CVE-2026-105900 Overview
CVE-2026-105900 is an Improper Input Validation vulnerability [CWE-20] affecting Adobe ColdFusion. An unauthenticated remote attacker can send crafted input to the application and trigger a crash, resulting in a denial-of-service condition. Exploitation requires no user interaction and no privileges. Adobe addressed the issue in security bulletin APSB26-144.
The vulnerability targets availability only. It does not expose confidential data or allow modification of application state. Affected organizations running internet-facing ColdFusion servers face service disruption risk until the vendor patch is applied.
Critical Impact
An unauthenticated network attacker can crash ColdFusion application services and interrupt availability for all users.
Affected Products
- Adobe ColdFusion (versions listed in Adobe advisory APSB26-144)
- ColdFusion application servers exposed to untrusted network input
- Web applications running on vulnerable ColdFusion releases
Discovery Timeline
- 2026-10-13 - CVE-2026-105900 published to the National Vulnerability Database
- 2026-10-14 - Entry last modified in NVD
Technical Details for CVE-2026-105900
Vulnerability Analysis
The flaw stems from ColdFusion failing to properly validate input received over the network. When the application processes a malformed request, the parsing or handling logic reaches an unrecoverable state and terminates the process. The result is loss of availability for the ColdFusion service and any applications it hosts.
Because the attack vector is network-based and requires no authentication, exploitation can be automated at scale. An attacker only needs reachability to the ColdFusion endpoint to trigger the condition. Repeated exploitation can keep the service offline for extended periods.
The EPSS score for this vulnerability is 0.508% with a percentile of 41.9 as of 2026-10-14. No public proof-of-concept or exploit code has been published at the time of writing.
Root Cause
The root cause is missing or insufficient validation of attacker-controlled input, classified under [CWE-20] Improper Input Validation. ColdFusion processes the malformed payload without rejecting it at the boundary, allowing it to reach code paths that cannot safely handle the data. Adobe has not published additional technical specifics beyond the APSB26-144 advisory.
Attack Vector
Exploitation occurs over the network against a reachable ColdFusion instance. The attacker sends a crafted request containing input that the server fails to validate. The server process crashes, terminating all active sessions and halting request processing until service restoration. No user interaction and no credentials are required.
No verified exploitation code is publicly available. Refer to the Adobe ColdFusion Security Update APSB26-144 for vendor-provided details.
Detection Methods for CVE-2026-105900
Indicators of Compromise
- Unexpected ColdFusion service crashes or restarts logged in coldfusion-out.log or Windows Event Viewer
- Spikes in HTTP 5xx responses from ColdFusion endpoints during or immediately after inbound requests from unknown sources
- JVM termination events on ColdFusion application server hosts without administrator action
Detection Strategies
- Monitor ColdFusion application and JVM logs for abnormal termination patterns and correlate with inbound request logs
- Deploy web application firewall rules that log and alert on malformed requests to ColdFusion URIs such as /CFIDE/ and /cfusion/
- Alert on repeated service restarts within short time windows on hosts running ColdFusion
Monitoring Recommendations
- Forward ColdFusion server logs, IIS or Apache access logs, and host-level process events to a centralized log platform for correlation
- Track availability metrics for ColdFusion services and generate alerts when uptime drops below defined thresholds
- Review network telemetry for anomalous request patterns targeting ColdFusion ports from untrusted sources
How to Mitigate CVE-2026-105900
Immediate Actions Required
- Apply the ColdFusion security update referenced in Adobe advisory APSB26-144 as the primary remediation
- Restrict network access to ColdFusion administrative and application endpoints to trusted sources using firewall rules
- Place vulnerable servers behind a web application firewall configured to filter malformed requests until patching completes
Patch Information
Adobe published the fix in security bulletin APSB26-144. Administrators should consult the Adobe ColdFusion Security Update for affected version ranges and the corresponding patched builds. Apply the vendor-supplied update to all ColdFusion instances across production, staging, and development environments.
Workarounds
- Limit exposure of ColdFusion services to the public internet where business requirements permit
- Enforce rate limiting at the upstream proxy or load balancer to reduce the impact of repeated crash attempts
- Configure automatic service restart with monitoring so that successful crashes result in minimal downtime while patching is scheduled
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
