Apache Qpid Proton-J: Unbounded type nesting can lead to pre-authentication stackoverflow

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0077, the 55th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 5 Aug 2026, 09:31 UTC Confirmed by GitHub Advisory Database
2. 3 Nov 2026, 21:45 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-p2gc-fm5w-94jj
• OSV: GHSA-p2gc-fm5w-94jj
• nvd.nist.gov/vuln/detail/CVE-2026-66274
• github.com/apache/qpid-proton-j/commit/92047419cc87bab6220e7adeb354958d8109618e
• github.com/apache/qpid-proton-j
• github.com/apache/qpid-proton-j/releases/tag/0.35.0
• lists.apache.org/thread/h7xolzws2by2qhdjf7scbx87foxojb5h
• www.openwall.com/lists/oss-security/2026/08/04/10

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.