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GHSA-9cv2-cfxc-v4v2
No affected components available
Summary
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.
Nokogiri 1.19.4 checks for missing native data pointers and raises a RuntimeError.
JRuby is not affected.
Severity
The Nokogiri maintainers have evaluated this as low severity. This is only triggered by a programming error. It requires application code to call .allocate directly on a native-backed class and then invoke methods on the resulting uninitialized object. It cannot be triggered by untrusted input or through normal use of the public API.
Mitigation
Upgrade to Nokogiri 1.19.4 or later.
Avoid calling .allocate directly on Nokogiri native-backed classes. Use the documented constructors and factory methods instead.
Credit
This issue was responsibly reported by Zheng Yu from depthfirst.com.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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