CVE-2026-41481
Description
A flaw was found in LangChain and langchain-text-splitters. This vulnerability, a Server-Side Request Forgery (SSRF) bypass, allows a remote attacker to redirect a seemingly safe URL to internal network resources. By exploiting unvalidated redirects, an attacker could access sensitive data from internal, localhost, or cloud metadata endpoints. This could result in information disclosure or data exfiltration if the application processes and exposes the content from these redirected requests.
Statement
This is an Important information disclosure flaw in LangChain and langchain-text-splitters, affecting Red Hat products that process URLs using these components. The vulnerability allows a Server-Side Request Forgery (SSRF) redirect bypass, where initial URL validation is circumvented by unvalidated redirect targets. This could enable an attacker to access internal network resources and potentially exfiltrate sensitive data if the application exposes the content from these redirected requests.
Mitigation
To mitigate this issue, Red Hat customers should ensure that applications utilizing LangChain's HTMLHeaderTextSplitter.split_text_from_url() function do not process untrusted or unvalidated URLs. Implement strict input validation for all URL inputs to prevent redirection to internal network resources. If an application exposes the content of processed Document objects to external requesters, consider reconfiguring the application to restrict such exposure.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | 6.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | Required | N/A | Required |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | None | N/A | None |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
Integrity
Technical Impact: Execute Unauthorized Code or Commands
Access Control
Technical Impact: Bypass Protection Mechanism
By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.
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