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NVD / CVE Program· CNA GitHub_M

CVE-2026-57220: RabbitMQ: Stream listener does not enforce configured frame-size limit during authentication, permitting unauth'd mem-exhaust DoS

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.54% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: rabbitmq rabbitmq-server 4.2.6; azl3 rabbitmq-server 3.13.7-6 on Azure Linux 3.0 3.13.7-7.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to rabbitmq rabbitmq-server 4.2.6; azl3 rabbitmq-server 3.13.7-6 on Azure Linux 3.0 3.13.7-7 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

RabbitMQ is a messaging and streaming broker. Prior to 4.2.6, the RabbitMQ stream listener does not enforce the configured stream frame-size limit while assembling frames during authentication and before Tune negotiation, allowing an unauthenticated remote client to declare oversized frame lengths and consume broker memory in rabbit_stream_core. This issue is fixed in version 4.2.6.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Jul 10, 2026
Updated
Oct 25, 2026
EPSS
0.5% · 46th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
proof of concept
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-57220

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
broadcomrabbitmq server

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • broadcom rabbitmq server4.2.0 and later · before 4.2.6

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • rabbitmq rabbitmq-server

    • >= 4.2.0, < 4.2.6affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
openSUSE:Leap 16.0rabbitmq-serverbefore 4.1.5-160000.2.14.1.5-160000.2.1
Red Hat:hummingbird:1rabbitmq-server4.2before 0:4.2.8-1.hum10:4.2.8-1.hum1
Red Hat:hummingbird:1rabbitmq-server4.3before 0:4.3.2-1.hum10:4.3.2-1.hum1
SUSE:Linux Enterprise Server 16.0rabbitmq-serverbefore 4.1.5-160000.2.14.1.5-160000.2.1

Same product

broadcom: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-57216RabbitMQ: AMQP 1.0, AMQP 0-9-1, Stream Protocol loopback enforcement can lead to remote guest sessions due to listener-address loopback checks
    40Plan
  • CVE-2026-57211RabbitMQ: UNC SSRF affecting the management UI on Windows
    40Plan
  • CVE-2016-9877An issue was discovered in Pivotal RabbitMQ 3.x before 3.5.8 and 3.6.x before 3.6.6 and RabbitMQ for PCF 1.5.x before 1.5.20, 1.6.x before 1
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-57218Jul 10, 2026 · RabbitMQ: AMQP 0-9-1 in combination with OAuth 2: consumer persistence can lead to post-revocation message disclosure
    19Monitor
  • ← EarlierCVE-2026-57219Jul 10, 2026 · RabbitMQ: Unauthenticated disclosure of OAuth client credentials via an HTTP API endpoint with certain less common OAuth 2 configurations
    35Monitor
  • Later →CVE-2026-57221Jul 10, 2026 · RabbitMQ: Passive queue/exchange declaration bypasses authorization checks, leaking queue metadata to unprivileged users
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
rabbitmq rabbitmq-server4.2.6 · descriptionVendor (CNA)
azl3 rabbitmq-server 3.13.7-6 on Azure Linux 3.03.13.7-7 · CBL-Mariner ReleasesMicrosoft (MSRC)
opensuse:rabbitmq-server4.1.5-160000.2.1 · openSUSE:Leap 16.0Package registry (OSV)
red hat:rabbitmq-server4.20:4.2.8-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:rabbitmq-server4.30:4.3.2-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
suse:rabbitmq-server4.1.5-160000.2.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-6607975 days apartRabbitMQ: Pre-auth AMQP 1.0 array32 zero-width element DoS
    32Monitor
  • CVE-2026-572120 days apartRabbitMQ management HTTP API accepts request bodies larger than configured max_http_body_size
    28Monitor
  • CVE-2026-6723575 days apartRabbitMQ: AMQP 0-9-1 body assembly never validates accumulated size
    28Monitor
  • CVE-2026-6722577 days apartRabbitMQ: Stream-protocol frame length never validated against frame_max
    25Monitor
  • CVE-2026-6723077 days apartRabbitMQ: Web-STOMP unbounded pre-auth accumulation
    25Monitor
  • CVE-2026-6721975 days apartRabbitMQ: Consistent-hash exchange unbounded weight
    24Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-770 · Allocation of Resources Without Limits or Throttling

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records