Package Instance

Nokogiri update packaged libxml2 to v2.12.5 to resolve CVE-2024-25062
## Summary

Nokogiri upgrades its dependency libxml2 as follows:
- Nokogiri v1.15.6 upgrades libxml2 to [2.11.7](https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.11.7) from 2.11.6
- Nokogiri v1.16.2 upgrades libxml2 to [2.12.5](https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.12.5) from 2.12.4

libxml2 v2.11.7 and v2.12.5 address the following vulnerability:

- CVE-2024-25062 / https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-25062
  - described at https://gitlab.gnome.org/GNOME/libxml2/-/issues/604
  - patched by https://gitlab.gnome.org/GNOME/libxml2/-/commit/92721970

Please note that this advisory only applies to the CRuby implementation of Nokogiri, and only if the _packaged_ libraries are being used. If you've overridden defaults at installation time to use _system_ libraries instead of packaged libraries, you should instead pay attention to your distro's `libxml2` release announcements.

JRuby users are not affected.

## Mitigation

Upgrade to Nokogiri `~> 1.15.6` or `>= 1.16.2`.

Users who are unable to upgrade Nokogiri may also choose a more complicated mitigation: compile
and link Nokogiri against patched external libxml2 libraries which will also address these same
issues.

## Impact

From the CVE description, this issue applies to the `xmlTextReader` module (which underlies `Nokogiri::XML::Reader`):

> When using the XML Reader interface with DTD validation and XInclude expansion enabled, processing crafted XML documents can lead to an xmlValidatePopElement use-after-free.

## Timeline

- 2024-02-04 10:35 EST - this GHSA is drafted without complete details about when the upstream issue was introduced; a request is made of libxml2 maintainers for more detailed information
- 2024-02-04 10:48 EST - updated GHSA to reflect libxml2 maintainers' confirmation of affected versions
- 2024-02-04 11:54 EST - v1.16.2 published, this GHSA made public
- 2024-02-05 10:18 EST - updated with MITRE link to the CVE information, and updated "Impact" section
- 2024-03-16 09:03 EDT - v1.15.6 published (see discussion at https://github.com/sparklemotion/nokogiri/discussions/3146), updated mitigation information
- 2024-03-18 22:12 EDT - update "affected products" range with v1.15.6 information

Nokogiri patches vendored libxml2 to resolve multiple CVEs
## Summary

Nokogiri v1.18.9 patches the vendored libxml2 to address CVE-2025-6021, CVE-2025-6170, CVE-2025-49794, CVE-2025-49795, and CVE-2025-49796.

## Impact and severity

### CVE-2025-6021

A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input.

NVD claims a severity of 7.5 High (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/17d950ae

### CVE-2025-6170

A flaw was found in the interactive shell of the xmllint command-line tool, used for parsing XML files. When a user inputs an overly long command, the program does not check the input size properly, which can cause it to crash. This issue might allow attackers to run harmful code in rare configurations without modern protections.

NVD claims a severity of 2.5 Low (CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L)

Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/5e9ec5c1

### CVE-2025-49794

A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under certain circumstances when the XML schematron has the <sch:name path="..."/> schema elements. This flaw allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the program's crash using libxml or other possible undefined behaviors.

NVD claims a severity of 9.1 Critical (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H)

Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/81cef8c5

### CVE-2025-49795

A NULL pointer dereference vulnerability was found in libxml2 when processing XPath XML expressions. This flaw allows an attacker to craft a malicious XML input to libxml2, leading to a denial of service.

NVD claims a severity of 7.5 High (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/62048278

### CVE-2025-49796

A vulnerability was found in libxml2. Processing certain sch:name elements from the input XML file can trigger a memory corruption issue. This flaw allows an attacker to craft a malicious XML input file that can lead libxml to crash, resulting in a denial of service or other possible undefined behavior due to sensitive data being corrupted in memory.

NVD claims a severity of 9.1 Critical (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H)

Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/81cef8c5

## Affected Versions

- Nokogiri < 1.18.9 when using CRuby (MRI) with vendored libxml2

## Patched Versions

- Nokogiri >= 1.18.9

## Mitigation

Upgrade to Nokogiri v1.18.9 or later.

Users who are unable to upgrade Nokogiri may also choose a more complicated mitigation: compile and link Nokogiri against patched external libxml2 libraries which will also address these same issues.

## References

- https://github.com/sparklemotion/nokogiri/pull/3526
- https://nvd.nist.gov/vuln/detail/CVE-2025-6021
- https://nvd.nist.gov/vuln/detail/CVE-2025-6170
- https://nvd.nist.gov/vuln/detail/CVE-2025-49794
- https://nvd.nist.gov/vuln/detail/CVE-2025-49795
- https://nvd.nist.gov/vuln/detail/CVE-2025-49796

Duplicate Advisory: Nokogiri updates packaged libxml2 to v2.12.7 to resolve CVE-2024-34459
## Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-r95h-9x8f-r3f7. This link is maintained to preserve external references.

## Original Description

## Summary

Nokogiri v1.16.5 upgrades its dependency libxml2 to
[2.12.7](https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.12.7) from 2.12.6.

libxml2 v2.12.7 addresses CVE-2024-34459:

- described at https://gitlab.gnome.org/GNOME/libxml2/-/issues/720
- patched by https://gitlab.gnome.org/GNOME/libxml2/-/commit/2876ac53

## Impact

There is no impact to Nokogiri users because the issue is present only
in libxml2's `xmllint` tool which Nokogiri does not provide or expose.

## Timeline

- 2024-05-13 05:57 EDT, libxml2 2.12.7 release is announced
- 2024-05-13 08:30 EDT, nokogiri maintainers begin triage
- 2024-05-13 10:05 EDT, nokogiri [v1.16.5 is released](https://github.com/sparklemotion/nokogiri/releases/tag/v1.16.5)
  and this GHSA made public

Nokogiri updates packaged libxml2 to v2.12.7 to resolve CVE-2024-34459
## Summary

Nokogiri v1.16.5 upgrades its dependency libxml2 to [2.12.7](https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.12.7) from 2.12.6.

libxml2 v2.12.7 addresses CVE-2024-34459:

- described at https://gitlab.gnome.org/GNOME/libxml2/-/issues/720
- patched by https://gitlab.gnome.org/GNOME/libxml2/-/commit/2876ac53


## Impact

There is no impact to Nokogiri users because the issue is present only in libxml2's `xmllint` tool which Nokogiri does not provide or expose.


## Timeline

- 2024-05-13 05:57 EDT, libxml2 2.12.7 release is announced
- 2024-05-13 08:30 EDT, nokogiri maintainers begin triage
- 2024-05-13 10:05 EDT, nokogiri [v1.16.5 is released](https://github.com/sparklemotion/nokogiri/releases/tag/v1.16.5) and this GHSA made public

Duplicate Advisory: Use-after-free in libxml2 via Nokogiri::XML::Reader
# Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-xc9x-jj77-9p9j. This link is maintained to preserve external references.

# Original Description

### Summary

Nokogiri upgrades its dependency libxml2 as follows:
- v1.15.6 upgrades libxml2 to 2.11.7 from 2.11.6
- v1.16.2 upgrades libxml2 to 2.12.5 from 2.12.4

libxml2 v2.11.7 and v2.12.5 address the following vulnerability:

CVE-2024-25062 / https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-25062
- described at https://gitlab.gnome.org/GNOME/libxml2/-/issues/604
- patched by https://gitlab.gnome.org/GNOME/libxml2/-/commit/92721970

Please note that this advisory only applies to the CRuby implementation of Nokogiri, and only if
the packaged libraries are being used. If you've overridden defaults at installation time to use
system libraries instead of packaged libraries, you should instead pay attention to your distro's
libxml2 release announcements.

JRuby users are not affected.

### Severity

The Nokogiri maintainers have evaluated this as **Moderate**.

### Impact

From the CVE description, this issue applies to the `xmlTextReader` module (which underlies
`Nokogiri::XML::Reader`):

> When using the XML Reader interface with DTD validation and XInclude expansion enabled,
> processing crafted XML documents can lead to an xmlValidatePopElement use-after-free.

### Mitigation

Upgrade to Nokogiri `~> 1.15.6` or `>= 1.16.2`.

Users who are unable to upgrade Nokogiri may also choose a more complicated mitigation: compile
and link Nokogiri against patched external libxml2 libraries which will also address these same
issues.

Nokogiri does not check the return value from xmlC14NExecute
## Summary

Nokogiri's CRuby extension fails to check the return value from `xmlC14NExecute` in the method `Nokogiri::XML::Document#canonicalize` and `Nokogiri::XML::Node#canonicalize`. When canonicalization fails, an empty string is returned instead of raising an exception. This incorrect return value may allow downstream libraries to accept invalid or incomplete canonicalized XML, which has been demonstrated to enable signature validation bypass in SAML libraries.

JRuby is not affected, as the Java implementation correctly raises `RuntimeError` on canonicalization failure.

## Mitigation

Upgrade to Nokogiri `>= 1.19.1`.

## Severity

The maintainers have assessed this as **Medium** severity. Nokogiri itself is a parsing library without a clear security boundary related to canonicalization, so the direct impact is that a method returns incorrect data on invalid input. However, this behavior was exploited in practice to bypass SAML signature validation in downstream libraries (see References).

## Credit

This vulnerability was responsibly reported by HackerOne researcher `d4d`.

Duplicate Advisory: Nokogiri updates packaged libxml2 to 2.13.6 to resolve CVE-2025-24928 and CVE-2024-56171
# Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-vvfq-8hwr-qm4m. This link is maintained to preserve external references.

# Original Description

## Summary

Nokogiri v1.18.3 upgrades its dependency libxml2 to
[v2.13.6](https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.13.6).

libxml2 v2.13.6 addresses:

- CVE-2025-24928
  - described at https://gitlab.gnome.org/GNOME/libxml2/-/issues/847
- CVE-2024-56171
   - described at https://gitlab.gnome.org/GNOME/libxml2/-/issues/828

## Impact

### CVE-2025-24928

Stack-buffer overflow is possible when reporting DTD validation
errors if the input contains a long (~3kb) QName prefix.

### CVE-2024-56171

Use-after-free is possible during validation against untrusted
XML Schemas (.xsd) and, potentially, validation of untrusted documents
against trusted Schemas if they make use of `xsd:keyref` in combination
with recursively defined types that have additional identity constraints.

Nokogiri updates packaged libxslt to v1.1.43 to resolve multiple CVEs
## Summary

Nokogiri v1.18.4 upgrades its dependency libxslt to [v1.1.43](https://gitlab.gnome.org/GNOME/libxslt/-/releases/v1.1.43).

libxslt v1.1.43 resolves:

- CVE-2025-24855: Fix use-after-free of XPath context node
- CVE-2024-55549: Fix UAF related to excluded namespaces

## Impact

### CVE-2025-24855

- "Use-after-free due to xsltEvalXPathStringNs leaking xpathCtxt->node"
- MITRE has rated this 7.8 High CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:H
- Upstream report: https://gitlab.gnome.org/GNOME/libxslt/-/issues/128
- NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2025-24855

### CVE-2024-55549

- "Use-after-free related to excluded result prefixes"
- MITRE has rated this 7.8 High CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:H
- Upstream report: https://gitlab.gnome.org/GNOME/libxslt/-/issues/127
- NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2024-55549

Nokogiri updates packaged libxml2 to v2.13.8 to resolve CVE-2025-32414 and CVE-2025-32415
## Summary

Nokogiri v1.18.8 upgrades its dependency libxml2 to [v2.13.8](https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.13.8).

libxml2 v2.13.8 addresses:

- CVE-2025-32414
  - described at https://gitlab.gnome.org/GNOME/libxml2/-/issues/889
- CVE-2025-32415
  - described at https://gitlab.gnome.org/GNOME/libxml2/-/issues/890

## Impact

### CVE-2025-32414: No impact

In libxml2 before 2.13.8 and 2.14.x before 2.14.2, out-of-bounds memory access can occur in the Python API (Python bindings) because of an incorrect return value. This occurs in xmlPythonFileRead and xmlPythonFileReadRaw because of a difference between bytes and characters.

**There is no impact** from this CVE for Nokogiri users.


### CVE-2025-32415: Low impact

In libxml2 before 2.13.8 and 2.14.x before 2.14.2, xmlSchemaIDCFillNodeTables in xmlschemas.c has a heap-based buffer under-read. To exploit this, a crafted XML document must be validated against an XML schema with certain identity constraints, or a crafted XML schema must be used.

In the upstream issue, further context is provided by the maintainer:

> The bug affects validation against untrusted XML Schemas (.xsd) and validation of untrusted
> documents against trusted Schemas if they make use of xsd:keyref in combination with recursively
> defined types that have additional identity constraints.

MITRE has published a severity score of 2.9 LOW (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L) for this CVE.

Nokogiri updates packaged libxml2 to v2.10.4 to resolve multiple CVEs
### Summary

Nokogiri v1.14.3 upgrades the packaged version of its dependency libxml2 to [v2.10.4](https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.10.4) from v2.10.3.

libxml2 v2.10.4 addresses the following known vulnerabilities:

- [CVE-2023-29469](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-29469): Hashing of empty dict strings isn't deterministic
- [CVE-2023-28484](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-28484): Fix null deref in xmlSchemaFixupComplexType
- Schemas: Fix null-pointer-deref in xmlSchemaCheckCOSSTDerivedOK

Please note that this advisory only applies to the CRuby implementation of Nokogiri `< 1.14.3`, and only if the _packaged_ libraries are being used. If you've overridden defaults at installation time to use _system_ libraries instead of packaged libraries, you should instead pay attention to your distro's `libxml2` release announcements.


### Mitigation

Upgrade to Nokogiri `>= 1.14.3`.

Users who are unable to upgrade Nokogiri may also choose a more complicated mitigation: compile and link Nokogiri against external libraries libxml2 `>= 2.10.4` which will also address these same issues.


### Impact

No public information has yet been published about the security-related issues other than the upstream commits. Examination of those changesets indicate that the more serious issues relate to libxml2 dereferencing NULL pointers and potentially segfaulting while parsing untrusted inputs.

The commits can be examined at:

- [[CVE-2023-29469] Hashing of empty dict strings isn't deterministic (09a2dd45) · Commits · GNOME / libxml2 · GitLab](https://gitlab.gnome.org/GNOME/libxml2/-/commit/09a2dd453007f9c7205274623acdd73747c22d64)
- [[CVE-2023-28484] Fix null deref in xmlSchemaFixupComplexType (647e072e) · Commits · GNOME / libxml2 · GitLab](https://gitlab.gnome.org/GNOME/libxml2/-/commit/647e072ea0a2f12687fa05c172f4c4713fdb0c4f)
- [schemas: Fix null-pointer-deref in xmlSchemaCheckCOSSTDerivedOK (4c6922f7) · Commits · GNOME / libxml2 · GitLab](https://gitlab.gnome.org/GNOME/libxml2/-/commit/4c6922f763ad958c48ff66f82823ae21f2e92ee6)

Nokogiri updates packaged libxml2 to 2.13.6 to resolve CVE-2025-24928 and CVE-2024-56171
## Summary

Nokogiri v1.18.3 upgrades its dependency libxml2 to [v2.13.6](https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.13.6).

libxml2 v2.13.6 addresses:

- CVE-2025-24928
  - described at https://gitlab.gnome.org/GNOME/libxml2/-/issues/847
- CVE-2024-56171
   - described at https://gitlab.gnome.org/GNOME/libxml2/-/issues/828

## Impact

### CVE-2025-24928

Stack-buffer overflow is possible when reporting DTD validation errors if the input contains a long (~3kb) QName prefix.

### CVE-2024-56171

Use-after-free is possible during validation against untrusted XML Schemas (.xsd) and, potentially, validation of untrusted documents against trusted Schemas if they make use of `xsd:keyref` in combination with recursively defined types that have additional identity constraints.