Vulnerability · Published Oct 29, 2026 · Assigned by apache
CVE-2026-115942Apache Qpid Proton C: Verifying non compliant TLS wildcard cert can cause stack buffer overflow read
High 7.5
In plain English
A high-severity out-of-bounds read in Apache Qpid Proton C from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | qpid-proton | no fix listed | DEBIAN-CVE-2026-115942 |
| Debian:13 | qpid-proton | no fix listed | DEBIAN-CVE-2026-115942 |
| Debian:14 | qpid-proton | no fix listed | DEBIAN-CVE-2026-115942 |
| Ubuntu:22.04:LTS | qpid-proton | no fix listed | UBUNTU-CVE-2026-115942 |
| Ubuntu:24.04:LTS | qpid-proton | no fix listed | UBUNTU-CVE-2026-115942 |
| Ubuntu:26.04:LTS | qpid-proton | no fix listed | UBUNTU-CVE-2026-115942 |
| Ubuntu:26.10 | qpid-proton | no fix listed | UBUNTU-CVE-2026-115942 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Qpid Proton C | 0 – through 0.40.0 |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N