High [CVE-2022-50998] Denial of Service and Memory Corruption via Crafted XML Input
This high-severity Red Hat Linux advisory covers CVE-2022-50998.
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Summary
Nokogiri before 1.13.9 (CRuby implementation using packaged libraries) bundles libxml2 v2.9.14, which is affected by CVE-2022-40304 (data corruption / double-free from an entity reference cycle when entity content is allocated from a dict) and CVE-2022-40303 (integer overflows when parsing with XML_PARSE_HUGE).
Nokogiri 1.13.9 upgrades the packaged libxml2 to v2.10.3 to address these issues.
Processing crafted XML input may lead to denial of service or memory corruption. (The advisory also references CVE-2022-2309, a NULL pointer dereference via iterwalk/canonicalize, which maintainers determined does not affect Nokogiri users.) A flaw was found in Nokogiri, a Ruby gem for parsing XML and HTML documents.
This vulnerability arises from issues within its bundled libxml2 library, specifically involving data corruption from entity reference cycles and integer overflows when processing large XML files.
A remote attacker could exploit these flaws by providing specially crafted XML input, potentially leading to denial of service or memory corruption within the application. Red Hat products utilizing `rubygem-nokogiri` are affected, making systems susceptible if they handle untrusted XML data.
The flaw stems from underlying issues in `libxml2` bundled with Nokogiri, which could be triggered without complex attack vectors.
- < 1.13.9
- < 9.14
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation checklist
- To mitigate this Important vulnerability, applications processing untrusted XML input via Nokogiri should implement strict input validation and sanitization. Restrict the sources of XML input to trusted origins only. Where possible, isolate or sandbox applications that process external XML to limit the potential blast radius of a successful exploitation.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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