Security Digest · Vulnerability record · Known exploited
CVE-2026-9198: IBM Langflow Code Injection Vulnerability
Exploited in the wild (CISA KEV). IBM Langflow OSS 1.0.0 through 1.10.0 allows unauthenticated attackers to chain /api/v1/autologin (mints SUPERUSER tokens to any network caller) with /api/v1/validate/code (executes user code via exec()) to achieve full RCE on default Langflow deployments
CISA KEV · added 2026-08-04 CVSS 9.8 Critical EPSS 28.7% · p98 Act now
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run IBM Langflow. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-08-04, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-08-07; treat that as the outer limit, not the target.
- EPSS 28.7%, percentile 98: FIRST’s model estimates a 28.7% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Editorial verdict: Act now. Langflow CVE-2026-9198: Exploited Unauthenticated RCE — Langflow is now the most repeatedly exploited AI-agent builder on CISA's list; any network-reachable instance below 1.10.1 should be patched today and checked for compromise.
What it is
IBM Langflow OSS 1.0.0 through 1.10.0 allows unauthenticated attackers to chain /api/v1/autologin (mints SUPERUSER tokens to any network caller) with /api/v1/validate/code (executes user code via exec()) to achieve full RCE on default Langflow deployments
CISA’s summary
Langflow contains a code injection vulnerability that allows unauthenticated attackers to achieve full remote code execution on default Langflow deployments.
Weakness type: CWE-94.
Product: IBM Langflow · Assigned by: ibm · Published: 2026-07-17
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| IBM | Langflow OSS | 1.0.0 <= 1.10.0 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ibm | 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2026-08-04; federal due date 2026-08-07. Known ransomware use: Unknown.
- CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- CISA SSVC assessment: exploitation active, automatable yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 28.66% probability of exploitation activity in the next 30 days; percentile 98.
Timeline
- — CVE record published by ibm
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — erroneo.us brief: Langflow CVE-2026-9198: Exploited Unauthenticated RCE
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- ibm.com ibm.com
Vulnerability records
- CVE.org record CVE-2026-9198 cve.org
- NVD entry CVE-2026-9198 nvd.nist.gov