CVE-2026-79770

Nokogiri versions before 1.19.3 are vulnerable to ReDoS (Regular Expression Denial of Service) in the CSS selector tokenizer , specifically in string-literal and identifier tokenization. An attacker who can supply adversarial CSS selectors to methods such as Node#css, Node#at_css, or Searchable#s...

CVE-2026-79770 Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer

Nokogiri versions before 1.19.3 contain regular expression denial of service vulnerabilities in the CSS selector tokenizer affecting string-literal and identifier tokenization. Attackers can inject adversarial CSS selectors into methods like Nodecss, Nodeatcss, and Searchablesearch to cause...

CVE-2026-79769 Nokogiri before 1.19.4 Invalid Memory Read via initialize_copy_with_args

Nokogiri versions before 1.19.4 contain a possible invalid out-of-bounds memory read in the protected internal Nodeinitializecopywithargs helper behind Nodedup and clone, which unwrapped its source argument as an xmlNode without a type check. If application code calls this protected method with a...

EUVD-2026-65527

Nokogiri versions before 1.19.4 contain a possible invalid out-of-bounds memory read in the protected internal Nodeinitializecopywithargs helper behind Nodedup and clone, which unwrapped its source argument as an xmlNode without a type check. If application code calls this protected method with a...

CVE-2026-79769

Nokogiri (Ruby gem) versions before 1.19.4 contain an out-of-bounds memory read in the protected internal method Node#initialize_copy_with_args , which unwraps its source argument as an xmlNode without a type check. If application code calls this method with a non-Node argument (e.g., a Namespace...

CVE-2025-71407 Nokogiri before 1.18.3 Stack Buffer Overflow and Use-After-Free

Nokogiri before 1.18.3 contains a stack buffer overflow vulnerability in libxml2 when reporting DTD validation errors with long QName prefixes, and a use-after-free vulnerability during validation against untrusted XML Schemas. Attackers can trigger these vulnerabilities by providing malicious DT...

EUVD-2025-210774

Nokogiri before 1.18.3 contains a stack buffer overflow vulnerability in libxml2 when reporting DTD validation errors with long QName prefixes, and a use-after-free vulnerability during validation against untrusted XML Schemas. Attackers can trigger these vulnerabilities by providing malicious DT...

CVE-2025-71407

Nokogiri versions before 1.18.3 contain two vulnerabilities in its bundled libxml2 component: a stack buffer overflow triggered when reporting DTD validation errors with long QName prefixes, and a use-after-free during validation against untrusted XML Schemas. An attacker can exploit these by sup...

CVE-2023-54354 Nokogiri before 1.14.3 Null Pointer Dereference via libxml2

Nokogiri before 1.14.3 CRuby implementation only, when using the packaged libxml2 bundles libxml2 v2.10.3, which is vulnerable to NULL pointer dereferences in XML Schema processing xmlSchemaFixupComplexType, CVE-2023-28484, and xmlSchemaCheckCOSSTDerivedOK. An attacker who supplies a...

CVE-2023-54354

Nokogiri before 1.14.3 (CRuby implementation only, when using the packaged libxml2) bundles libxml2 v2.10.3 , which contains NULL pointer dereference vulnerabilities in XML Schema processing functions (xmlSchemaFixupComplexType and xmlSchemaCheckCOSSTDerivedOK ). An attacker supplying a crafted o...

EUVD-2023-60605

Nokogiri before 1.14.3 CRuby implementation only, when using the packaged libxml2 bundles libxml2 v2.10.3, which is vulnerable to NULL pointer dereferences in XML Schema processing xmlSchemaFixupComplexType, CVE-2023-28484, and xmlSchemaCheckCOSSTDerivedOK. An attacker who supplies a...

EUVD-2022-56025

Nokogiri before 1.13.2 CRuby, when using packaged libraries ships vendored libxml2 2.9.12 and libxslt 1.1.34, which are affected by two upstream CVEs. Via CVE-2021-30560 in libxslt, an application transforming XML with untrusted XSL stylesheets is vulnerable to a denial-of-service attack. Via...

CVE-2022-51000 Nokogiri before 1.13.2 Multiple Vulnerabilities via libxml2 libxslt

Nokogiri before 1.13.2 CRuby, when using packaged libraries ships vendored libxml2 2.9.12 and libxslt 1.1.34, which are affected by two upstream CVEs. Via CVE-2021-30560 in libxslt, an application transforming XML with untrusted XSL stylesheets is vulnerable to a denial-of-service attack. Via...

CVE-2022-51000

Nokogiri before 1.13.2 (CRuby, when using packaged libraries) ships vendored libxml2 2.9.12 and libxslt 1.1.34 , inheriting two upstream vulnerabilities. Via CVE-2021-30560 in libxslt, transforming XML with untrusted XSL stylesheets can trigger a denial of service . Via CVE-2022-23308 in libxml2,...

CVE-2022-50999 Nokogiri before 1.13.5 Integer Overflow via libxml2

Nokogiri versions before 1.13.5 contain an integer overflow vulnerability in packaged libxml2 buffer handling functions that allows attackers to cause out-of-bounds memory writes. Attackers can exploit this by crafting multi-gigabyte XML files to trigger buffer overflows resulting in information...

EUVD-2022-56024

Nokogiri versions before 1.13.5 contain an integer overflow vulnerability in packaged libxml2 buffer handling functions that allows attackers to cause out-of-bounds memory writes. Attackers can exploit this by crafting multi-gigabyte XML files to trigger buffer overflows resulting in information...

CVE-2022-50999

Nokogiri versions before 1.13.5 contain an integer overflow in the packaged libxml2 buffer handling functions. Attackers can exploit this by supplying multi-gigabyte XML files that trigger out-of-bounds memory writes, potentially leading to information disclosure , data modification , or denial o...

EUVD-2021-34866

Nokogiri before 1.11.4 CRuby implementation only, when the packaged/vendored libxml2 is used bundles libxml2 2.9.10, which is affected by multiple vulnerabilities addressed in libxml2 2.9.12, including a memory leak in xmlSchemaValidateStream CVE-2019-20388, a global buffer over-read in...

EUVD-2022-56023

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...

CVE-2021-47996

Nokogiri before 1.11.4 (CRuby implementation, when using the bundled/vendored libxml2) ships libxml2 2.9.10 , which carries multiple known flaws later fixed in libxml2 2.9.12. These include a memory leak in xmlSchemaValidateStream (CVE-2019-20388), a global buffer over-read in xmlEncodeEntitiesIn...