#VU125667 Server-Side Request Forgery (SSRF) in LangChain - CVE-2026-26013
Published: April 9, 2026
Vulnerability identifier: #VU125667
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-26013
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
LangChain
LangChain
Software vendor:
LangChain
LangChain
Description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to server-side request forgery (ssrf) in ChatOpenAI.get_num_tokens_from_messages() when processing messages containing user-supplied image_url values for token counting. A remote attacker can supply a crafted image URL to cause a denial of service.
The issue is blind SSRF, and token counting may occur outside of model invocation such as in logging, metrics, or token budgeting flows.
Remediation
Install security update from vendor's website.