Apache Qpid Proton Dotnet: Unbounded disposition range handling can lead to denial of service

published 2026-08-05 3 mo ago modified 2026-10-24 16 d ago also EUVD-2026-53092

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits: 0; none known

An authenticated attacker can craft a disposition frame with large or illegal ranges causing excessive CPU usage due to naive range handling, leading to denial of service.

This issue affects Apache Qpid Proton-Dotnet: through 1.0.0.

Users are recommended to upgrade to version 1.1.0, which fixes the issue.

Patch / fix

fixed in 1

apache qpid_proton-dotnet 1.1.0

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 3 mo ago (2026-08-05)

Exploit prediction

0.65% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

Apache Software Foundation Apache Qpid Proton Dotnet

Classification

Weakness

CWE-606 Unchecked Input for Loop Condition

References

lists.apache.org /thread/5ndlowz29464ytj98gz9z9ljhwnmb2hm
vendor-advisory, mailing-list
openwall.com /lists/oss-security/2026/08/04/25
mailing-list, third-party-advisory

Sources

CVE List CVE-2026-67554
NVD CVE-2026-67554

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary