CVE-2026-77468 LycheeOrg CVE debrief

Who should care

Defenders responsible for Lychee installations, particularly those exposed to the internet or untrusted networks, should assess their exposure and prioritize upgrading to version 7.7.0 or later.

Why it matters

CVE-2026-77468 is a medium-severity vulnerability in Lychee that allows remote attackers to consume server CPU and obtain API schema information. Defenders should prioritize verifying exposure and upgrading to version 7.7.0 or later.

• Potential for denial-of-service (DoS) condition due to excessive CPU consumption
• Exposure of sensitive API schema information
• Need for verification of /docs/api endpoint exposure and remediation
• Potential for increased server load and resource utilization

Technical summary

The vulnerability is caused by the lack of authentication and throttling on the GET /docs/api endpoint in Lychee versions prior to 7.7.0. This allows remote attackers to repeatedly request the endpoint and consume server CPU, potentially leading to a denial-of-service (DoS) condition. The endpoint exposes Scramble-generated OpenAPI documentation configured by config/scramble.php to unauthenticated callers after installation. A remote attacker can repeatedly request the unthrottled route to consume server CPU and obtain a detailed map of the API surface and parameter schema.

Defensive priority

Defenders should prioritize verifying exposure of the /docs/api endpoint and upgrading to version 7.7.0 or later.

Recommended defensive actions

• Verify exposure of the /docs/api endpoint in Lychee installations
• Upgrade to Lychee version 7.7.0 or later
• Monitor server CPU usage and API request logs for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability, affected versions, and fixed version. The vulnerability is caused by the lack of authentication and throttling on the GET /docs/api endpoint in Lychee versions prior to 7.7.0. This allows remote attackers to repeatedly request the endpoint and consume server CPU, potentially leading to a denial-of-service (DoS) condition. Defenders should verify exposure of the /docs/api endpoint and upgrade to version 7.7.0 or later. The evidence is based on the CVE record and the N

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.