Spring Reactor Netty up to 1.0.52/1.2.18/1.3.6 DNS Resolver name resolution

Summaryinfo

A vulnerability categorized as problematic has been discovered in Spring Reactor Netty up to 1.0.52/1.2.18/1.3.6. Affected by this vulnerability is an unknown functionality of the component DNS Resolver. Executing a manipulation can lead to name resolution. This vulnerability is handled as CVE-2026-47843. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic was found in Spring Reactor Netty up to 1.0.52/1.2.18/1.3.6. This vulnerability affects an unknown functionality of the component DNS Resolver. The manipulation with an unknown input leads to a name resolution vulnerability. The CWE definition for the vulnerability is CWE-706. The product uses a name or reference to access a resource, but the name/reference resolves to a resource that is outside of the intended control sphere. As an impact it is known to affect integrity. CVE summarizes:

In specific scenarios involving multiple clients with different DNS resolver configurations, Reactor Netty may incorrectly reuse a previously configured DNS resolver. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier

The advisory is shared for download at spring.io. This vulnerability was named CVE-2026-47843 since 05/20/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/26/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• JavaScript Library

Vendor

• Spring

Name

• Reactor Netty

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6
• 1.0.7
• 1.0.8
• 1.0.9
• 1.0.10
• 1.0.11
• 1.0.12
• 1.0.13
• 1.0.14
• 1.0.15
• 1.0.16
• 1.0.17
• 1.0.18
• 1.0.19
• 1.0.20
• 1.0.21
• 1.0.22
• 1.0.23
• 1.0.24
• 1.0.25
• 1.0.26
• 1.0.27
• 1.0.28
• 1.0.29
• 1.0.30
• 1.0.31
• 1.0.32
• 1.0.33
• 1.0.34
• 1.0.35
• 1.0.36
• 1.0.37
• 1.0.38
• 1.0.39
• 1.0.40
• 1.0.41
• 1.0.42
• 1.0.43
• 1.0.44
• 1.0.45
• 1.0.46
• 1.0.47
• 1.0.48
• 1.0.49
• 1.0.50
• 1.0.51
• 1.0.52
• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4
• 1.2.5
• 1.2.6
• 1.2.7
• 1.2.8
• 1.2.9
• 1.2.10
• 1.2.11
• 1.2.12
• 1.2.13
• 1.2.14
• 1.2.15
• 1.2.16
• 1.2.17
• 1.2.18
• 1.3.0
• 1.3.1
• 1.3.2
• 1.3.3
• 1.3.4
• 1.3.5
• 1.3.6

CPE 2.3info

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Once again VulDB remains the best source for vulnerability data.

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