| Component | LangChain |
| Severity | low (CVSS 3.1) |
| CVSS vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N |
| Published (NVD) | 2026-04-24 |
| Last modified | 2026-06-17 |
| Affected versions | langchain-openai < 1.1.14 |
| Fixed in | 1.1.14 |
| Weakness | CWE-918 |
| CISA KEV | not listed |
NVD description
LangChain is a framework for building agents and LLM-powered applications. Prior to 1.1.14, langchain-openai's _url_to_size() helper (used by get_num_tokens_from_messages for image token counting) validated URLs for SSRF protection and then fetched them in a separate network operation with independent DNS resolution. This left a TOCTOU / DNS rebinding window: an attacker-controlled hostname could resolve to a public IP during validation and then to a private/localhost IP during the actual fetch.
What to do
- Upgrade LangChain to
1.1.14or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-41488
- https://github.com/langchain-ai/langchain/security/advisories/GHSA-r7w7-9xr2-qq2r
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