CVE-2021-3518
Nokogiri Implements libxml2 version vulnerable to use-after-free
Summary
Remediation
Upgrade to the fixed version using your package manager.
gem install nokogiri -v 1.11.4
After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.
Affected Packages (1)
| Package | Ecosystem | Affected | Fixed In |
|---|---|---|---|
| nokogiri | rubygems | 1.0.0, 1.0.1, 1.0.2, 1.0.3 (+124 more) | 1.11.4 |
Vulnerability Classification
Common Weakness Enumeration (CWE) identifiers for this vulnerability type.
- CWE-416Use After FreeMITRE
CVSS Score Breakdown
What the CVSS (Common Vulnerability Scoring System) 8.8 score means for each attack dimension.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-3518ADVISORY
- https://www.oracle.com/security-alerts/cpuoct2021.htmlWEB
- https://www.oracle.com/security-alerts/cpujul2022.htmlWEB
- https://www.oracle.com/security-alerts/cpuapr2022.htmlWEB
- https://support.apple.com/kb/HT212605WEB
- https://support.apple.com/kb/HT212604WEB
- https://support.apple.com/kb/HT212602WEB
- https://support.apple.com/kb/HT212601WEB
- https://security.netapp.com/advisory/ntap-20210625-0002WEB
- https://security.gentoo.org/glsa/202107-05WEB
- https://nokogiri.org/CHANGELOG.html#1114-2021-05-14WEB
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QVM4UJ3376I6ZVOYMHBNX4GY3NIV52WVWEB
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6WEB
- https://lists.debian.org/debian-lts-announce/2021/05/msg00008.htmlWEB
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4@%3Cissues.bookkeeper.apache.org%3EWEB
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b@%3Cissues.bookkeeper.apache.org%3EWEB
- https://github.com/sparklemotion/nokogiri/blob/2edbbef95f1dc12c1ddc5ebda71b9159026245fe/CHANGELOG.md?plain=1#L722WEB
- https://github.com/sparklemotion/nokogiriPACKAGE
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/CVE-2021-3518.ymlWEB
- https://bugzilla.redhat.com/show_bug.cgi?id=1954242WEB
- https://seclists.org/fulldisclosure/2021/Jul/54WEB
- https://seclists.org/fulldisclosure/2021/Jul/55WEB
- https://seclists.org/fulldisclosure/2021/Jul/58WEB
- https://seclists.org/fulldisclosure/2021/Jul/59WEB
Frequently Asked Questions
- What is CVE-2021-3518?
- Nokogiri Implements libxml2 version vulnerable to use-after-free This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.8/10).
- How do I check if my project is affected by CVE-2021-3518?
- CVE-2021-3518 affects nokogiri. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2021-3518 and 200,000+ other known vulnerabilities.
Severity & Exploitability
High exploitability or significant impact. Prioritize remediation within days.
Also Known As
Related CVEs
- CVE-2021-41098HIGH
Improper Restriction of XML External Entity Reference (XXE) in Nokogiri on JRuby
- CVE-2021-30560HIGH
Nokogiri has vulnerable dependencies on libxml2 and libxslt
- CVE-2012-6685HIGH
Nokogiri is vulnerable to XML External Entity (XXE) attack
- CVE-2020-7595HIGH
libxml as used in Nokogiri has an infinite loop in a certain end-of-file situation
- CVE-2021-3537MEDIUM
Nokogiri Implements libxml2 version vulnerable to null pointer dereferencing
- CVE-2026-57235MEDIUM
Nokogiri: Possible Out-of-Bounds Read in `Nokogiri::XML::NodeSet#[]`
- CVE-2013-6460MEDIUM
Nokogiri vulnerable to DoS while parsing XML documents
- CVE-2026-57236LOW
Nokogiri: Possible Use-After-Free when `Nokogiri::XML::Document#encoding=` raises an exception
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