| Component | LangChain |
| Severity | medium (CVSS 5.9) |
| CVSS vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Published (NVD) | 2024-03-26 |
| Last modified | 2026-06-17 |
| Affected versions | langchain >= 0.1.4, <= 0.1.35 |
| Fixed in | see the vendor advisory |
| Weakness | CWE-776 |
| CISA KEV | not listed |
NVD description
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).
What to do
- NVD lists no fixed version yet: follow the vendor advisory below and keep LangChain off the public internet until a fix ships.
- Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2024-1455
- https://github.com/langchain-ai/langchain/commit/727d5023ce88e18e3074ef620a98137d26ff92a3
- https://huntr.com/bounties/4353571f-c70d-4bfd-ac08-3a89cecb45b6
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