CVE-2026-66277: It was not possible to govern the maximum number of transfer frames per incoming delivery, enabling an authent

Q: How do I fix CVE-2026-66277?

qpid proton-j: upgrade to 0.35.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-66277 being exploited?

CVE-2026-66277 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-66277 affect?

CVE-2026-66277 affects qpid proton-j. Severity is medium (CVSS 6.5). It was not possible to govern the maximum number of transfer frames per incoming delivery, enabling an authenticated attacker to cause excessive resource usage and potential denial of service. This issue affects Apache Qpid Proton-J: throu

Q: How urgent is CVE-2026-66277?

Priority 40/100. On your watchlist

This month

MEDIUM 6.5WATCHLISTUPGRADE

CVE-2026-66277 is a medium-severity flaw (CVSS 6.5) affecting qpid proton-j. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

It was not possible to govern the maximum number of transfer frames per incoming delivery, enabling an authenticated attacker to cause excessive resource usage and potential 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.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-08-05
Last modified	2026-10-23

Publisher (CNA): Apache Software Foundation · Vendor: apache

Am I affected?

Timeline

2026-08-05 07:16 UTCPublished CVE record published
2026-10-23 21:10 UTCUpdated Record last modified

apache qpid proton-j UPGRADE

Affected: < 0.35.0

Fixed in: 0.35.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy qpid-proton-j || rpm -q qpid-proton-j || qpid-proton-j --version

2. UPGRADE to 0.35.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade qpid-proton-j

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade qpid-proton-j

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora ELN · ntpd-rs · FIXED · 1.7.2-3.eln159 · FEDORA-2026-57e4a99310 · source

sudo dnf upgrade --advisory=FEDORA-2026-57e4a99310

Fedora 46 · moby-engine · FIXED · 29.9.2-2.fc46 · FEDORA-2026-4856be87b3 · source

sudo dnf upgrade --advisory=FEDORA-2026-4856be87b3

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-66277?

qpid proton-j: upgrade to 0.35.0. Exact commands for each OS are on this page.

Is CVE-2026-66277 being exploited?

CVE-2026-66277 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-66277 affect?

CVE-2026-66277 affects qpid proton-j. Severity is medium (CVSS 6.5). It was not possible to govern the maximum number of transfer frames per incoming delivery, enabling an authenticated attacker to cause excessive resource usage and potential denial of service. This issue affects Apache Qpid Proton-J: throu

How urgent is CVE-2026-66277?

Priority 40/100. On your watchlist

Related CVEs

CVE-2026-66257 HIGH 7.5 UPGRADE A pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion leadi
CVE-2026-66273 HIGH 7.5 UPGRADE A pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to
CVE-2026-66274 HIGH 7.5 UPGRADE A pre-authentication attacker could leverage type nesting to cause a StackOverflowError potentially leading to
CVE-2026-66275 MEDIUM 6.5 UPGRADE An authenticated attacker could exceed the session flow control incoming window potentially leading to denial
CVE-2026-66276 MEDIUM 6.5 UPGRADE An authenticated attacker can craft a disposition frame with large or illegal ranges causing excessive CPU usa

References

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