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CVE-2026-126062

Nokogiri : Possible SSRF on JRuby when resolving external DTDs or entities with `NONET` set

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.5, on JRuby, applications that parse untrusted XML with DTDLOAD, DTDVALID, or NOENT can have the NONET restriction bypassed when an external DTD or entity uses a short-form IPv4 host or uses absolute paths resolved against a network URL. The resolver can treat these identifiers as local and send a network request, potentially enabling server-side request forgery. CRuby and default parse options are not affected. This issue is fixed in version 1.19.5.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Sparklemotion
Products
Nokogiri
CVE-2026-126063

Nokogiri: Mutation XSS through `noscript` content in Nokogiri's HTML5 serializer

Nokogiri is an open source XML and HTML library for the Ruby programming language. From 1.12.0 until 1.19.5, the C extension on CRuby and TruffleRuby has a Nokogiri::HTML5 serializer that does not escape text inside noscript elements or angle brackets inside attribute values. When an application sanitizes untrusted HTML with the default parsing options, allows noscript, and sends serialized output to a scripting-enabled browser, the browser can parse markup that Nokogiri did not produce, enabling mutation cross-site scripting. Using parse_noscript_content_as_text: true is the recommended workaround, not the vulnerable default. JRuby is not affected because it does not implement Nokogiri::HTML5. This issue is fixed in version 1.19.5.

CVSS 4.0 · 2.3 Low EPSS < 1% KEV · Not listed
Vendors
Sparklemotion
Products
Nokogiri
CVE-2026-126064

Nokogiri: Possible Use-After-Free when setting an attribute value via `Nokogiri::XML::Node#[]=` or `#lang=`

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.5, the CRuby native extension can leave Ruby wrappers pointing to freed memory when Nokogiri::XML::Node#[]= or Nokogiri::XML::Node#lang= replaces an existing attribute value after code has accessed the attribute's child nodes. Replacing the value frees native child nodes while their wrappers remain reachable, and later use of those wrappers can cause an invalid read or process segfault. JRuby is not affected. This issue is fixed in version 1.19.5.

CVSS 4.0 · 2 Low EPSS < 1% KEV · Not listed
Vendors
Sparklemotion
Products
Nokogiri
CVE-2025-71346

nokogiri: libxml2: Nokogiri: Heap buffer under-read in XML Schema validation

This CVE ID has been rejected as a duplicate.

CVSS 3.1 · 2.9 Low EPSS n/a KEV · Not listed
Vendors
Sparklemotion
Products
Nokogiri
CVE-2026-79771

Nokogiri before 1.19.3 Memory Leak via XSLT Transform

Nokogiri versions before 1.19.3 contain a memory leak in the XSLT Stylesheet transform method when processing Ruby strings containing null bytes. Attackers can exploit this by passing attacker-controlled input with null bytes to transform parameters, causing heap allocations to leak and enabling denial of service against long-running processes.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Nokogiri Sparklemotion
Products
Nokogiri Nokogiri
CVE-2026-79772

Nokogiri before 1.19.1 Unchecked Return Value canonicalize

Nokogiri versions before 1.19.1 fail to check the return value from xmlC14NExecute in the canonicalize method, returning an empty string on failure instead of raising an exception. Attackers can exploit this to bypass signature validation in downstream SAML libraries by providing invalid canonicalized XML that is incorrectly accepted as valid.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Nokogiri Sparklemotion
Products
Nokogiri Nokogiri
CVE-2026-57236

Nokogiri: Possible Use-After-Free when `Nokogiri::XML::Document#encoding=` raises an exception

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, calling Document#encoding= with an invalid encoding (e.g., a non-string, or a string containing a null byte) raises an exception, but only after freeing the document's current encoding string without replacing it. The document is left referencing freed memory, so the next call to Document#encoding reads invalid memory, which can cause a segfault or leak freed bytes into a Ruby String. Affects the CRuby (libxml2) implementation only; JRuby is not affected. This vulnerability is fixed in 1.19.4.

CVSS 4.0 · 1.7 Low EPSS < 1% KEV · Not listed
Vendors
Nokogiri Sparklemotion
Products
Nokogiri Nokogiri
CVE-2026-57234

Nokogiri: XML::Schema on JRuby allows network requests when NONET is set, bypassing CVE-2020-26247

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, the NONET parse option, which Nokogiri turns on by default for Nokogiri::XML::Schema (see CVE-2020-26247), was not correctly enforced on the JRuby implementation. As a result, a schema parsed with default options could still cause external resources to be fetched over the network, potentially enabling SSRF or XXE attacks. This vulnerability is fixed in 1.19.4.

CVSS 3.1 · 2.6 Low EPSS < 1% KEV · Not listed
Vendors
Nokogiri Sparklemotion
Products
Nokogiri Nokogiri
CVE-2026-57235

Nokogiri: Possible Out-of-Bounds Read in `Nokogiri::XML::NodeSet#[]`

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri::XML::NodeSet#[] (and its alias #slice) checked the requested index against the node set's bounds using a 32-bit-truncated copy of the index. A large negative index could pass the check and then be used at full width, reading outside the node set's storage. On CRuby this is an out-of-bounds read that typically crashes the process; on JRuby it is not memory-unsafe but returns an incorrect node. This vulnerability is fixed in 1.19.4.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Nokogiri Sparklemotion
Products
Nokogiri Nokogiri
CVE-2026-57434

Nokogiri: Null Pointer Dereference calling methods on uninitialized wrapper classes

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri contains a bug when calling certain methods on allocated-but-uninitialized native wrapper classes that inherit from Nokogiri::XML::Node. This caused a NULL pointer dereference that could crash the process. This vulnerability is fixed in 1.19.4.

CVSS 4.0 · 1.7 Low EPSS < 1% KEV · Not listed
Vendors
Nokogiri Sparklemotion
Products
Nokogiri Nokogiri
CVE-2026-57435

Nokogiri: Possible Use-After-Free when setting an attribute value via `Nokogiri::XML::Attr#value=` or `#content=`

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri’s CRuby native extension could leave a Ruby wrapper pointing to freed memory when replacing the value of an XML attribute. If Ruby code had already accessed an attribute child node, Nokogiri::XML::Attr#value= could free the underlying native child node while the wrapper remained reachable through the document node cache. A later use of the freed child node or a Ruby GC mark could dereference an invalid pointer, causing an invalid read and a possible segfault. This vulnerability is fixed in 1.19.4.

CVSS 4.0 · 1.7 Low EPSS < 1% KEV · Not listed
Vendors
Nokogiri Sparklemotion
Products
Nokogiri Nokogiri
CVE-2026-57436

Nokogiri: Possible Use-After-Free when setting `Document#root=` to an invalid node type

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri::XML::Document#root= validated only that the new root was a Nokogiri::XML::Node, allowing a DTD node to be set as the document root. The result is a heap use-after-free during garbage collection or finalization, leading to an invalid memory read or potentially a segfault. This vulnerability is fixed in 1.19.4.

CVSS 4.0 · 1.7 Low EPSS < 1% KEV · Not listed
Vendors
Nokogiri Sparklemotion
Products
Nokogiri Nokogiri
CVE-2026-57437

Nokogiri: Possible Use-After-Free when directly using `NokogirI::XML::XPathContext` beyond document lifetime

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri::XML::XPathContext did not keep its source document alive for garbage collection. If an XPathContext outlived its document and the document was collected, evaluating an XPath expression could read invalid memory and potentially segfault. This is only reachable when application code constructs an XPathContext directly and lets the document become unreachable while continuing to use the context. The normal Document#xpath, #css, and related search methods are not affected, and it is not triggerable by malicious document input. This vulnerability is fixed in 1.19.4.

CVSS 4.0 · 1.7 Low EPSS < 1% KEV · Not listed
Vendors
Nokogiri Sparklemotion
Products
Nokogiri Nokogiri
CVE-2026-57438

Nokogiri: Possible Use-After-Free in XInclude Processing

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, XInclude substitution performed by Nokogiri::XML::Node#do_xinclude replaced each <xi:include> in place, freeing the include node along with its children (such as <xi:fallback> and its descendants) and any namespaces declared on them. If an application had already exposed one of those nodes or namespaces to Ruby, the corresponding Ruby object was left pointing at freed memory. Using the object could result in invalid reads or writes to memory. This vulnerability is fixed in 1.19.4.

CVSS 4.0 · 2.2 Low EPSS < 1% KEV · Not listed
Vendors
Nokogiri Sparklemotion
Products
Nokogiri Nokogiri