VDB
CVE-2026-66273
CVE-2026-66273
PUBLISHED
CVSS 7.5 HIGH
Reported by apache · Published August 5, 2026
proton-j is fixed in 0.34.1 (Maven Central)
A pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to potential denial of service. This issue affects Apache Qpid Proton-J: through 0.34.1. Users are recommended to upgrade to version 0.35.0, which fixes the issue.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| org.apache.qpid:proton-j | Maven Central | 0.34.1 |
| logstash-8.19 | Chainguard | 8.19.21-r2 |
| qpid_proton-j | apache | 0.35.0 |
Risk scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Qpid Proton-J | 0 |
| chainguard | logstash-8.19 | 0 |
| Apache Software Foundation | Apache Qpid Proton-J | 0 |
Timeline
- Aug 5, 2026 CVE Published
- Aug 6, 2026 CVE Updated
- Aug 7, 2026 EPSS Score (26 in total, the first dated here)
- Sep 4, 2026 Distribution Patch (4 in total, the first dated here)
- Sep 4, 2026 Security Advisory (4 in total, the first dated here)
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2026-66273
vulnetix vdb fixes CVE-2026-66273Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2026-66273/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart
References
- vendor-advisory
- http://www.openwall.com/lists/oss-security/2026/08/04/9 url