CVE-2026-57967: An unauthenticated remote attacker can craft a CORE protocol SESSION_REATTACH packet to steal an existing sess

This week

CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2026-57967 is a critical-severity flaw (CVSS 9.8) affecting artemis. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An unauthenticated remote attacker can craft a CORE protocol SESSION_REATTACH packet to steal an existing session and assume ongoing execution of the previously authenticated session. This issue affects Apache Artemis: from 2.50.0 through 2.56.0; Apache ActiveMQ Artemis: from 1.0.0 through 2.44.0. Users are recommended to upgrade to version 2.57.0, which fixes the issue.

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-306
Published	2026-09-10
Last modified	2026-10-09

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

Last updated 2026-10-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-10 05:17 UTCPublished CVE record published
2026-10-09 16:17 UTCUpdated Record last modified

apache artemis UPGRADE

Affected: >= 1.0.0 and < 2.44.0 · >= 2.50.0 and < 2.57.0

Fixed in: 2.44.0, 2.57.0

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy artemis || rpm -q artemis || artemis --version

2. UPGRADE to 2.44.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade artemis

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade artemis

Note

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

3. If no update is available yet, DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison artemis sudo apt install artemis=<VERSION_BEFORE_1.0.0> sudo apt-mark hold artemis

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list artemis sudo dnf downgrade artemis-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add artemis

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora ELN · xfsdump · FIXED · 3.3.0-3.eln159 · FEDORA-2026-6e9bb3f901 · source

sudo dnf upgrade --advisory=FEDORA-2026-6e9bb3f901

Fedora 46 · fio · FIXED · 3.43-2.fc46 · FEDORA-2026-b36219886b · source

sudo dnf upgrade --advisory=FEDORA-2026-b36219886b

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: c0dem4sters/CVE-2026-57967 (1 stars)

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-2026-57967?

artemis: upgrade to 2.44.0, 2.57.0. Exact commands for each OS are on this page.

Is CVE-2026-57967 being exploited?

CVE-2026-57967 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-2026-57967 affect?

CVE-2026-57967 affects artemis. Severity is critical (CVSS 9.8). An unauthenticated remote attacker can craft a CORE protocol SESSION_REATTACH packet to steal an existing session and assume ongoing execution of the previously authenticated session. This issue affects Apache Artemis: from 2.50.0 throug

How urgent is CVE-2026-57967?

Priority 66/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Apache ActiveMQ vulnerabilities

Related CVEs

CVE-2026-75880 MEDIUM 6.5 UPGRADE An authenticated client could attach a consumer with a selector containing crafted wildcard usage that results
CVE-2026-49362 HIGH 7.5 UPGRADE An unauthenticated remote attacker can create arbitrary durable queues via the CORE protocol, leading to unaut
CVE-2026-49363 HIGH 7.5 UPGRADE An unauthenticated remote attacker connecting with the CORE protocol can discover cluster node details by send
CVE-2026-49364 CRITICAL 9.1 UPGRADE An unauthenticated network-adjacent attacker can leverage discovery to capture cluster administrative credenti
CVE-2026-57822 MEDIUM 6.5 UPGRADE When the broker is processing message-based management requests, sent by an authenticated messaging client tha

References

← Back to latest CVEs