CVE-2026-26013: LangChain is a framework for building agents and LLM-powered applications. Prior to 1.2.11, the ChatOpenAI.get_num_token
lowvulnerabilityLLM-Specific
security
Summary
LangChain (a framework for building AI agents and applications powered by large language models) versions before 1.2.11 have a vulnerability where the ChatOpenAI.get_num_tokens_from_messages() method doesn't validate image URLs, allowing attackers to perform SSRF attacks (server-side request forgery, where an attacker tricks a server into making unwanted requests to other systems). This vulnerability was fixed in version 1.2.11.
Solution / Mitigation
Update LangChain to version 1.2.11 or later. The vulnerability is fixed in 1.2.11.
Vulnerability Details
CVSS Score
3.7(low)
EPSS (30-day exploit probability)
EPSS: 0.0%
Classification
Attack Type
Supply Chain
Attack SophisticationModerate
Impact (CIA+S)
confidentiality
AI Component TargetedAPI
Affected Vendors
LangChain
Related Issues
Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-26013
First tracked: February 15, 2026 at 08:35 PM
Classified by LLM (prompt v3) · confidence: 92%