Eclipse NetX Duo up to 6.5.2.202603a ICMPv6 Packet Too Big null pointer dereference

Summaryinfo

A vulnerability marked as critical has been reported in Eclipse NetX Duo up to 6.5.2.202603a. Affected by this issue is some unknown functionality of the component ICMPv6 Packet Too Big Handler. The manipulation leads to null pointer dereference. This vulnerability is documented as CVE-2026-114408. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Eclipse NetX Duo up to 6.5.2.202603a and classified as critical. This issue affects an unknown code of the component ICMPv6 Packet Too Big Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

In Eclipse ThreadX NetX Duo versions 6.4.5.202504 through 6.5.2.202603a, built with IPv6 path MTU discovery, the ICMPv6 Packet Too Big handler uses the destination-table entry it adds without checking that the add succeeded. A sender on the network can fill the destination table with Packet Too Big messages quoting new destinations, after which the next message makes the IP helper thread dereference a NULL pointer, crashing it on targets that fault on address 0 and stopping all network processing.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-114408 since 10/21/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

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

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Eclipse

Name

• NetX Duo

Version

• 6.5.2.202603a

License

• open-source

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion