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.
CVE-2026-57220
“—” beside the score: it is equal to the CVSS score beside it.
This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (45th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-43018 (ENISA EUVD)Source: ENISA EUVD
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 65EG Risk 65/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.5%
- EPSS %ILE
- 45th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
- EG Likelihood
- 0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
July 10, 2026
Last Modified
October 25, 2026
Advisory Details (6)
Auto-updated Jul 10, 2026Stream listener does not enforce configured frame-size limit during authentication, permitting unauth'd mem-exhaust DoS · Advisory · rabbitmq/rabbitmq-server · GitHub
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-f364-87q5-j35qRabbitMQ 4.2.6
Patch available: rabbitmq/rabbitmq-server v4.2.6
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6Limit heap size for unauthenticated connections (backport #16171) (backport #16172)
Fix merged in rabbitmq/rabbitmq-server PR #16173 on 2026-04-16 — awaiting tagged release
https://github.com/rabbitmq/rabbitmq-server/pull/16173Limit heap size for unauthenticated connections
Fix merged in rabbitmq/rabbitmq-server PR #16171 on 2026-04-16 — awaiting tagged release
https://github.com/rabbitmq/rabbitmq-server/pull/16171commit 773a49c4921e (rabbitmq/rabbitmq-server)
Fix landed in rabbitmq/rabbitmq-server commit 773a49c4921e — awaiting tagged release
https://github.com/rabbitmq/rabbitmq-server/commit/773a49c4921e8be990262a2d609c35916825679ecommit 595ec28fa162 (rabbitmq/rabbitmq-server)
Fix landed in rabbitmq/rabbitmq-server commit 595ec28fa162 — awaiting tagged release
https://github.com/rabbitmq/rabbitmq-server/commit/595ec28fa1621b1f2c28124e4e0466a8ad963547Vendor Advisories for CVE-2026-57220(3)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- CVE-2026-57220Microsoft Security Response Center (MSRC)High
RabbitMQ: Stream listener does not enforce configured frame-size limit during authentication, permitting unauth'd mem-exhaust DoS
- RHSA-2026:35940Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
- RHSA-2026:35939Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Patch Availability(2)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| redhat | rabbitmq-server4-3-main-4.3.2-1.hum1 | 2026-07-06 | redhat |
| redhat | rabbitmq-server4-2-main-4.2.8-1.hum1 | 2026-07-06 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 45× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 100 of 251 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 151 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.5% · 45th percentile
- 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.5% · 45th percentile
- 2026-11-01 07:44 UTCEG score recompute
- 2026-11-01 07:44 UTCVendor advisory
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 45th percentile
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
- 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 45th percentile
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 45th percentile
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 45th percentile
- 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
- 2026-10-25 15:27 UTCVendor advisory
- 2026-10-25 14:17 UTCEG score recompute
- 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
- 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 45th percentile
- 2026-10-23 07:38 UTCEG score recompute
- 2026-10-23 07:38 UTCVendor advisory
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 45th percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-18 03:29 UTCEG score recompute
- 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 44th percentile
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- 2026-10-16 15:19 UTCEG score recompute
- 2026-10-16 15:19 UTCVendor advisory
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-12 15:54 UTCEG score recompute
- 2026-10-11 19:37 UTCEG score recompute
- 2026-10-11 16:52 UTCEG score recompute
- 2026-10-11 14:15 UTCEG score recompute
- 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-09 10:51 UTCEG score recompute
- 2026-10-09 10:51 UTCVendor advisory
- 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
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- 2026-10-01 14:57 UTCEG score recompute
- 2026-10-01 14:57 UTCVendor advisory
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-09-28 09:46 UTCEG score recompute
- 2026-09-28 09:46 UTCVendor advisory
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-09-24 14:04 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-09-24 11:09 UTCEG score recompute
- 2026-09-24 11:09 UTCVendor advisory
- 2026-09-23 17:54 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-09-23 05:44 UTCEG score recompute
- 2026-09-23 05:44 UTCVendor advisory
- 2026-09-20 20:16 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-09-18 05:17 UTCEG score recompute
- 2026-09-18 05:17 UTCVendor advisory
- 2026-09-17 19:31 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.0% · 59th percentile
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- 2026-09-14 11:17 UTCVendor advisory
- 2026-09-13 23:38 UTCEG score recompute
- 2026-09-13 23:38 UTCVendor advisory
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.0% · 59th percentile
- 2026-09-13 08:11 UTCEG score recompute
- 2026-09-13 08:11 UTCVendor advisory
- 2026-09-12 14:28 UTCVendor advisory
- 2026-09-12 02:49 UTCEG score recompute
- 2026-09-12 02:49 UTCVendor advisory
- 2026-09-11 14:53 UTCEPSS rescoreEPSS 1.0% · 59th percentile
- 2026-09-10 09:35 UTCEPSS rescoreEPSS 1.0% · 59th percentile
- 2026-09-08 22:01 UTCEPSS rescoreEPSS 1.0% · 59th percentile
- 2026-09-08 02:45 UTCEG score recompute
- 2026-09-08 02:45 UTCVendor advisory
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.0% · 59th percentile
- 2026-09-06 13:56 UTCEG score recompute
- 2026-09-06 13:56 UTCVendor advisory
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.0% · 59th percentile
- 2026-09-05 21:40 UTCEG score recompute
- 2026-09-05 21:40 UTCVendor advisory
- 2026-09-04 05:07 UTCEPSS rescoreEPSS 1.0% · 59th percentile
- 2026-09-02 14:12 UTCEPSS rescoreEPSS 1.0% · 59th percentile
- 2026-09-01 13:54 UTCEPSS rescoreEPSS 1.0% · 59th percentile
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- 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.0% · 59th percentile
- 2026-08-30 17:53 UTCVendor advisory
- 2026-08-30 06:14 UTCEG score recompute
- 2026-08-30 06:14 UTCVendor advisory
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 1.0% · 58th percentile
Related CVEs(same vendor + same CWE)
Same vendor
10 shownredhat:RHSA-2026:35939
Frequently asked(5)
What is CVE-2026-57220?
When was the CVE record for CVE-2026-57220 published?
Is CVE-2026-57220 actively exploited?
What is the CVSS score of CVE-2026-57220?
How do I remediate CVE-2026-57220?
Dependency Blast Radius
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