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Mallory
Critical

RabbitMQ auto-configuration with an SSL bundle disables TLS hostname verification

IdentifiersCVE-2026-40971CWE-297

Spring Boot's RabbitMQ auto-configuration fails to perform TLS hostname verification when the application is configured to use an SSL bundle for RabbitMQ connections. As a result, the client may establish a TLS connection to a RabbitMQ broker presenting a certificate that is otherwise trusted but whose subject does not match the intended broker hostname. The issue affects Spring Boot 4.0.0 through 4.0.5 and 3.5.0 through 3.5.13. Vendor-fixed versions are 4.0.6 and 3.5.14.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

The primary impact is exposure to man-in-the-middle or broker impersonation attacks. An attacker able to intercept traffic or present a fraudulent RabbitMQ endpoint with a trusted certificate could cause the application to connect to the wrong broker despite TLS being enabled. This can compromise the confidentiality and integrity of AMQP traffic, including message contents and connection-level interactions, and may allow message interception, modification, or redirection.

Mitigation

If you can’t patch tonight, do this now.

If immediate upgrade is not possible, reduce exposure by ensuring the RabbitMQ connection path cannot be intercepted, restricting broker access to trusted networks, and using compensating controls that enforce endpoint authenticity outside the affected auto-configuration path. Because the flaw is specifically missing hostname verification in the auto-configuration when using an SSL bundle, the reliable mitigation is to move to a fixed release.

Remediation

Patch, then assume compromise.

Upgrade Spring Boot to a fixed version. Per the vendor advisory, upgrade from 4.0.0-4.0.5 to 4.0.6 or later, or from 3.5.0-3.5.13 to 3.5.14 or later.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
BroadcomSpring Bootapplication
BroadcomSpring Boot Rabbitmqapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

What this page doesn’t show

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Exposure mapping

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Threat actor evidence

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Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity3

Community discussion across Reddit, Mastodon, and other social sources.