# CVE-2026-81265: IBM Langflow OSS server-side request forgery via URL validation bypass

Source: https://junglewise.ai/threats/cve-2026-81265-ibm-langflow-oss-server-side-request-forgery-via-url-validation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-10. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-81265 · Severity: high · CVSS 7.5 · Published 2026-09-10

IBM Langflow OSS is an open-source platform for building AI workflows. It contains multiple server-side request forgery (SSRF) vulnerabilities that allow attackers to make unauthorized outbound requests from the server to internal networks, cloud metadata services, or attacker-controlled hosts. Exploits could leak sensitive API keys, enumerate internal resources, or facilitate further network attacks.

Technologies: [IBM Langflow OSS](https://junglewise.ai/threats/technologies/langflow-oss), [Langflow](https://junglewise.ai/threats/technologies/langflow). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm), [Langflow](https://junglewise.ai/threats/vendors/langflow).

## Quick answers

**Is CVE-2026-81265 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-81265 being exploited in the wild.

**How severe is CVE-2026-81265?** High severity, with a CVSS score of 7.5, published 10 September 2026.

**Which products and versions are affected?** IBM Langflow OSS 1.0.0 through 1.11.5.

**Is there a fix for CVE-2026-81265?** A patch was published on 2026-09: Fixed in version 1.11.6 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-81265 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-81265?** Check whether you run IBM Langflow OSS or Langflow at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

CVE-2026-81265 is one of four related SSRF vulnerabilities in Langflow OSS 1.0.0–1.11.5 stemming from missing or inconsistent egress validation on server-side URL fetches. The OpenAI Chat Model component and other connectors (DataStax Astra DB, IBM Db2) accept user-controlled URLs without applying the platform's SSRF guard, and some are reachable via unauthenticated public flow build endpoints. An attacker can supply RFC 1918, loopback, or cloud metadata addresses to trigger outbound requests; in some cases, the server forwards operator API keys to the attacker's host. The vulnerability requires no user interaction and network reachability to the Langflow server. IBM recommends upgrading to version 1.11.6 or later.

## Affected products

- IBM Langflow OSS 1.0.0 through 1.11.5

## Timeline

- 2026-09-08: disclosed: IBM security bulletin published
- 2026-09: patched: Fixed in version 1.11.6

## References

- [https://www.ibm.com/support/pages/node/7286665](https://www.ibm.com/support/pages/node/7286665)

## Related threats

- [IBM Langflow OSS path traversal arbitrary file read and write](https://junglewise.ai/threats/cve-2026-97677-ibm-langflow-oss-1-0-0-through-1-12-2-an-authenticated-flow)
- [IBM Langflow OSS authentication bypass](https://junglewise.ai/threats/cve-2026-93680-ibm-langflow-oss-1-0-0-through-1-12-8-could-allow-a-remote)
- [IBM Langflow OSS denial of service via resource exhaustion](https://junglewise.ai/threats/cve-2026-90991-ibm-langflow-oss-1-0-0-through-1-12-4-could-allow-a-remote)
- [IBM Langflow OSS path traversal arbitrary file overwrite](https://junglewise.ai/threats/cve-2026-77819-ibm-langflow-oss-1-0-0-through-1-12-3-could-allow-a-remote)
- [IBM Langflow OSS improper sanitization of secrets in exports](https://junglewise.ai/threats/cve-2026-77817-ibm-langflow-oss-1-0-0-through-1-12-4-could-allow-a-remote)