CVE-2026-41488
angchain-openai: Image token counting SSRF protection can be bypassed via DNS rebinding
CVSS Score
3.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-918 |
| Vendor | langchain-ai |
| Product | langchain-openai |
| Published | Apr 24, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
langchain-ai / langchain-openai
< 1.1.14