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Vulnerability record · CVE-2026-66257 · published 5 August 2026

CVE-2026-66257: Apache qpid proton-j allocation without limits vulnerability

Apache · Qpid Proton J

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.

7.5 CVSS 3.1 High EPSS 0.77% · top 46.1% CWE-770 · Allocation without limits
7.5CVSS 3.1 base score
0.77%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
7 Aug 2026Last modified by NVD

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 Proton-J: through 0.34.1. Users are recommended to upgrade to version 0.35.0, which fixes the issue.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread/dnczt6bgfcq2x6q8ljco177h1qmv59fm Mailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2026/08/04/8 Mailing ListThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2026-66274Apache qpid proton-j vulnerabilityA pre-authentication attacker could leverage type nesting to cause a StackOverflowError potentially leading to denial of service. This issue affects …EPSS 0.77%7.5CVE-2026-66273Apache qpid proton-j vulnerabilityA pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to potential denial of service. This issu…EPSS 0.77%7.4CVE-2018-17187Apache qpid proton-j improper certificate validation vulnerabilityThe Apache Qpid Proton-J transport includes an optional wrapper layer to perform TLS, enabled by use of the 'transport.ssl(...)' methods. Unless a ve…EPSS 2.5%6.5CVE-2026-66275Apache qpid proton-j allocation without limits vulnerabilityAn authenticated attacker could exceed the session flow control incoming window potentially leading to denial of service. This issue affects Apache Q…EPSS 0.65%6.5CVE-2026-66276Apache qpid proton-j vulnerabilityAn authenticated attacker can craft a disposition frame with large or illegal ranges causing excessive CPU usage due to naive range handling, leading…EPSS 0.65%6.5CVE-2026-66277Apache qpid proton-j allocation without limits vulnerabilityIt was not possible to govern the maximum number of transfer frames per incoming delivery, enabling an authenticated attacker to cause excessive reso…EPSS 0.65%8.6CVE-2020-3569Cisco IOS XR DVMRP IGMP packet handling memory exhaustionCisco IOS XR Software mishandles IGMP packets in its Distance Vector Multicast Routing Protocol (DVMRP) feature, allowing crafted traffic to crash th…KEVEPSS 3.3%analysed8.6CVE-2020-3566Cisco IOS XR DVMRP IGMP queue flaw causes memory exhaustionCisco IOS XR Software mishandles queue management for IGMP packets in its DVMRP feature, allowing uncontrolled memory consumption. An unauthenticated…KEVEPSS 3.7%analysed

Source: NIST National Vulnerability Database (record CVE-2026-66257), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.