CVE-2026-66257

EUVD-2026-53051
A pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion leading to 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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 36.52%
Affected Products (NVD)
VendorProductVersion
apacheqpid_proton-j
𝑥
< 0.35.0
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://lists.apache.org/thread/dnczt6bgfcq2x6q8ljco177h1qmv59fm
http://www.openwall.com/lists/oss-security/2026/08/04/8