Summaryinfo

A vulnerability categorized as problematic has been discovered in Undertow. This affects the function getParameterMap. The manipulation results in allocation of resources. This vulnerability was named CVE-2026-3260. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Undertow (affected version unknown). Affected is the function getParameterMap. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. CVE summarizes:

A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending an HTTP GET request containing multipart/form-data content. If the underlying application processes parameters using methods like `getParameterMap()`, the server prematurely parses and stores this content to disk. This could lead to resource exhaustion, potentially resulting in a Denial of Service (DoS).

The advisory is shared for download at access.redhat.com. This vulnerability is traded as CVE-2026-3260 since 02/26/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 303390 (Linux Distros Unpatched Vulnerability : CVE-2026-3260), which helps to determine the existence of the flaw in a target environment.

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

The vulnerability is also documented in the vulnerability database at Tenable (303390). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• Undertow

License

• free

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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