Vulnerability · Published Aug 5, 2026 · Assigned by apache
CVE-2026-67588Apache Qpid ProtonJ2: Unbounded symbol value caching can lead to pre-authentication resource exhaustion
High 7.5
In plain English
A high-severity resource allocation without limits in Apache Qpid ProtonJ2 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 0.8% (higher than 56% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.8%top 44.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion leading to denial of service. This issue affects Apache Qpid ProtonJ2: through 1.1.0. Users are recommended to upgrade to version 1.2.0, which fixes the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | qpid-proton | no fix listed | DEBIAN-CVE-2026-67588 |
| Debian:13 | qpid-proton | no fix listed | DEBIAN-CVE-2026-67588 |
| Debian:14 | qpid-proton | no fix listed | DEBIAN-CVE-2026-67588 |
| Ubuntu:22.04:LTS | qpid-proton | no fix listed | UBUNTU-CVE-2026-67588 |
| Ubuntu:24.04:LTS | qpid-proton | no fix listed | UBUNTU-CVE-2026-67588 |
| Ubuntu:26.04:LTS | qpid-proton | no fix listed | UBUNTU-CVE-2026-67588 |
| Ubuntu:26.10 | qpid-proton | no fix listed | UBUNTU-CVE-2026-67588 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Qpid ProtonJ2 | 0 – through 1.1.0 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H