokogiri v1.12.4 and earlier, on JRuby only, the SAX parser resolves external entities by default. Users of Nokogiri on JRuby who parse untrusted documents using any of these classes are affected: Nokogiri::XML::SAX::Parse, Nokogiri::HTML4::SAX::Parser or its alias Nokogiri::HTML::SAX::Parser, Nokogiri::XML::SAX::PushParser, and Nokogiri::HTML4::SAX::PushParser or its alias Nokogiri::HTML::SAX::PushParser. JRuby users should upgrade to Nokogiri v1.12.5 or later to receive a patch for this issue. There are no workarounds available for v1.12.4 or earlier. CRuby users are not affected.
Vulnerability category: XML external entity (XXE) injection
Products affected by CVE-2021-41098
- cpe:2.3:a:nokogiri:nokogiri:*:*:*:*:*:ruby:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-41098
0.13%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 47 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-41098
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:P/I:N/A:N |
10.0
|
2.9
|
NIST | |
7.5
|
HIGH | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
3.9
|
3.6
|
GitHub, Inc. | |
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2021-41098
-
The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.Assigned by: security-advisories@github.com (Primary)
References for CVE-2021-41098
-
https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-2rr5-8q37-2w7h
Improper Restriction of XML External Entity Reference (XXE) in Nokogiri on JRuby · Advisory · sparklemotion/nokogiri · GitHubThird Party Advisory
-
https://github.com/sparklemotion/nokogiri/commit/5bf729ff3cc84709ee3c3248c981584088bf9f6d
Merge pull request #2328 from sparklemotion/flavorjones-GHSA-2rr5-8q3… · sparklemotion/nokogiri@5bf729f · GitHubPatch;Third Party Advisory
Jump to