CVE-2026-41488
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.
- CVSS 3.1
- 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N - EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-10-26)
- CWE
- CWE-918
- Published
- Modified
- Record from
- the NVD, synced
Affected
- langchain:langchain-openai
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-r7w7-9xr2-qq2r | PyPI | langchain-openai | <1.1.14 | 1.1.14 |
| PYSEC-2026-76 | PyPI | langchain-openai | <1.1.14 | 1.1.14 |