VulnerabilityAnalyzed

CVE-2026-67588

A pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion leading to denial of service.

HIGH 7.5EPSS 0.48%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.48%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.48% probability · 40th percentile
CISA KEV: Not listed
Weakness: CWE-770
Affected: apache/qpid protonj2
Source: security@apache.org

References

https://lists.apache.org/thread/vk4j02dzggfdrdkwvzmqo4jro2tgj0jtMailing List, Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/08/04/27Mailing List, Third Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.