CVE-2026-88002 open-webui CVE debrief

Who should care

Defenders responsible for Open WebUI installations, particularly those using versions 0.5.0 through 0.11.1, should assess exposure and apply the patch to prevent potential denial-of-service conditions.

Why it matters

CVE-2026-88002 is a vulnerability in Open WebUI that could lead to denial-of-service conditions. Defenders should prioritize verifying exposure and applying the patch.

• Denial-of-service conditions due to non-terminating walk and memory growth.
• Potential for persistent impact across process restarts.
• Need for verification of exposure and application of the patch.

Technical summary

The message-chain reconstruction helper in Open WebUI's backend/open_webui/utils/misc.py file has a vulnerability that allows an authenticated user to trigger a non-terminating walk, blocking the async event loop and growing memory until termination. This issue is fixed in version 0.11.1. The vulnerability impacts the availability of the system, allowing an authenticated user to cause a denial-of-service condition. Defenders should prioritize verifying exposure and applying the patch to prevent potential denial-of-service conditions.

Defensive priority

Defenders should prioritize verifying exposure and applying the patch, as this vulnerability could lead to denial-of-service conditions.

Recommended defensive actions

• Verify if Open WebUI is used in the environment and if versions 0.5.0 through 0.11.1 are installed.
• Check for id-less messages in parent cycles and assess the potential for denial-of-service conditions.
• Apply the patch by upgrading to Open WebUI version 0.11.1 or later.
• Monitor for potential exploitation attempts and anomalous activity.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• 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 NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. The vulnerability is caused by the message-chain reconstruction helper in Open WebUI's backend/open_webui/utils/misc.py file, which has a flaw that allows an authenticated user to trigger a non-terminating walk. The issue is fixed in version 0.11.1. Defenders should verify exposure and apply the patch. The source detail is limited, so defenders should exercise caution and verify the information with other可靠的

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.