# CVE-2026-92362: ag-ui-protocol ag-ui resource exhaustion in SSE frame parser

Source: https://junglewise.ai/threats/cve-2026-92362-ag-ui-protocol-ag-ui-resource-exhaustion-in-sse-frame-parser  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-16. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-92362 · Severity: high · CVSS 7.3 · Published 2026-09-16

AG-UI is a protocol and library used to integrate AI agents into frontend applications. The SSE (Server-Sent Events) frame parser in the Rust SDK has an unbounded buffering vulnerability that allows a remote server to cause memory exhaustion by sending oversized frames or using CRLF line terminators per the SSE specification, leading to denial of service.

Technologies: [Ag-Ui-Protocol Ag-Ui](https://junglewise.ai/threats/technologies/ag-ui). Vendors: [Ag-Ui-Protocol](https://junglewise.ai/threats/vendors/ag-ui-protocol).

## Quick answers

**Is CVE-2026-92362 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-92362 being exploited in the wild.

**How severe is CVE-2026-92362?** High severity, with a CVSS score of 7.3, published 16 September 2026.

**Which products and versions are affected?** Ag-Ui-Protocol Ag-Ui 1.0.

**Is there a fix for CVE-2026-92362?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-92362?** Check whether you run Ag-Ui-Protocol Ag-Ui at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in crates/ag-ui-client/src/sse.rs, where the SSE frame parser implements unbounded buffering without per-frame or total-size limits (CWE-400). The parser only recognizes LF-style line termination and fails to handle CRLF or lone CR characters as line endings, which are permitted by the SSE specification. When a remote endpoint sends frames with CRLF terminators or oversized payloads, the parser accumulates bytes indefinitely in its buffer, exhausting available memory. The attack requires only network connectivity to a server controlled by the attacker or a compromised endpoint; no authentication or user interaction is needed. A fix is pending acceptance in a pull request.

## Affected products

- ag-ui-protocol ag-ui 1.0

## Timeline

- 2026-09-16: disclosed
- other: Issue reported 2026-08-18

## References

- [https://github.com/ag-ui-protocol/ag-ui/](https://github.com/ag-ui-protocol/ag-ui/)
- [https://github.com/ag-ui-protocol/ag-ui/issues/2439](https://github.com/ag-ui-protocol/ag-ui/issues/2439)

## Related threats

- [ag-ui-protocol ag-ui resource exhaustion in interrupt expiry](https://junglewise.ai/threats/cve-2026-120237-a-flaw-has-been-found-in-ag-ui-protocol-ag-ui-up-to-0-0-58)
- [ag-ui Transport Decoder Handler improper input validation](https://junglewise.ai/threats/cve-2026-120236-a-vulnerability-was-detected-in-ag-ui-protocol-ag-ui-up-to-0-0)
- [ag-ui SSE parser resource exhaustion](https://junglewise.ai/threats/cve-2026-120235-a-security-vulnerability-has-been-detected-in-ag-ui-protocol-ag)
- [ag-ui HTTP Transport unbounded response buffering](https://junglewise.ai/threats/cve-2026-120234-a-weakness-has-been-identified-in-ag-ui-protocol-ag-ui-up-to-0-0)
- [ag-ui HttpAgent credential and request body forwarding via redirect](https://junglewise.ai/threats/cve-2026-120233-a-security-flaw-has-been-discovered-in-ag-ui-protocol-ag-ui-up)