https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-03T12:39:46.201520+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/bell-cve-2026-57436 BELL-CVE-2026-57436 2026-10-03T12:39:46.310248+00:00

Affected: Alpaquita:stream: ruby-nokogiri

 https://cve.radiocsirt.org/vuln/brew-mikutter-cve-2026-57436 BREW-mikutter-CVE-2026-57436 — Nokogiri: Possible Use-After-Free when setting `Document#root=` to an invalid node type 2026-10-03T12:39:46.310297+00:00

Affected: Homebrew: mikutter

### Summary

`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.

Nokogiri 1.19.4 restricts `Document#root=` to element nodes, raising `TypeError` for any other node type.

This memory-safety issue affects only the CRuby implementation (libxml2). The JRuby implementation was not affected; the same input validation was added there for behavioral parity.

### Severity

The Nokogiri maintainers have evaluated this as low severity. This is only triggered by a programming error. It requires application code to assign a non-element node such as a DTD as the document root via `Document#root=`. Nokogiri 1.19.4 now raises `TypeError` instead of allowing a use-after-free. It cannot be triggered by untrusted input or through normal use of the public API.

### Mitigation

Upgrade to Nokogiri 1.19.4 or later.

As a workaround, applications that cannot upgrade should avoid assigning a DTD (or any non-element node) via `Document#root=`.

### Credit

This issue was responsibly reported by Zheng Yu from depthfirst.com.

 https://cve.radiocsirt.org/vuln/euvd-2026-330419 EUVD-2026-330419 2026-10-03T12:39:46.310340+00:00 EUVD-2026-330419 https://cve.radiocsirt.org/vuln/fkie_cve-2026-57436 fkie_cve-2026-57436 2026-10-03T12:39:46.310354+00:00

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.

 https://cve.radiocsirt.org/vuln/ghsa-wjv4-x9w8-wm3h GHSA-wjv4-x9w8-wm3h — Nokogiri: Possible Use-After-Free when setting `Document#root=` to an invalid node type 2026-10-03T12:39:46.310379+00:00

Affected: RubyGems: nokogiri

### Summary

`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.

Nokogiri 1.19.4 restricts `Document#root=` to element nodes, raising `TypeError` for any other node type.

This memory-safety issue affects only the CRuby implementation (libxml2). The JRuby implementation was not affected; the same input validation was added there for behavioral parity.

### Severity

The Nokogiri maintainers have evaluated this as low severity. This is only triggered by a programming error. It requires application code to assign a non-element node such as a DTD as the document root via `Document#root=`. Nokogiri 1.19.4 now raises `TypeError` instead of allowing a use-after-free. It cannot be triggered by untrusted input or through normal use of the public API.

### Mitigation

Upgrade to Nokogiri 1.19.4 or later.

As a workaround, applications that cannot upgrade should avoid assigning a DTD (or any non-element node) via `Document#root=`.

### Credit

This issue was responsibly reported by Zheng Yu from depthfirst.com.

 https://cve.radiocsirt.org/vuln/msrc_cve-2026-57436 msrc_CVE-2026-57436 — Nokogiri: Possible Use-After-Free when setting `Document#root=` to an invalid node type 2026-10-03T12:39:46.310411+00:00 msrc_CVE-2026-57436 https://cve.radiocsirt.org/vuln/ubuntu-cve-2026-57436 UBUNTU-CVE-2026-57436 2026-10-03T12:39:46.310429+00:00

Affected: Ubuntu:Pro:14.04:LTS: ruby-nokogiri, Ubuntu:16.04:LTS: ruby-nokogiri, Ubuntu:18.04:LTS: ruby-nokogiri, Ubuntu:Pro:20.04:LTS: ruby-nokogiri, Ubuntu:Pro:22.04:LTS: ruby-nokogiri, Ubuntu:24.04:LTS: ruby-nokogiri, Ubuntu:25.10: ruby-nokogiri, Ubuntu:26.04:LTS: ruby-nokogiri

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.