CVE-2026-120233 ag-ui-protocol CVE debrief

Who should care

Defenders responsible for systems using ag-ui-protocol ag-ui should assess exposure and verify the affected versions. Defenders should prioritize verifying the affected versions and assessing exposure in their systems. The vulnerability allows remote information disclosure and has a CVSS score of 5.5.

Why it matters

Defenders should prioritize verifying the affected versions and assessing exposure in their systems. The vulnerability allows remote information disclosure and has a CVSS score of 5.5.

• Verify affected versions and assess exposure
• Review and apply the pull request to fix the issue
• Monitor for potential manipulation of the HttpAgent component

Technical summary

The vulnerability affects an unknown function of the file sdks/typescript/packages/client/src/agent/http.ts of the component HttpAgent in ag-ui-protocol ag-ui up to 0.0.58. Performing a manipulation results in information disclosure. The vulnerability allows remote information disclosure and has a CVSS score of 5.5. Defenders should prioritize verifying the affected versions and assessing exposure in their systems. The exploit has been released to the public and may be used for attacks. The pull request to fix this issue awaits acceptance.

Defensive priority

Defenders should prioritize verifying the affected versions and assessing exposure in their systems.

Recommended defensive actions

• Verify the version of ag-ui-protocol ag-ui in use and assess exposure
• Review the affected file sdks/typescript/packages/client/src/agent/http.ts for potential manipulation
• Consider applying the pull request to fix the issue
• 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 NVD entry provide limited information about the vulnerability. Further verification is required to determine the affected versions and potential impact. The vulnerability affects an unknown function of the file sdks/typescript/packages/client/src/agent/http.ts of the component HttpAgent in ag-ui-protocol ag-ui up to 0.0.58. The attack can be initiated remotely.

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.