AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

OR
          *cpe:2.3:a:langchain:langchain:*:*:*:*:*:*:*:* versions from (including) 0.1.4 up to (including) 0.1.35

CVE: https://github.com/langchain-ai/langchain/commit/727d5023ce88e18e3074ef620a98137d26ff92a3 Types: Patch

CVE: https://huntr.com/bounties/4353571f-c70d-4bfd-ac08-3a89cecb45b6 Types: Exploit, Third Party Advisory

huntr.dev: https://github.com/langchain-ai/langchain/commit/727d5023ce88e18e3074ef620a98137d26ff92a3 Types: Patch

huntr.dev: https://huntr.com/bounties/4353571f-c70d-4bfd-ac08-3a89cecb45b6 Types: Exploit, Third Party Advisory

https://github.com/langchain-ai/langchain/commit/727d5023ce88e18e3074ef620a98137d26ff92a3

https://huntr.com/bounties/4353571f-c70d-4bfd-ac08-3a89cecb45b6

The XMLOutputParser in LangChain uses the etree module from the XML parser in the standard python library which has some XML vulnerabilities; see: https://docs.python.org/3/library/xml.html

This primarily affects users that combine an LLM (or agent) with the `XMLOutputParser` and expose the component via an endpoint on a web-service. 

This would allow a malicious party to attempt to manipulate the LLM to produce a malicious payload for the parser that would compromise the availability of the service.

A successful attack is predicated on:

1. Usage of XMLOutputParser
2. Passing of malicious input into the XMLOutputParser either directly or by trying to manipulate an LLM to do so on the users behalf
3. Exposing the component via a web-service

A vulnerability in the langchain-ai/langchain repository allows for a Billion Laughs Attack, a type of XML External Entity (XXE) exploitation. By nesting multiple layers of entities within an XML document, an attacker can cause the XML parser to consume excessive CPU and memory resources, leading to a denial of service (DoS). 

huntr.dev https://github.com/langchain-ai/langchain/commit/727d5023ce88e18e3074ef620a98137d26ff92a3 [No types assigned]

The XMLOutputParser in LangChain uses the etree module from the XML parser in the standard python library which has some XML vulnerabilities; see: https://docs.python.org/3/library/xml.html

This primarily affects users that combine an LLM (or agent) with the `XMLOutputParser` and expose the component via an endpoint on a web-service. 

This would allow a malicious party to attempt to manipulate the LLM to produce a malicious payload for the parser that would compromise the availability of the service.

A successful attack is predicated on:

1. Usage of XMLOutputParser
2. Passing of malicious input into the XMLOutputParser either directly or by trying to manipulate an LLM to do so on the users behalf
3. Exposing the component via a web-service

huntr.dev AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

huntr.dev CWE-776

huntr.dev https://huntr.com/bounties/4353571f-c70d-4bfd-ac08-3a89cecb45b6 [No types assigned]